1 \input texinfo @c -*- texinfo -*-
3 @settitle FFmpeg Documentation
5 @center @titlefont{FFmpeg Documentation}
14 The generic syntax is:
18 ffmpeg [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
23 @c man begin DESCRIPTION
25 FFmpeg is a very fast video and audio converter. It can also grab from
26 a live audio/video source.
28 The command line interface is designed to be intuitive, in the sense
29 that FFmpeg tries to figure out all parameters that can possibly be
30 derived automatically. You usually only have to specify the target
33 FFmpeg can also convert from any sample rate to any other, and resize
34 video on the fly with a high quality polyphase filter.
36 As a general rule, options are applied to the next specified
37 file. Therefore, order is important, and you can have the same
38 option on the command line multiple times. Each occurrence is
39 then applied to the next input or output file.
43 To set the video bitrate of the output file to 64kbit/s:
45 ffmpeg -i input.avi -b 64k output.avi
49 To force the frame rate of the output file to 24 fps:
51 ffmpeg -i input.avi -r 24 output.avi
55 To force the frame rate of the input file (valid for raw formats only)
56 to 1 fps and the frame rate of the output file to 24 fps:
58 ffmpeg -r 1 -i input.m2v -r 24 output.avi
62 The format option may be needed for raw input files.
64 By default, FFmpeg tries to convert as losslessly as possible: It
65 uses the same audio and video parameters for the outputs as the one
66 specified for the inputs.
68 @c man end DESCRIPTION
73 @include fftools-common-opts.texi
82 @item -i @var{filename}
86 Overwrite output files.
88 @item -t @var{duration}
89 Restrict the transcoded/captured video sequence
90 to the duration specified in seconds.
91 @code{hh:mm:ss[.xxx]} syntax is also supported.
93 @item -fs @var{limit_size}
94 Set the file size limit.
96 @item -ss @var{position}
97 Seek to given time position in seconds.
98 @code{hh:mm:ss[.xxx]} syntax is also supported.
100 @item -itsoffset @var{offset}
101 Set the input time offset in seconds.
102 @code{[-]hh:mm:ss[.xxx]} syntax is also supported.
103 This option affects all the input files that follow it.
104 The offset is added to the timestamps of the input files.
105 Specifying a positive offset means that the corresponding
106 streams are delayed by 'offset' seconds.
108 @item -timestamp @var{time}
109 Set the recording timestamp in the container.
110 The syntax for @var{time} is:
112 now|([(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH[:MM[:SS[.m...]]])|(HH[MM[SS[.m...]]]))[Z|z])
114 If the value is "now" it takes the current time.
115 Time is local time unless 'Z' or 'z' is appended, in which case it is
117 If the year-month-day part is not specified it takes the current
120 @item -metadata @var{key}=@var{value}
121 Set a metadata key/value pair.
123 For example, for setting the title in the output file:
125 ffmpeg -i in.avi -metadata title="my title" out.flv
128 @item -v @var{number}
129 Set the logging verbosity level.
131 @item -target @var{type}
132 Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
133 "ntsc-svcd", ... ). All the format options (bitrate, codecs,
134 buffer sizes) are then set automatically. You can just type:
137 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
140 Nevertheless you can specify additional options as long as you know
141 they do not conflict with the standard, as in:
144 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
147 @item -dframes @var{number}
148 Set the number of data frames to record.
150 @item -scodec @var{codec}
151 Force subtitle codec ('copy' to copy stream).
154 Add a new subtitle stream to the current output stream.
156 @item -slang @var{code}
157 Set the ISO 639 language code (3 letters) of the current subtitle stream.
161 @section Video Options
164 @item -b @var{bitrate}
165 Set the video bitrate in bit/s (default = 200 kb/s).
166 @item -vframes @var{number}
167 Set the number of video frames to record.
169 Set frame rate (Hz value, fraction or abbreviation), (default = 25).
171 Set frame size. The format is @samp{wxh} (ffserver default = 160x128, ffmpeg default = same as source).
172 The following abbreviations are recognized:
234 @item -aspect @var{aspect}
235 Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
236 @item -croptop @var{size}
237 @item -cropbