FFPROBE(1) FFPROBE(1) NAME ffprobe - ffprobe media prober SYNOPSIS The generic syntax is: ffprobe [options] [F<input_file>] DESCRIPTION ffprobe gathers information from multimedia streams and prints it in human- and machine-readable fashion. For example it can be used to check the format of the container used by a multimedia stream and the format and type of each media stream contained in it. If a filename is specified in input, ffprobe will try to open and probe the file content. If the file cannot be opened or recognized as a multimedia file, a positive exit code is returned. ffprobe may be employed both as a standalone application or in combination with a textual filter, which may perform more sophisticated processing, e.g. statistical processing or plotting. Options are used to list some of the formats supported by ffprobe or for specifying which information to display, and for setting how ffprobe will show it. ffprobe output is designed to be easily parsable by a textual filter, and consists of one or more sections of a form defined by the selected writer, which is specified by the print_format option. Metadata tags stored in the container or in the streams are recognized and printed in the corresponding "FORMAT" or "STREAM" section. OPTIONS All the numerical options, if not specified otherwise, accept in input a string representing a number, which may contain one of the International System number postfixes, for example 'K', 'M', 'G'. If 'i' is appended after the postfix, powers of 2 are used instead of powers of 10. The 'B' postfix multiplies the value for 8, and can be appended after another postfix or used alone. This allows using for example 'KB', 'MiB', 'G' and 'B' as postfix. Options which do not take arguments are boolean options, and set the corresponding value to true. They can be set to false by prefixing with "no" the option name, for example using "-nofoo" in the command line will set to false the boolean option with name "foo". Stream specifiers Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers are used to precisely specify which stream(s) does a given option belong to. A stream specifier is a string generally appended to the option name and separated from it by a colon. E.g. "-codec:a:1 ac3" option contains "a:1" stream specifier, which matches the second audio stream. Therefore it would select the ac3 codec for the second audio stream. A stream specifier can match several streams, the option is then applied to all of them. E.g. the stream specifier in "-b:a 128k" matches all audio streams. An empty stream specifier matches all streams, for example "-codec copy" or "-codec: copy" would copy all the streams without reencoding. Possible forms of stream specifiers are: stream_index Matches the stream with this index. E.g. "-threads:1 4" would set the thread count for the second stream to 4. stream_type[:stream_index] stream_type is one of: 'v' for video, 'a' for audio, 's' for subtitle, 'd' for data and 't' for attachments. If stream_index is given, then matches stream number stream_index of this type. Otherwise matches all streams of this type. p:program_id[:stream_index] If stream_index is given, then matches stream number stream_index in program with id program_id. Otherwise matches all streams in this program. #stream_id Matches the stream by format-specific ID. Generic options These options are shared amongst the av* tools. -L Show license. -h, -?, -help, --help [arg] Show help. An optional parameter may be specified to print help about a specific item. Possible values of arg are: decoder=decoder_name Print detailed information about the decoder named decoder_name. Use the -decoders option to get a list of all decoders. encoder=encoder_name Print detailed information about the encoder named encoder_name. Use the -encoders option to get a list of all encoders. demuxer=demuxer_name Print detailed information about the demuxer named demuxer_name. Use the -formats option to get a list of all demuxers and muxers. muxer=muxer_name Print detailed information about the muxer named muxer_name. Use the -formats option to get a list of all muxers and demuxers. -version Show version. -formats Show available formats. The fields preceding the format names have the following meanings: D Decoding available E Encoding available -codecs Show all codecs known to libavcodec. Note that the term 'codec' is used throughout this documentation as a shortcut for what is more correctly called a media bitstream format. -decoders Show available decoders. -encoders Show all available encoders. -bsfs Show available bitstream filters. -protocols Show available protocols. -filters Show available libavfilter filters. -pix_fmts Show available pixel formats. -sample_fmts Show available sample formats. -layouts Show channel names and standard channel layouts. -loglevel loglevel | -v loglevel Set the logging level used by the library. loglevel is a number or a string containing one of the following values: quiet panic fatal error warning info verbose debug By default the program logs to stderr, if coloring is supported by the terminal, colors are used to mark errors and warnings. Log coloring can be disabled setting the environment variable AV_LOG_FORCE_NOCOLOR or NO_COLOR, or can be forced setting the environment variable AV_LOG_FORCE_COLOR. The use of the environment variable NO_COLOR is deprecated and will be dropped in a following FFmpeg version. -report Dump full command line and console output to a file named "program-YYYYMMDD-HHMMSS.log" in the current directory. This file can be useful for bug reports. It also implies "-loglevel verbose". Note: setting the environment variable "FFREPORT" to any value has the same effect. -cpuflags flags (global) Allows setting and clearing cpu flags. This option is intended for testing. Do not use it unless you know what you're doing. ffmpeg -cpuflags -sse+mmx ... ffmpeg -cpuflags mmx ... ffmpeg -cpuflags 0 ... AVOptions These options are provided directly by the libavformat, libavdevice and libavcodec libraries. To see the list of available AVOptions, use the -help option. They are separated into two categories: generic These options can be set for any container, codec or device. Generic options are listed under AVFormatContext options for containers/devices and under AVCodecContext options for codecs. private These options are specific to the given container, device or codec. Private options are listed under their corresponding containers/devices/codecs. For example to write an ID3v2.3 header instead of a default ID3v2.4 to an MP3 file, use the id3v2_version private option of the MP3 muxer: ffmpeg -i input.flac -id3v2_version 3 out.mp3 All codec AVOptions are obviously per-stream, so the chapter on stream specifiers applies to them Note -nooption syntax cannot be used for boolean AVOptions, use -option 0/-option 1. Note2 old undocumented way of specifying per-stream AVOptions by prepending v/a/s to the options name is now obsolete and will be removed soon. Codec AVOptions -b[:stream_specifier] integer (output,audio,video) set bitrate (in bits/s) -ab[:stream_specifier] integer (output,audio) set bitrate (in bits/s) -bt[:stream_specifier] integer (output,video) Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. This is not related to min/max bitrate. Lowering tolerance too much has an adverse effect on quality. -flags[:stream_specifier] flags (input/output,audio,video,subtitles) Possible values: mv4 use four motion vector by macroblock (mpeg4) qpel use 1/4 pel motion compensation loop use loop filter qscale use fixed qscale gmc use gmc mv0 always try a mb with mv=<0,0> input_preserved pass1 use internal 2pass ratecontrol in first pass mode pass2 use internal 2pass ratecontrol in second pass mode gray only decode/encode grayscale emu_edge don't draw edges psnr error[?] variables will be set during encoding truncated naq normalize adaptive quantization ildct use interlaced dct low_delay force low delay global_header place global headers in extradata instead of every keyframe bitexact use only bitexact stuff (except (i)dct) aic h263 advanced intra coding / mpeg4 ac prediction cbp Deprecated, use mpegvideo private options instead qprd Deprecated, use mpegvideo private options instead ilme interlaced motion estimation cgop closed gop -sub_id[:stream_specifier] integer () -me_method[:stream_specifier] integer (output,video) set motion estimation method Possible values: zero zero motion estimation (fastest) full full motion estimation (slowest) epzs EPZS motion estimation (default) esa esa motion estimation (alias for full) tesa tesa motion estimation dia dia motion estimation (alias for epzs) log log motion estimation phods phods motion estimation x1 X1 motion estimation hex hex motion estimation umh umh motion estimation iter iter motion estimation -extradata_size[:stream_specifier] integer () -time_base[:stream_specifier] rational number () -g[:stream_specifier] integer (output,video) set the group of picture size -ar[:stream_specifier] integer (input/output,audio) set audio sampling rate (in Hz) -ac[:stream_specifier] integer (input/output,audio) set number of audio channels -cutoff[:stream_specifier] integer (output,audio) set cutoff bandwidth -frame_size[:stream_specifier] integer (output,audio) -frame_number[:stream_specifier] integer () -delay[:stream_specifier] integer () -qcomp[:stream_specifier] float (output,video) video quantizer scale compression (VBR). Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0 -qblur[:stream_specifier] float (output,video) video quantizer scale blur (VBR) -qmin[:stream_specifier] integer (output,video) min video quantizer scale (VBR) -qmax[:stream_specifier] integer (output,video) max video quantizer scale (VBR) -qdiff[:stream_specifier] integer (output,video) max difference between the quantizer scale (VBR) -bf[:stream_specifier] integer (output,video) use 'frames' B frames -b_qfactor[:stream_specifier] float (output,video) qp factor between p and b frames -rc_strategy[:stream_specifier] integer (output,video) ratecontrol method -b_strategy[:stream_specifier] integer (output,video) strategy to choose between I/P/B-frames -ps[:stream_specifier] integer (output,video) rtp payload size in bytes -mv_bits[:stream_specifier] integer () -header_bits[:stream_specifier] integer () -i_tex_bits[:stream_specifier] integer () -p_tex_bits[:stream_specifier] integer () -i_count[:stream_specifier] integer () -p_count[:stream_specifier] integer () -skip_count[:stream_specifier] integer () -misc_bits[:stream_specifier] integer () -frame_bits[:stream_specifier] integer () -codec_tag[:stream_specifier] integer () -bug[:stream_specifier] flags (input,video) workaround not auto detected encoder bugs Possible values: autodetect old_msmpeg4 some old lavc generated msmpeg4v3 files (no autodetection) xvid_ilace Xvid interlacing bug (autodetected if fourcc==XVIX) ump4 (autodetected if fourcc==UMP4) no_padding padding bug (autodetected) amv ac_vlc illegal vlc bug (autodetected per fourcc) qpel_chroma std_qpel old standard qpel (autodetected per fourcc/version) qpel_chroma2 direct_blocksize direct-qpel-blocksize bug (autodetected per fourcc/version) edge edge padding bug (autodetected per fourcc/version) hpel_chroma dc_clip ms workaround various bugs in microsofts broken decoders trunc trancated frames -lelim[:stream_specifier] integer (output,video) single coefficient elimination threshold for luminance (negative values also consider dc coefficient) -celim[:stream_specifier] integer (output,video) single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) -strict[:stream_specifier] integer (input/output,audio,video) how strictly to follow the standards Possible values: very strictly conform to a older more strict version of the spec or reference software strict strictly conform to all the things in the spec no matter what consequences normal unofficial allow unofficial extensions experimental allow non standardized experimental things -b_qoffset[:stream_specifier] float (output,video) qp offset between P and B frames -err_detect[:stream_specifier] flags (input,audio,video) set error detection flags Possible values: crccheck verify embedded CRCs bitstream detect bitstream specification deviations buffer detect improper bitstream length explode abort decoding on minor error detection careful consider things that violate the spec and have not been seen in the wild as errors compliant consider all spec non compliancies as errors aggressive consider things that a sane encoder should not do as an error -has_b_frames[:stream_specifier] integer () -block_align[:stream_specifier] integer () -mpeg_quant[:stream_specifier] integer (output,video) use MPEG quantizers instead of H.263 -stats_out[:stream_specifier] string () -qsquish[:stream_specifier] float (output,video) how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) -rc_qmod_amp[:stream_specifier] float (output,video) experimental quantizer modulation -rc_qmod_freq[:stream_specifier] integer (output,video) experimental quantizer modulation -rc_override_count[:stream_specifier] integer () -rc_eq[:stream_specifier] string (output,video) Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex. -maxrate[:stream_specifier] integer (output,audio,video) Set max bitrate tolerance (in bits/s). Requires bufsize to be set. -minrate[:stream_specifier] integer (output,audio,video) Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise. -bufsize[:stream_specifier] integer (output,audio,video) set ratecontrol buffer size (in bits) -rc_buf_aggressivity[:stream_specifier] float (output,video) currently useless -i_qfactor[:stream_specifier] float (output,video) qp factor between P and I frames -i_qoffset[:stream_specifier] float (output,video) qp offset between P and I frames -rc_init_cplx[:stream_specifier] float (output,video) initial complexity for 1-pass encoding -dct[:stream_specifier] integer (output,video) DCT algorithm Possible values: auto autoselect a good one (default) fastint fast integer int accurate integer mmx altivec faan floating point AAN DCT -lumi_mask[:stream_specifier] float (output,video) compresses bright areas stronger than medium ones -tcplx_mask[:stream_specifier] float (output,video) temporal complexity masking -scplx_mask[:stream_specifier] float (output,video) spatial complexity masking -p_mask[:stream_specifier] float (output,video) inter masking -dark_mask[:stream_specifier] float (output,video) compresses dark areas stronger than medium ones -idct[:stream_specifier] integer (input/output,video) select IDCT implementation Possible values: auto int simple simplemmx libmpeg2mmx mmi arm altivec sh4 simplearm simplearmv5te simplearmv6 simpleneon simplealpha h264 vp3 ipp xvidmmx faani floating point AAN IDCT -slice_count[:stream_specifier] integer () -ec[:stream_specifier] flags (input,video) set error concealment strategy Possible values: guess_mvs iterative motion vector (MV) search (slow) deblock use strong deblock filter for damaged MBs -bits_per_coded_sample[:stream_specifier] integer () -pred[:stream_specifier] integer (output,video) prediction method Possible values: left plane median -aspect[:stream_specifier] rational number (output,video) sample aspect ratio -debug[:stream_specifier] flags (input/output,audio,video,subtitles) print specific debug info Possible values: pict picture info rc rate control bitstream mb_type macroblock (MB) type qp per-block quantization parameter (QP) mv motion vector dct_coeff skip startcode pts er error recognition mmco memory management control operations (H.264) bugs vis_qp visualize quantization parameter (QP), lower QP are tinted greener vis_mb_type visualize block types buffers picture buffer allocations thread_ops threading operations -vismv[:stream_specifier] integer (input,video) visualize motion vectors (MVs) Possible values: pf forward predicted MVs of P-frames bf forward predicted MVs of B-frames bb backward predicted MVs of B-frames -cmp[:stream_specifier] integer (output,video) full pel me compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -subcmp[:stream_specifier] integer (output,video) sub pel me compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -mbcmp[:stream_specifier] integer (output,video) macroblock compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -ildctcmp[:stream_specifier] integer (output,video) interlaced dct compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -dia_size[:stream_specifier] integer (output,video) diamond type & size for motion estimation -last_pred[:stream_specifier] integer (output,video) amount of motion predictors from the previous frame -preme[:stream_specifier] integer (output,video) pre motion estimation -precmp[:stream_specifier] integer (output,video) pre motion estimation compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -pre_dia_size[:stream_specifier] integer (output,video) diamond type & size for motion estimation pre-pass -subq[:stream_specifier] integer (output,video) sub pel motion estimation quality -dtg_active_format[:stream_specifier] integer () -me_range[:stream_specifier] integer (output,video) limit motion vectors range (1023 for DivX player) -ibias[:stream_specifier] integer (output,video) intra quant bias -pbias[:stream_specifier] integer (output,video) inter quant bias -color_table_id[:stream_specifier] integer () -global_quality[:stream_specifier] integer (output,audio,video) -coder[:stream_specifier] integer (output,video) Possible values: vlc variable length coder / huffman coder ac arithmetic coder raw raw (no encoding) rle run-length coder deflate deflate-based coder -context[:stream_specifier] integer (output,video) context model -slice_flags[:stream_specifier] integer () -xvmc_acceleration[:stream_specifier] integer () -mbd[:stream_specifier] integer (output,video) macroblock decision algorithm (high quality mode) Possible values: simple use mbcmp (default) bits use fewest bits rd use best rate distortion -stream_codec_tag[:stream_specifier] integer () -sc_threshold[:stream_specifier] integer (output,video) scene change threshold -lmin[:stream_specifier] integer (output,video) min lagrange factor (VBR) -lmax[:stream_specifier] integer (output,video) max lagrange factor (VBR) -nr[:stream_specifier] integer (output,video) noise reduction -rc_init_occupancy[:stream_specifier] integer (output,video) number of bits which should be loaded into the rc buffer before decoding starts -inter_threshold[:stream_specifier] integer (output,video) -flags2[:stream_specifier] flags (input/output,audio,video) Possible values: fast allow non spec compliant speedup tricks sgop Deprecated, use mpegvideo private options instead noout skip bitstream encoding local_header place global headers at every keyframe instead of in extradata chunks Frame data might be split into multiple chunks showall Show all frames before the first keyframe skiprd Deprecated, use mpegvideo private options instead -error[:stream_specifier] integer (output,video) -qns[:stream_specifier] integer (output,video) deprecated, use mpegvideo private options instead -threads[:stream_specifier] integer (input/output,video) Possible values: auto detect a good number of threads -me_threshold[:stream_specifier] integer (output,video) motion estimaton threshold -mb_threshold[:stream_specifier] integer (output,video) macroblock threshold -dc[:stream_specifier] integer (output,video) intra_dc_precision -nssew[:stream_specifier] integer (output,video) nsse weight -skip_top[:stream_specifier] integer (input,video) number of macroblock rows at the top which are skipped -skip_bottom[:stream_specifier] integer (input,video) number of macroblock rows at the bottom which are skipped -profile[:stream_specifier] integer (output,audio,video) Possible values: unknown aac_main aac_low aac_ssr aac_ltp aac_he aac_he_v2 aac_ld aac_eld dts dts_es dts_96_24 dts_hd_hra dts_hd_ma -level[:stream_specifier] integer (output,audio,video) Possible values: unknown -lowres[:stream_specifier] integer (input,audio,video) decode at 1= 1/2, 2=1/4, 3=1/8 resolutions -skip_threshold[:stream_specifier] integer (output,video) frame skip threshold -skip_factor[:stream_specifier] integer (output,video) frame skip factor -skip_exp[:stream_specifier] integer (output,video) frame skip exponent -skipcmp[:stream_specifier] integer (output,video) frame skip compare function Possible values: sad sum of absolute differences, fast (default) sse sum of squared errors satd sum of absolute Hadamard transformed differences dct sum of absolute DCT transformed differences psnr sum of squared quantization errors (avoid, low quality) bit number of bits needed for the block rd rate distortion optimal, slow zero 0 vsad sum of absolute vertical differences vsse sum of squared vertical differences nsse noise preserving sum of squared differences w53 5/3 wavelet, only used in snow w97 9/7 wavelet, only used in snow dctmax chroma -border_mask[:stream_specifier] float (output,video) increases the quantizer for macroblocks close to borders -mblmin[:stream_specifier] integer (output,video) min macroblock lagrange factor (VBR) -mblmax[:stream_specifier] integer (output,video) max macroblock lagrange factor (VBR) -mepc[:stream_specifier] integer (output,video) motion estimation bitrate penalty compensation (1.0 = 256) -skip_loop_filter[:stream_specifier] integer (input,video) Possible values: none default noref bidir nokey all -skip_idct[:stream_specifier] integer (input,video) Possible values: none default noref bidir nokey all -skip_frame[:stream_specifier] integer (input,video) Possible values: none default noref bidir nokey all -bidir_refine[:stream_specifier] integer (output,video) refine the two motion vectors used in bidirectional macroblocks -brd_scale[:stream_specifier] integer (output,video) downscales frames for dynamic B-frame decision -keyint_min[:stream_specifier] integer (output,video) minimum interval between IDR-frames -refs[:stream_specifier] integer (output,video) reference frames to consider for motion compensation -chromaoffset[:stream_specifier] integer (output,video) chroma qp offset from luma -trellis[:stream_specifier] integer (output,audio,video) rate-distortion optimal quantization -sc_factor[:stream_specifier] integer (output,video) multiplied by qscale for each frame and added to scene_change_score -mv0_threshold[:stream_specifier] integer (output,video) -b_sensitivity[:stream_specifier] integer (output,video) adjusts sensitivity of b_frame_strategy 1 -compression_level[:stream_specifier] integer (output,audio,video) -min_prediction_order[:stream_specifier] integer (output,audio) -max_prediction_order[:stream_specifier] integer (output,audio) -timecode_frame_start[:stream_specifier] integer (output,video) GOP timecode frame start number, in non drop frame format -request_channels[:stream_specifier] integer (input,audio) set desired number of audio channels -bits_per_raw_sample[:stream_specifier] integer () -channel_layout[:stream_specifier] integer (input/output,audio) Possible values: -request_channel_layout[:stream_specifier] integer (input,audio) Possible values: -rc_max_vbv_use[:stream_specifier] float (output,video) -rc_min_vbv_use[:stream_specifier] float (output,video) -ticks_per_frame[:stream_specifier] integer (input/output,audio,video) -color_primaries[:stream_specifier] integer (input/output,video) -color_trc[:stream_specifier] integer (input/output,video) -colorspace[:stream_specifier] integer (input/output,video) -color_range[:stream_specifier] integer (input/output,video) -chroma_sample_location[:stream_specifier] integer (input/output,video) -log_level_offset[:stream_specifier] integer () set the log level offset -slices[:stream_specifier] integer (output,video) number of slices, used in parallelized encoding -thread_type[:stream_specifier] flags (input/output,video) select multithreading type Possible values: slice frame -audio_service_type[:stream_specifier] integer (output,audio) audio service type Possible values: ma Main Audio Service ef Effects vi Visually Impaired hi Hearing Impaired di Dialogue co Commentary em Emergency vo Voice Over ka Karaoke -request_sample_fmt[:stream_specifier] integer (input,audio) sample format audio decoders should prefer Possible values: u8 8-bit unsigned integer s16 16-bit signed integer s32 32-bit signed integer flt 32-bit float dbl 64-bit double u8p 8-bit unsigned integer planar s16p 16-bit signed integer planar s32p 32-bit signed integer planar fltp 32-bit float planar dblp 64-bit double planar -pkt_timebase[:stream_specifier] rational number () Format AVOptions -avioflags flags (input/output) Possible values: direct reduce buffering -probesize integer (input) set probing size -packetsize integer (output) set packet size -fflags flags (input/output) Possible values: ignidx ignore index genpts generate pts nofillin do not fill in missing values that can be exactly calculated noparse disable AVParsers, this needs nofillin too igndts ignore dts discardcorrupt discard corrupted frames sortdts try to interleave outputted packets by dts keepside dont merge side data latm enable RTP MP4A-LATM payload nobuffer reduce the latency introduced by optional buffering -analyzeduration integer (input) how many microseconds are analyzed to estimate duration -cryptokey hexadecimal string (input) decryption key -indexmem integer (input) max memory used for timestamp index (per stream) -rtbufsize integer (input) max memory used for buffering real-time frames -fdebug flags (input/output) print specific debug info Possible values: ts -max_delay integer (input/output) maximum muxing or demuxing delay in microseconds -fpsprobesize integer (input) number of frames used to probe fps -audio_preload integer (output) microseconds by which audio packets should be interleaved earlier -chunk_duration integer (output) microseconds for each chunk -chunk_size integer (output) size in bytes for each chunk -f_err_detect flags (input) set error detection flags (deprecated; use err_detect, save via avconv) Possible values: crccheck verify embedded CRCs bitstream detect bitstream specification deviations buffer detect improper bitstream length explode abort decoding on minor error detection careful consider things that violate the spec and have not been seen in the wild as errors compliant consider all spec non compliancies as errors aggressive consider things that a sane encoder shouldnt do as an error -err_detect flags (input) set error detection flags Possible values: crccheck verify embedded CRCs bitstream detect bitstream specification deviations buffer detect improper bitstream length explode abort decoding on minor error detection careful consider things that violate the spec and have not been seen in the wild as errors compliant consider all spec non compliancies as errors aggressive consider things that a sane encoder shouldnt do as an error -use_wallclock_as_timestamps integer (input) use wallclock as timestamps -avoid_negative_ts integer (output) avoid negative timestamps Main options -f format Force format to use. -unit Show the unit of the displayed values. -prefix Use SI prefixes for the displayed values. Unless the "-byte_binary_prefix" option is used all the prefixes are decimal. -byte_binary_prefix Force the use of binary prefixes for byte values. -sexagesimal Use sexagesimal format HH:MM:SS.MICROSECONDS for time values. -pretty Prettify the format of the displayed values, it corresponds to the options "-unit -prefix -byte_binary_prefix -sexagesimal". -of, -print_format writer_name[=writer_options] Set the output printing format. writer_name specifies the name of the writer, and writer_options specifies the options to be passed to the writer. For example for printing the output in JSON format, specify: -print_format json For more details on the available output printing formats, see the Writers section below. -show_data Show payload data, as an hexadecimal and ASCII dump. Coupled with -show_packets, it will dump the packets' data. Coupled with -show_streams, it will dump the codec extradata. The dump is printed as the "data" field. It may contain newlines. -show_error Show information about the error found when trying to probe the input. The error information is printed within a section with name "ERROR". -show_format Show information about the container format of the input multimedia stream. All the container format information is printed within a section with name "FORMAT". -show_format_entry name Like -show_format, but only prints the specified entry of the container format information, rather than all. This option may be given more than once, then all specified entries will be shown. -show_packets Show information about each packet contained in the input multimedia stream. The information for each single packet is printed within a dedicated section with name "PACKET". -show_frames Show information about each frame contained in the input multimedia stream. The information for each single frame is printed within a dedicated section with name "FRAME". -show_streams Show information about each media stream contained in the input multimedia stream. Each media stream information is printed within a dedicated section with name "STREAM". -count_frames Count the number of frames per stream and report it in the corresponding stream section. -count_packets Count the number of packets per stream and report it in the corresponding stream section. -show_private_data, -private Show private data, that is data depending on the format of the particular shown element. This option is enabled by default, but you may need to disable it for specific uses, for example when creating XSD-compliant XML output. -show_program_version Show information related to program version. Version information is printed within a section with name "PROGRAM_VERSION". -show_library_versions Show information related to library versions. Version information for each library is printed within a section with name "LIBRARY_VERSION". -show_versions Show information related to program and library versions. This is the equivalent of setting both -show_program_version and -show_library_versions options. -bitexact Force bitexact output, useful to produce output which is not dependent on the specific build. -i input_file Read input_file. WRITERS A writer defines the output format adopted by ffprobe, and will be used for printing all the parts of the output. A writer may accept one or more arguments, which specify the options to adopt. A description of the currently available writers follows. default Default format. Print each section in the form: [SECTION] key1=val1 ... keyN=valN [/SECTION] Metadata tags are printed as a line in the corresponding FORMAT or STREAM section, and are prefixed by the string "TAG:". This writer accepts options as a list of key=value pairs, separated by ":". A description of the accepted options follows. nokey, nk If set to 1 specify not to print the key of each field. Default value is 0. noprint_wrappers, nw If set to 1 specify not to print the section header and footer. Default value is 0. compact, csv Compact and CSV format. The "csv" writer is equivalent to "compact", but supports different defaults. Each section is printed on a single line. If no option is specifid, the output has the form: section|key1=val1| ... |keyN=valN Metadata tags are printed in the corresponding "format" or "stream" section. A metadata tag key, if printed, is prefixed by the string "tag:". This writer accepts options as a list of key=value pairs, separated by ":". The description of the accepted options follows. item_sep, s Specify the character to use for separating fields in the output line. It must be a single printable character, it is "|" by default ("," for the "csv" writer). nokey, nk If set to 1 specify not to print the key of each field. Its default value is 0 (1 for the "csv" writer). escape, e Set the escape mode to use, default to "c" ("csv" for the "csv" writer). It can assume one of the following values: c Perform C-like escaping. Strings containing a newline ('\n'), carriage return ('\r'), a tab ('\t'), a form feed ('\f'), the escaping character ('\') or the item separator character SEP are escaped using C-like fashioned escaping, so that a newline is converted to the sequence "\n", a carriage return to "\r", '\' to "\\" and the separator SEP is converted to "\SEP". csv Perform CSV-like escaping, as described in RFC4180. Strings containing a newline ('\n'), a carriage return ('\r'), a double quote ('"'), or SEP are enclosed in double-quotes. none Perform no escaping. print_section, p Print the section name at the begin of each line if the value is 1, disable it with value set to 0. Default value is 1. flat Flat format. A free-form output where each line contains an explicit key=value, such as "streams.stream.3.tags.foo=bar". The output is shell escaped, so it can be directly embedded in sh scripts as long as the separator character is an alphanumeric character or an underscore (see sep_char option). This writer accepts options as a list of key=value pairs, separated by ":". The description of the accepted options follows. sep_char, s Separator character used to separate the chapter, the section name, IDs and potential tags in the printed field key. Default value is '.'. hierarchical, h Specify if the section name specification should be hierarchical. If set to 1, and if there is more than one section in the current chapter, the section name will be prefixed by the name of the chapter. A value of 0 will disable this behavior. Default value is 1. ini INI format output. Print output in an INI based format. The following conventions are adopted: · all key and values are UTF-8 · '.' is the subgroup separator · newline, '\t', '\f', '\b' and the following characters are escaped · '\' is the escape character · '#' is the comment indicator · '=' is the key/value separator · ':' is not used but usually parsed as key/value separator This writer accepts options as a list of key=value pairs, separated by ":". The description of the accepted options follows. hierarchical, h Specify if the section name specification should be hierarchical. If set to 1, and if there is more than one section in the current chapter, the section name will be prefixed by the name of the chapter. A value of 0 will disable this behavior. Default value is 1. json JSON based format. Each section is printed using JSON notation. This writer accepts options as a list of key=value pairs, separated by ":". The description of the accepted options follows. compact, c If set to 1 enable compact output, that is each section will be printed on a single line. Default value is 0. For more information about JSON, see <http://www.json.org/>. xml XML based format. The XML output is described in the XML schema description file ffprobe.xsd installed in the FFmpeg datadir. An updated version of the schema can be retrieved at the url <http://www.ffmpeg.org/schema/ffprobe.xsd>, which redirects to the latest schema committed into the FFmpeg development source code tree. Note that the output issued will be compliant to the ffprobe.xsd schema only when no special global output options (unit, prefix, byte_binary_prefix, sexagesimal etc.) are specified. This writer accepts options as a list of key=value pairs, separated by ":". The description of the accepted options follows. fully_qualified, q If set to 1 specify if the output should be fully qualified. Default value is 0. This is required for generating an XML file which can be validated through an XSD file. xsd_compliant, x If set to 1 perform more checks for ensuring that the output is XSD compliant. Default value is 0. This option automatically sets fully_qualified to 1. For more information about the XML format, see <http://www.w3.org/XML/>. TIMECODE ffprobe supports Timecode extraction: · MPEG1/2 timecode is extracted from the GOP, and is available in the video stream details (-show_streams, see timecode). · MOV timecode is extracted from tmcd track, so is available in the tmcd stream metadata (-show_streams, see TAG:timecode). · DV, GXF and AVI timecodes are available in format metadata (-show_format, see TAG:timecode). SYNTAX When evaluating specific formats, FFmpeg uses internal library parsing functions, shared by the tools. This section documents the syntax of some of these formats. Date The accepted syntax is: [(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z] now If the value is "now" it takes the current time. Time is local time unless Z is appended, in which case it is interpreted as UTC. If the year-month-day part is not specified it takes the current year-month-day. Time duration The accepted syntax is: [-]HH:MM:SS[.m...] [-]S+[.m...] HH expresses the number of hours, MM the number a of minutes and SS the number of seconds. Video size Specify the size of the sourced video, it may be a string of the form widthxheight, or the name of a size abbreviation. The following abbreviations are recognized: sqcif 128x96 qcif 176x144 cif 352x288 4cif 704x576 16cif 1408x1152 qqvga 160x120 qvga 320x240 vga 640x480 svga 800x600 xga 1024x768 uxga 1600x1200 qxga 2048x1536 sxga 1280x1024 qsxga 2560x2048 hsxga 5120x4096 wvga 852x480 wxga 1366x768 wsxga 1600x1024 wuxga 1920x1200 woxga 2560x1600 wqsxga 3200x2048 wquxga 3840x2400 whsxga 6400x4096 whuxga 7680x4800 cga 320x200 ega 640x350 hd480 852x480 hd720 1280x720 hd1080 1920x1080 Video rate Specify the frame rate of a video, expressed as the number of frames generated per second. It has to be a string in the format frame_rate_num/frame_rate_den, an integer number, a float number or a valid video frame rate abbreviation. The following abbreviations are recognized: ntsc 30000/1001 pal 25/1 qntsc 30000/1 qpal 25/1 sntsc 30000/1 spal 25/1 film 24/1 ntsc-film 24000/1 Ratio A ratio can be expressed as an expression, or in the form numerator:denominator. Note that a ratio with infinite (1/0) or negative value is considered valid, so you should check on the returned value if you want to exclude those values. The undefined value can be expressed using the "0:0" string. Color It can be the name of a color (case insensitive match) or a [0x|#]RRGGBB[AA] sequence, possibly followed by "@" and a string representing the alpha component. The alpha component may be a string composed by "0x" followed by an hexadecimal number or a decimal number between 0.0 and 1.0, which represents the opacity value (0x00/0.0 means completely transparent, 0xff/1.0 completely opaque). If the alpha component is not specified then 0xff is assumed. The string "random" will result in a random color. DECODERS Decoders are configured elements in FFmpeg which allow the decoding of multimedia streams. When you configure your FFmpeg build, all the supported native decoders are enabled by default. Decoders requiring an external library must be enabled manually via the corresponding "--enable-lib" option. You can list all available decoders using the configure option "--list-decoders". You can disable all the decoders with the configure option "--disable-decoders" and selectively enable / disable single decoders with the options "--enable-decoder=DECODER" / "--disable-decoder=DECODER". The option "-codecs" of the ff* tools will display the list of enabled decoders. VIDEO DECODERS A description of some of the currently available video decoders follows. rawvideo Raw video decoder. This decoder decodes rawvideo streams. Options top top_field_first Specify the assumed field type of the input video. -1 the video is assumed to be progressive (default) 0 bottom-field-first is assumed 1 top-field-first is assumed AUDIO DECODERS ffwavesynth Internal wave synthetizer. This decoder generates wave patterns according to predefined sequences. Its use is purely internal and the format of the data it accepts is not publicly documented. libcelt libcelt decoder wrapper libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio codec. Requires the presence of the libcelt headers and library during configuration. You need to explicitly configure the build with "--enable-libcelt". libgsm libgsm decoder wrapper libgsm allows libavcodec to decode the GSM full rate audio codec. Requires the presence of the libgsm headers and library during configuration. You need to explicitly configure the build with "--enable-libgsm". This decoder supports both the ordinary GSM and the Microsoft variant. libilbc libilbc decoder wrapper libilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC) audio codec. Requires the presence of the libilbc headers and library during configuration. You need to explicitly configure the build with "--enable-libilbc". Options The following option is supported by the libilbc wrapper. enhance Enable the enhancement of the decoded audio when set to 1. The default value is 0 (disabled). libopencore-amrnb libopencore-amrnb decoder wrapper libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate Narrowband audio codec. Using it requires the presence of the libopencore-amrnb headers and library during configuration. You need to explicitly configure the build with "--enable-libopencore-amrnb". An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB without this library. libopencore-amrwb libopencore-amrwb decoder wrapper. libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate Wideband audio codec. Using it requires the presence of the libopencore- amrwb headers and library during configuration. You need to explicitly configure the build with "--enable-libopencore-amrwb". An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB without this library. DEMUXERS Demuxers are configured elements in FFmpeg which allow to read the multimedia streams from a particular type of file. When you configure your FFmpeg build, all the supported demuxers are enabled by default. You can list all available ones using the configure option "--list-demuxers". You can disable all the demuxers using the configure option "--disable-demuxers", and selectively enable a single demuxer with the option "--enable-demuxer=DEMUXER", or disable it with the option "--disable-demuxer=DEMUXER". The option "-formats" of the ff* tools will display the list of enabled demuxers. The description of some of the currently available demuxers follows. image2 Image file demuxer. This demuxer reads from a list of image files specified by a pattern. The syntax and meaning of the pattern is specified by the option pattern_type. The pattern may contain a suffix which is used to automatically determine the format of the images contained in the files. The size, the pixel format, and the format of each image must be the same for all the files in the sequence. This demuxer accepts the following options: framerate Set the framerate for the video stream. It defaults to 25. loop If set to 1, loop over the input. Default value is 0. pattern_type Select the pattern type used to interpret the provided filename. pattern_type accepts one of the following values. sequence Select a sequence pattern type, used to specify a sequence of files indexed by sequential numbers. A sequence pattern may contain the string "%d" or "%0Nd", which specifies the position of the characters representing a sequential number in each filename matched by the pattern. If the form "%d0Nd" is used, the string representing the number in each filename is 0-padded and N is the total number of 0-padded digits representing the number. The literal character '%' can be specified in the pattern with the string "%%". If the sequence pattern contains "%d" or "%0Nd", the first filename of the file list specified by the pattern must contain a number inclusively contained between start_number and start_number+start_number_range-1, and all the following numbers must be sequential. For example the pattern "img-%03d.bmp" will match a sequence of filenames of the form img-001.bmp, img-002.bmp, ..., img-010.bmp, etc.; the pattern "i%%m%%g-%d.jpg" will match a sequence of filenames of the form i%m%g-1.jpg, i%m%g-2.jpg, ..., i%m%g-10.jpg, etc. Note that the pattern must not necessarily contain "%d" or "%0Nd", for example to convert a single image file img.jpeg you can employ the command: ffmpeg -i img.jpeg img.png glob Select a glob wildcard pattern type. The pattern is interpreted like a "glob()" pattern. This is only selectable if libavformat was compiled with globbing support. glob_sequence (deprecated, will be removed) Select a mixed glob wildcard/sequence pattern. If your version of libavformat was compiled with globbing support, and the provided pattern contains at least one glob meta character among "%*?[]{}" that is preceded by an unescaped "%", the pattern is interpreted like a "glob()" pattern, otherwise it is interpreted like a sequence pattern. All glob special characters "%*?[]{}" must be prefixed with "%". To escape a literal "%" you shall use "%%". For example the pattern "foo-%*.jpeg" will match all the filenames prefixed by "foo-" and terminating with ".jpeg", and "foo-%?%?%?.jpeg" will match all the filenames prefixed with "foo-", followed by a sequence of three characters, and terminating with ".jpeg". This pattern type is deprecated in favor of glob and sequence. Default value is glob_sequence. pixel_format Set the pixel format of the images to read. If not specified the pixel format is guessed from the first image file in the sequence. start_number Set the index of the file matched by the image file pattern to start to read from. Default value is 0. start_number_range Set the index interval range to check when looking for the first image file in the sequence, starting from start_number. Default value is 5. video_size Set the video size of the images to read. If not specified the video size is guessed from the first image file in the sequence. Examples · Use ffmpeg for creating a video from the images in the file sequence img-001.jpeg, img-002.jpeg, ..., assuming an input frame rate of 10 frames per second: ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv · As above, but start by reading from a file with index 100 in the sequence: ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv · Read images matching the "*.png" glob pattern , that is all the files terminating with the ".png" suffix: ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv applehttp Apple HTTP Live Streaming demuxer. This demuxer presents all AVStreams from all variant streams. The id field is set to the bitrate variant index number. By setting the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay), the caller can decide which variant streams to actually receive. The total bitrate of the variant that the stream belongs to is available in a metadata key named "variant_bitrate". sbg SBaGen script demuxer. This demuxer reads the script language used by SBaGen <http://uazu.net/sbagen/> to generate binaural beats sessions.  If the script uses either only absolute timestamps (including the script start time) or only relative ones, then its layout is fixed, and the conversion is straightforward. On the other hand, if the script mixes both kind of timestamps, then the NOW reference for relative timestamps will be taken from the current time of day at the time the script is read, and the script layout will be frozen according to that reference. That means that if the script is directly played, the actual times will match the absolute timestamps up to the sound controller's clock accuracy, but if the user somehow pauses the playback or seeks, all times will be shifted accordingly. PROTOCOLS Protocols are configured elements in FFmpeg which allow to access resources which require the use of a particular protocol. When you configure your FFmpeg build, all the supported protocols are enabled by default. You can list all available ones using the configure option "--list-protocols". You can disable all the protocols using the configure option "--disable-protocols", and selectively enable a protocol using the option "--enable-protocol=PROTOCOL", or you can disable a particular protocol using the option "--disable-protocol=PROTOCOL". The option "-protocols" of the ff* tools will display the list of supported protocols. A description of the currently available protocols follows. bluray Read BluRay playlist. The accepted options are: angle BluRay angle chapter Start chapter (1...N) playlist Playlist to read (BDMV/PLAYLIST/?????.mpls) Examples: Read longest playlist from BluRay mounted to /mnt/bluray: bluray:/mnt/bluray Read angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start from chapter 2: -playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray concat Physical concatenation protocol. Allow to read and seek from many resource in sequence as if they were a unique resource. A URL accepted by this protocol has the syntax: concat:<URL1>|<URL2>|...|<URLN> where URL1, URL2, ..., URLN are the urls of the resource to be concatenated, each one possibly specifying a distinct protocol. For example to read a sequence of files split1.mpeg, split2.mpeg, split3.mpeg with ffplay use the command: ffplay concat:split1.mpeg\|split2.mpeg\|split3.mpeg Note that you may need to escape the character "|" which is special for many shells. file File access protocol. Allow to read from or read to a file. For example to read from a file input.mpeg with ffmpeg use the command: ffmpeg -i file:input.mpeg output.mpeg The ff* tools default to the file protocol, that is a resource specified with the name "FILE.mpeg" is interpreted as the URL "file:FILE.mpeg". gopher Gopher protocol. hls Read Apple HTTP Live Streaming compliant segmented stream as a uniform one. The M3U8 playlists describing the segments can be remote HTTP resources or local files, accessed using the standard file protocol. The nested protocol is declared by specifying "+proto" after the hls URI scheme name, where proto is either "file" or "http". hls+http://host/path/to/remote/resource.m3u8 hls+file://path/to/local/resource.m3u8 Using this protocol is discouraged - the hls demuxer should work just as well (if not, please report the issues) and is more complete. To use the hls demuxer instead, simply use the direct URLs to the m3u8 files. http HTTP (Hyper Text Transfer Protocol). mmst MMS (Microsoft Media Server) protocol over TCP. mmsh MMS (Microsoft Media Server) protocol over HTTP. The required syntax is: mmsh://<server>[:<port>][/<app>][/<playpath>] md5 MD5 output protocol. Computes the MD5 hash of the data to be written, and on close writes this to the designated output or stdout if none is specified. It can be used to test muxers without writing an actual file. Some examples follow. # Write the MD5 hash of the encoded AVI file to the file output.avi.md5. ffmpeg -i input.flv -f avi -y md5:output.avi.md5 # Write the MD5 hash of the encoded AVI file to stdout. ffmpeg -i input.flv -f avi -y md5: Note that some formats (typically MOV) require the output protocol to be seekable, so they will fail with the MD5 output protocol. pipe UNIX pipe access protocol. Allow to read and write from UNIX pipes. The accepted syntax is: pipe:[<number>] number is the number corresponding to the file descriptor of the pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr). If number is not specified, by default the stdout file descriptor will be used for writing, stdin for reading. For example to read from stdin with ffmpeg: cat test.wav | ffmpeg -i pipe:0 # ...this is the same as... cat test.wav | ffmpeg -i pipe: For writing to stdout with ffmpeg: ffmpeg -i test.wav -f avi pipe:1 | cat > test.avi # ...this is the same as... ffmpeg -i test.wav -f avi pipe: | cat > test.avi Note that some formats (typically MOV), require the output protocol to be seekable, so they will fail with the pipe output protocol. rtmp Real-Time Messaging Protocol. The Real-Time Messaging Protocol (RTMP) is used for streaming multimedia content across a TCP/IP network. The required syntax is: rtmp://<server>[:<port>][/<app>][/<instance>][/<playpath>] The accepted parameters are: server The address of the RTMP server. port The number of the TCP port to use (by default is 1935). app It is the name of the application to access. It usually corresponds to the path where the application is installed on the RTMP server (e.g. /ondemand/, /flash/live/, etc.). You can override the value parsed from the URI through the "rtmp_app" option, too. playpath It is the path or name of the resource to play with reference to the application specified in app, may be prefixed by "mp4:". You can override the value parsed from the URI through the "rtmp_playpath" option, too. listen Act as a server, listening for an incoming connection. timeout Maximum time to wait for the incoming connection. Implies listen. Additionally, the following parameters can be set via command line options (or in code via "AVOption"s): rtmp_app Name of application to connect on the RTMP server. This option overrides the parameter specified in the URI. rtmp_buffer Set the client buffer time in milliseconds. The default is 3000. rtmp_conn Extra arbitrary AMF connection parameters, parsed from a string, e.g. like "B:1 S:authMe O:1 NN:code:1.23 NS:flag:ok O:0". Each value is prefixed by a single character denoting the type, B for Boolean, N for number, S for string, O for object, or Z for null, followed by a colon. For Booleans the data must be either 0 or 1 for FALSE or TRUE, respectively. Likewise for Objects the data must be 0 or 1 to end or begin an object, respectively. Data items in subobjects may be named, by prefixing the type with 'N' and specifying the name before the value (i.e. "NB:myFlag:1"). This option may be used multiple times to construct arbitrary AMF sequences. rtmp_flashver Version of the Flash plugin used to run the SWF player. The default is LNX 9,0,124,2. rtmp_flush_interval Number of packets flushed in the same request (RTMPT only). The default is 10. rtmp_live Specify that the media is a live stream. No resuming or seeking in live streams is possible. The default value is "any", which means the subscriber first tries to play the live stream specified in the playpath. If a live stream of that name is not found, it plays the recorded stream. The other possible values are "live" and "recorded". rtmp_pageurl URL of the web page in which the media was embedded. By default no value will be sent. rtmp_playpath Stream identifier to play or to publish. This option overrides the parameter specified in the URI. rtmp_subscribe Name of live stream to subscribe to. By default no value will be sent. It is only sent if the option is specified or if rtmp_live is set to live. rtmp_swfhash SHA256 hash of the decompressed SWF file (32 bytes). rtmp_swfsize Size of the decompressed SWF file, required for SWFVerification. rtmp_swfurl URL of the SWF player for the media. By default no value will be sent. rtmp_swfverify URL to player swf file, compute hash/size automatically. rtmp_tcurl URL of the target stream. Defaults to proto://host[:port]/app. For example to read with ffplay a multimedia resource named "sample" from the application "vod" from an RTMP server "myserver": ffplay rtmp://myserver/vod/sample rtmpe Encrypted Real-Time Messaging Protocol. The Encrypted Real-Time Messaging Protocol (RTMPE) is used for streaming multimedia content within standard cryptographic primitives, consisting of Diffie-Hellman key exchange and HMACSHA256, generating a pair of RC4 keys. rtmps Real-Time Messaging Protocol over a secure SSL connection. The Real-Time Messaging Protocol (RTMPS) is used for streaming multimedia content across an encrypted connection. rtmpt Real-Time Messaging Protocol tunneled through HTTP. The Real-Time Messaging Protocol tunneled through HTTP (RTMPT) is used for streaming multimedia content within HTTP requests to traverse firewalls. rtmpte Encrypted Real-Time Messaging Protocol tunneled through HTTP. The Encrypted Real-Time Messaging Protocol tunneled through HTTP (RTMPTE) is used for streaming multimedia content within HTTP requests to traverse firewalls. rtmpts Real-Time Messaging Protocol tunneled through HTTPS. The Real-Time Messaging Protocol tunneled through HTTPS (RTMPTS) is used for streaming multimedia content within HTTPS requests to traverse firewalls. rtmp, rtmpe, rtmps, rtmpt, rtmpte Real-Time Messaging Protocol and its variants supported through librtmp. Requires the presence of the librtmp headers and library during configuration. You need to explicitly configure the build with "--enable-librtmp". If enabled this will replace the native RTMP protocol. This protocol provides most client functions and a few server functions needed to support RTMP, RTMP tunneled in HTTP (RTMPT), encrypted RTMP (RTMPE), RTMP over SSL/TLS (RTMPS) and tunneled variants of these encrypted types (RTMPTE, RTMPTS). The required syntax is: <rtmp_proto>://<server>[:<port>][/<app>][/<playpath>] <options> where rtmp_proto is one of the strings "rtmp", "rtmpt", "rtmpe", "rtmps", "rtmpte", "rtmpts" corresponding to each RTMP variant, and server, port, app and playpath have the same meaning as specified for the RTMP native protocol. options contains a list of space-separated options of the form key=val. See the librtmp manual page (man 3 librtmp) for more information. For example, to stream a file in real-time to an RTMP server using ffmpeg: ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream To play the same stream using ffplay: ffplay "rtmp://myserver/live/mystream live=1" rtp Real-Time Protocol. rtsp RTSP is not technically a protocol handler in libavformat, it is a demuxer and muxer. The demuxer supports both normal RTSP (with data transferred over RTP; this is used by e.g. Apple and Microsoft) and Real- RTSP (with data transferred over RDT). The muxer can be used to send a stream using RTSP ANNOUNCE to a server supporting it (currently Darwin Streaming Server and Mischa Spiegelmock's <http://github.com/revmischa/rtsp-server>). The required syntax for a RTSP url is: rtsp://<hostname>[:<port>]/<path> The following options (set on the ffmpeg/ffplay command line, or set in code via "AVOption"s or in "avformat_open_input"), are supported: Flags for "rtsp_transport": udp Use UDP as lower transport protocol. tcp Use TCP (interleaving within the RTSP control channel) as lower transport protocol. udp_multicast Use UDP multicast as lower transport protocol. http Use HTTP tunneling as lower transport protocol, which is useful for passing proxies. Multiple lower transport protocols may be specified, in that case they are tried one at a time (if the setup of one fails, the next one is tried). For the muxer, only the "tcp" and "udp" options are supported. Flags for "rtsp_flags": filter_src Accept packets only from negotiated peer address and port. listen Act as a server, listening for an incoming connection. When receiving data over UDP, the demuxer tries to reorder received packets (since they may arrive out of order, or packets may get lost totally). This can be disabled by setting the maximum demuxing delay to zero (via the "max_delay" field of AVFormatContext). When watching multi-bitrate Real-RTSP streams with ffplay, the streams to display can be chosen with "-vst" n and "-ast" n for video and audio respectively, and can be switched on the fly by pressing "v" and "a". Example command lines: To watch a stream over UDP, with a max reordering delay of 0.5 seconds: ffplay -max_delay 500000 -rtsp_transport udp rtsp://server/video.mp4 To watch a stream tunneled over HTTP: ffplay -rtsp_transport http rtsp://server/video.mp4 To send a stream in realtime to a RTSP server, for others to watch: ffmpeg -re -i <input> -f rtsp -muxdelay 0.1 rtsp://server/live.sdp To receive a stream in realtime: ffmpeg -rtsp_flags listen -i rtsp://ownaddress/live.sdp <output> sap Session Announcement Protocol (RFC 2974). This is not technically a protocol handler in libavformat, it is a muxer and demuxer. It is used for signalling of RTP streams, by announcing the SDP for the streams regularly on a separate port. Muxer The syntax for a SAP url given to the muxer is: sap://<destination>[:<port>][?<options>] The RTP packets are sent to destination on port port, or to port 5004 if no port is specified. options is a "&"-separated list. The following options are supported: announce_addr=address Specify the destination IP address for sending the announcements to. If omitted, the announcements are sent to the commonly used SAP announcement multicast address <IP_ADDRESS> (sap.mcast.net), or ff0e::2:7ffe if destination is an IPv6 address. announce_port=port Specify the port to send the announcements on, defaults to 9875 if not specified. ttl=ttl Specify the time to live value for the announcements and RTP packets, defaults to 255. same_port=0|1 If set to 1, send all RTP streams on the same port pair. If zero (the default), all streams are sent on unique ports, with each stream on a port 2 numbers higher than the previous. VLC/Live555 requires this to be set to 1, to be able to receive the stream. The RTP stack in libavformat for receiving requires all streams to be sent on unique ports. Example command lines follow. To broadcast a stream on the local subnet, for watching in VLC: ffmpeg -re -i <input> -f sap sap://<IP_ADDRESS>?same_port=1 Similarly, for watching in ffplay: ffmpeg -re -i <input> -f sap sap://<IP_ADDRESS> And for watching in ffplay, over IPv6: ffmpeg -re -i <input> -f sap sap://[ff0e::1:2:3:4] Demuxer The syntax for a SAP url given to the demuxer is: sap://[<address>][:<port>] address is the multicast address to listen for announcements on, if omitted, the default <IP_ADDRESS> (sap.mcast.net) is used. port is the port that is listened on, 9875 if omitted. The demuxers listens for announcements on the given address and port. Once an announcement is received, it tries to receive that particular stream. Example command lines follow. To play back the first stream announced on the normal SAP multicast address: ffplay sap:// To play back the first stream announced on one the default IPv6 SAP multicast address: ffplay sap://[ff0e::2:7ffe] tcp Trasmission Control Protocol. The required syntax for a TCP url is: tcp://<hostname>:<port>[?<options>] listen Listen for an incoming connection timeout=microseconds In read mode: if no data arrived in more than this time interval, raise error. In write mode: if socket cannot be written in more than this time interval, raise error. This also sets timeout on TCP connection establishing. ffmpeg -i <input> -f <format> tcp://<hostname>:<port>?listen ffplay tcp://<hostname>:<port> tls Transport Layer Security/Secure Sockets Layer The required syntax for a TLS/SSL url is: tls://<hostname>:<port>[?<options>] listen Act as a server, listening for an incoming connection. cafile=filename Certificate authority file. The file must be in OpenSSL PEM format. cert=filename Certificate file. The file must be in OpenSSL PEM format. key=filename Private key file. verify=0|1 Verify the peer's certificate. Example command lines: To create a TLS/SSL server that serves an input stream. ffmpeg -i <input> -f <format> tls://<hostname>:<port>?listen&cert=<server.crt>&key=<server.key> To play back a stream from the TLS/SSL server using ffplay: ffplay tls://<hostname>:<port> udp User Datagram Protocol. The required syntax for a UDP url is: udp://<hostname>:<port>[?<options>] options contains a list of &-separated options of the form key=val. In case threading is enabled on the system, a circular buffer is used to store the incoming data, which allows to reduce loss of data due to UDP socket buffer overruns. The fifo_size and overrun_nonfatal options are related to this buffer. The list of supported options follows. buffer_size=size Set the UDP socket buffer size in bytes. This is used both for the receiving and the sending buffer size. localport=port Override the local UDP port to bind with. localaddr=addr Choose the local IP address. This is useful e.g. if sending multicast and the host has multiple interfaces, where the user can choose which interface to send on by specifying the IP address of that interface. pkt_size=size Set the size in bytes of UDP packets. reuse=1|0 Explicitly allow or disallow reusing UDP sockets. ttl=ttl Set the time to live value (for multicast only). connect=1|0 Initialize the UDP socket with "connect()". In this case, the destination address can't be changed with ff_udp_set_remote_url later. If the destination address isn't known at the start, this option can be specified in ff_udp_set_remote_url, too. This allows finding out the source address for the packets with getsockname, and makes writes return with AVERROR(ECONNREFUSED) if "destination unreachable" is received. For receiving, this gives the benefit of only receiving packets from the specified peer address/port. sources=address[,address] Only receive packets sent to the multicast group from one of the specified sender IP addresses. block=address[,address] Ignore packets sent to the multicast group from the specified sender IP addresses. fifo_size=units Set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes. If not specified defaults to 7*4096. overrun_nonfatal=1|0 Survive in case of UDP receiving circular buffer overrun. Default value is 0. timeout=microseconds In read mode: if no data arrived in more than this time interval, raise error. Some usage examples of the UDP protocol with ffmpeg follow. To stream over UDP to a remote endpoint: ffmpeg -i <input> -f <format> udp://<hostname>:<port> To stream in mpegts format over UDP using 188 sized UDP packets, using a large input buffer: ffmpeg -i <input> -f mpegts udp://<hostname>:<port>?pkt_size=188&buffer_size=65535 To receive over UDP from a remote endpoint: ffmpeg -i udp://[<multicast-address>]:<port> INPUT DEVICES Input devices are configured elements in FFmpeg which allow to access the data coming from a multimedia device attached to your system. When you configure your FFmpeg build, all the supported input devices are enabled by default. You can list all available ones using the configure option "--list-indevs". You can disable all the input devices using the configure option "--disable-indevs", and selectively enable an input device using the option "--enable-indev=INDEV", or you can disable a particular input device using the option "--disable-indev=INDEV". The option "-formats" of the ff* tools will display the list of supported input devices (amongst the demuxers). A description of the currently available input devices follows. alsa ALSA (Advanced Linux Sound Architecture) input device. To enable this input device during configuration you need libasound installed on your system. This device allows capturing from an ALSA device. The name of the device to capture has to be an ALSA card identifier. An ALSA identifier has the syntax: hw:<CARD>[,<DEV>[,<SUBDEV>]] where the DEV and SUBDEV components are optional. The three arguments (in order: CARD,DEV,SUBDEV) specify card number or identifier, device number and subdevice number (-1 means any). To see the list of cards currently recognized by your system check the files /proc/asound/cards and /proc/asound/devices. For example to capture with ffmpeg from an ALSA device with card id 0, you may run the command: ffmpeg -f alsa -i hw:0 alsaout.wav For more information see: <http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html> bktr BSD video input device. dshow Windows DirectShow input device. DirectShow support is enabled when FFmpeg is built with the mingw-w64 project. Currently only audio and video devices are supported. Multiple devices may be opened as separate inputs, but they may also be opened on the same input, which should improve synchronism between them. The input name should be in the format: <TYPE>=<NAME>[:<TYPE>=<NAME>] where TYPE can be either audio or video, and NAME is the device's name. Options If no options are specified, the device's defaults are used. If the device does not support the requested options, it will fail to open. video_size Set the video size in the captured video. framerate Set the framerate in the captured video. sample_rate Set the sample rate (in Hz) of the captured audio. sample_size Set the sample size (in bits) of the captured audio. channels Set the number of channels in the captured audio. list_devices If set to true, print a list of devices and exit. list_options If set to true, print a list of selected device's options and exit. video_device_number Set video device number for devices with same name (starts at 0, defaults to 0). audio_device_number Set audio device number for devices with same name (starts at 0, defaults to 0). pixel_format Select pixel format to be used by DirectShow. This may only be set when the video codec is not set or set to rawvideo. audio_buffer_size Set audio device buffer size in milliseconds (which can directly impact latency, depending on the device). Defaults to using the audio device's default buffer size (typically some multiple of 500ms). Setting this value too low can degrade performance. See also <http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx> Examples · Print the list of DirectShow supported devices and exit: $ ffmpeg -list_devices true -f dshow -i dummy · Open video device Camera: $ ffmpeg -f dshow -i video="Camera" · Open second video device with name Camera: $ ffmpeg -f dshow -video_device_number 1 -i video="Camera" · Open video device Camera and audio device Microphone: $ ffmpeg -f dshow -i video="Camera":audio="Microphone" · Print the list of supported options in selected device and exit: $ ffmpeg -list_options true -f dshow -i video="Camera" dv1394 Linux DV 1394 input device. fbdev Linux framebuffer input device. The Linux framebuffer is a graphic hardware-independent abstraction layer to show graphics on a computer monitor, typically on the console. It is accessed through a file device node, usually /dev/fb0. For more detailed information read the file Documentation/fb/framebuffer.txt included in the Linux source tree. To record from the framebuffer device /dev/fb0 with ffmpeg: ffmpeg -f fbdev -r 10 -i /dev/fb0 out.avi You can take a single screenshot image with the command: ffmpeg -f fbdev -frames:v 1 -r 1 -i /dev/fb0 screenshot.jpeg See also <http://linux-fbdev.sourceforge.net/>, and fbset(1). iec61883 FireWire DV/HDV input device using libiec61883. To enable this input device, you need libiec61883, libraw1394 and libavc1394 installed on your system. Use the configure option "--enable-libiec61883" to compile with the device enabled. The iec61883 capture device supports capturing from a video device connected via IEEE1394 (FireWire), using libiec61883 and the new Linux FireWire stack (juju). This is the default DV/HDV input method in Linux Kernel 2.6.37 and later, since the old FireWire stack was removed. Specify the FireWire port to be used as input file, or "auto" to choose the first port connected. Options dvtype Override autodetection of DV/HDV. This should only be used if auto detection does not work, or if usage of a different device type should be prohibited. Treating a DV device as HDV (or vice versa) will not work and result in undefined behavior. The values auto, dv and hdv are supported. dvbuffer Set maxiumum size of buffer for incoming data, in frames. For DV, this is an exact value. For HDV, it is not frame exact, since HDV does not have a fixed frame size. Examples · Grab and show the input of a FireWire DV/HDV device. ffplay -f iec61883 -i auto · Grab and record the input of a FireWire DV/HDV device, using a packet buffer of 100000 packets if the source is HDV. ffmpeg -f iec61883 -i auto -hdvbuffer 100000 out.mpg jack JACK input device. To enable this input device during configuration you need libjack installed on your system. A JACK input device creates one or more JACK writable clients, one for each audio channel, with name client_name:input_N, where client_name is the name provided by the application, and N is a number which identifies the channel. Each writable client will send the acquired data to the FFmpeg input device. Once you have created one or more JACK readable clients, you need to connect them to one or more JACK writable clients. To connect or disconnect JACK clients you can use the jack_connect and jack_disconnect programs, or do it through a graphical interface, for example with qjackctl. To list the JACK clients and their properties you can invoke the command jack_lsp. Follows an example which shows how to capture a JACK readable client with ffmpeg. # Create a JACK writable client with name "ffmpeg". $ ffmpeg -f jack -i ffmpeg -y out.wav # Start the sample jack_metro readable client. $ jack_metro -b 120 -d 0.2 -f 4000 # List the current JACK clients. $ jack_lsp -c system:capture_1 system:capture_2 system:playback_1 system:playback_2 ffmpeg:input_1 metro:120_bpm # Connect metro to the ffmpeg writable client. $ jack_connect metro:120_bpm ffmpeg:input_1 For more information read: <http://jackaudio.org/> lavfi Libavfilter input virtual device. This input device reads data from the open output pads of a libavfilter filtergraph. For each filtergraph open output, the input device will create a corresponding stream which is mapped to the generated output. Currently only video data is supported. The filtergraph is specified through the option graph. Options graph Specify the filtergraph to use as input. Each video open output must be labelled by a unique string of the form "outN", where N is a number starting from 0 corresponding to the mapped input stream generated by the device. The first unlabelled output is automatically assigned to the "out0" label, but all the others need to be specified explicitly. If not specified defaults to the filename specified for the input device. Examples · Create a color video stream and play it back with ffplay: ffplay -f lavfi -graph "color=pink [out0]" dummy · As the previous example, but use filename for specifying the graph description, and omit the "out0" label: ffplay -f lavfi color=pink · Create three different video test filtered sources and play them: ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3 · Read an audio stream from a file using the amovie source and play it back with ffplay: ffplay -f lavfi "amovie=test.wav" · Read an audio stream and a video stream and play it back with ffplay: ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]" libdc1394 IIDC1394 input device, based on libdc1394 and libraw1394. openal The OpenAL input device provides audio capture on all systems with a working OpenAL 1.1 implementation. To enable this input device during configuration, you need OpenAL headers and libraries installed on your system, and need to configure FFmpeg with "--enable-openal". OpenAL headers and libraries should be provided as part of your OpenAL implementation, or as an additional download (an SDK). Depending on your installation you may need to specify additional flags via the "--extra-cflags" and "--extra-ldflags" for allowing the build system to locate the OpenAL headers and libraries. An incomplete list of OpenAL implementations follows: Creative The official Windows implementation, providing hardware acceleration with supported devices and software fallback. See <http://openal.org/>. OpenAL Soft Portable, open source (LGPL) software implementation. Includes backends for the most common sound APIs on the Windows, Linux, Solaris, and BSD operating systems. See <http://kcat.strangesoft.net/openal.html>. Apple OpenAL is part of Core Audio, the official Mac OS X Audio interface. See <http://developer.apple.com/technologies/mac/audio-and-video.html> This device allows to capture from an audio input device handled through OpenAL. You need to specify the name of the device to capture in the provided filename. If the empty string is provided, the device will automatically select the default device. You can get the list of the supported devices by using the option list_devices. Options channels Set the number of channels in the captured audio. Only the values 1 (monaural) and 2 (stereo) are currently supported. Defaults to 2. sample_size Set the sample size (in bits) of the captured audio. Only the values 8 and 16 are currently supported. Defaults to 16. sample_rate Set the sample rate (in Hz) of the captured audio. Defaults to 44.1k. list_devices If set to true, print a list of devices and exit. Defaults to false. Examples Print the list of OpenAL supported devices and exit: $ ffmpeg -list_devices true -f openal -i dummy out.ogg Capture from the OpenAL device DR-BT101 via PulseAudio: $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg Capture from the default device (note the empty string '' as filename): $ ffmpeg -f openal -i '' out.ogg Capture from two devices simultaneously, writing to two different files, within the same ffmpeg command: $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg Note: not all OpenAL implementations support multiple simultaneous capture - try the latest OpenAL Soft if the above does not work. oss Open Sound System input device. The filename to provide to the input device is the device node representing the OSS input device, and is usually set to /dev/dsp. For example to grab from /dev/dsp using ffmpeg use the command: ffmpeg -f oss -i /dev/dsp /tmp/oss.wav For more information about OSS see: <http://manuals.opensound.com/usersguide/dsp.html> pulse pulseaudio input device. To enable this input device during configuration you need libpulse-simple installed in your system. The filename to provide to the input device is a source device or the string "default" To list the pulse source devices and their properties you can invoke the command pactl list sources. ffmpeg -f pulse -i default /tmp/pulse.wav server AVOption The syntax is: -server <server name> Connects to a specific server. name AVOption The syntax is: -name <application name> Specify the application name pulse will use when showing active clients, by default it is the LIBAVFORMAT_IDENT string stream_name AVOption The syntax is: -stream_name <stream name> Specify the stream name pulse will use when showing active streams, by default it is "record" sample_rate AVOption The syntax is: -sample_rate <samplerate> Specify the samplerate in Hz, by default 48kHz is used. channels AVOption The syntax is: -channels <N> Specify the channels in use, by default 2 (stereo) is set. frame_size AVOption The syntax is: -frame_size <bytes> Specify the number of byte per frame, by default it is set to 1024. fragment_size AVOption The syntax is: -fragment_size <bytes> Specify the minimal buffering fragment in pulseaudio, it will affect the audio latency. By default it is unset. sndio sndio input device. To enable this input device during configuration you need libsndio installed on your system. The filename to provide to the input device is the device node representing the sndio input device, and is usually set to /dev/audio0. For example to grab from /dev/audio0 using ffmpeg use the command: ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav video4linux2 Video4Linux2 input video device. The name of the device to grab is a file device node, usually Linux systems tend to automatically create such nodes when the device (e.g. an USB webcam) is plugged into the system, and has a name of the kind /dev/videoN, where N is a number associated to the device. Video4Linux2 devices usually support a limited set of widthxheight sizes and framerates. You can check which are supported using -list_formats all for Video4Linux2 devices. Some usage examples of the video4linux2 devices with ffmpeg and ffplay: The time base for the timestamps is 1 microsecond. Depending on the kernel version and configuration, the timestamps may be derived from the real time clock (origin at the Unix Epoch) or the monotonic clock (origin usually at boot time, unaffected by NTP or manual changes to the clock). The -timestamps abs or -ts abs option can be used to force conversion into the real time clock. Note that if FFmpeg is build with v4l-utils support ("--enable-libv4l2" option), it will always be used. # Grab and show the input of a video4linux2 device. ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0 # Grab and record the input of a video4linux2 device, leave the framerate and size as previously set. ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg "v4l" and "v4l2" can be used as aliases for the respective "video4linux" and "video4linux2". vfwcap VfW (Video for Windows) capture input device. The filename passed as input is the capture driver number, ranging from 0 to 9. You may use "list" as filename to print a list of drivers. Any other filename will be interpreted as device number 0. x11grab X11 video input device. This device allows to capture a region of an X11 display. The filename passed as input has the syntax: [<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>] hostname:display_number.screen_number specifies the X11 display name of the screen to grab from. hostname can be omitted, and defaults to "localhost". The environment variable DISPLAY contains the default display name. x_offset and y_offset specify the offsets of the grabbed area with respect to the top-left border of the X11 screen. They default to 0. Check the X11 documentation (e.g. man X) for more detailed information. Use the dpyinfo program for getting basic information about the properties of your X11 display (e.g. grep for "name" or "dimensions"). For example to grab from :0.0 using ffmpeg: ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpg Grab at position "10,20": ffmpeg -f x11grab -r 25 -s cif -i :0.0+10,20 out.mpg Options draw_mouse Specify whether to draw the mouse pointer. A value of 0 specify not to draw the pointer. Default value is 1. follow_mouse Make the grabbed area follow the mouse. The argument can be "centered" or a number of pixels PIXELS. When it is specified with "centered", the grabbing region follows the mouse pointer and keeps the pointer at the center of region; otherwise, the region follows only when the mouse pointer reaches within PIXELS (greater than zero) to the edge of region. For example: ffmpeg -f x11grab -follow_mouse centered -r 25 -s cif -i :0.0 out.mpg To follow only when the mouse pointer reaches within 100 pixels to edge: ffmpeg -f x11grab -follow_mouse 100 -r 25 -s cif -i :0.0 out.mpg framerate Set the grabbing frame rate. Default value is "ntsc", corresponding to a framerate of "30000/1001". show_region Show grabbed region on screen. If show_region is specified with 1, then the grabbing region will be indicated on screen. With this option, it is easy to know what is being grabbed if only a portion of the screen is grabbed. For example: ffmpeg -f x11grab -show_region 1 -r 25 -s cif -i :0.0+10,20 out.mpg With follow_mouse: ffmpeg -f x11grab -follow_mouse centered -show_region 1 -r 25 -s cif -i :0.0 out.mpg video_size Set the video frame size. Default value is "vga". 2014-07-25 FFPROBE(1)


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Hello! I'm Xinkai Chen.
Thanks for visiting. As you already know, my name is Xinkai Chen. That is 陳辛楷 in Chinese.
📍 I’m currently based in the lovely, windy city of Chicago. I’m a Data Scientist at Elevance Health striving to use my DS/ML knowledge to make healthcare easier and better for humanity.
👨🏻🎓 I graduated from Heinz College, Carnegie Mellon University in December 2020, with a Master’s degree in Information Systems Management
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Line force elements, such as a Spring, are usually connected between two parts. In fact, this is the only possibility in most multi-body programs. In an equation based system like Modelica, more general connections are possible. In particular 3-dimensional line force elements can be connected together in series without having a body with mass at the connection point. This is advantageous since stiff systems can be avoided, say, due to a stiff spring and a small mass at the connection point. For an example, see model ThreeSprings:
Here, three springs are connected together at one point, without having a body at the connection point of the springs. There is one difficulty: In such a situation the orientation object at the connection point is undefined, because the springs do not transmit torques. Translation will therefore fail, if three springs and a body are connected together in this way. To handle such a case, all line force elements have flags "fixedRotationAtFrame_a" and "fixedRotationAtFrame_b" in their "Advanced" parameter menu. For example, if "fixedRotationAtFrame_b = true", the orientation object at frame_b is explicitly set to a null rotation, i.e.,
frame_b.R = Modelica.Mechanics.MultiBody.Frames.nullRotation();
This means that the coordinate system in the connection point of the three springs is always parallel to the world frame. When this option is selected, the corresponding frame in the line force icon is marked with a red circle and with the text "R=0". This is shown in the next figure, where this option is selected for spring3.frame_b:
Note, if this flag is not set to true, a translation error will occur. Due to the usage of overdetermined connectors in the MultiBody library, the error message will be something like: .
"The overdetermined connectors <...> are connected but do not have any root defined"
The two flags "fixedRotationAtFrame_a" and "fixedRotationAtFrame_b must be set very carefully because a wrong definition can lead to a model that simulates, but the simulation result is wrong. This is the case whenever the movement of the resulting system depends on the orientation object that was arbitrarily set in parallel to the world frame. A typical example is shown in the next figure:
Here, spring3.frame_b.R is defined to be in parallel to the world frame. However, this is then also the orientation of fixedTranslation.frame_a, and this in turn means that the left part of the fixedTranslation object is always in parallel to the world frame. Since this is not correct, this model will result in a wrong simulation result This system is mathematically not well-defined and does not have a solution. The only way to model such a system is by providing a mass and an inertia tensor to fixedTranslation. Then, the flags are not needed, because the "connection" point of the springs is a body where the absolution position vector and the orientation matrix of the body-fixed coordinate system are used as states.


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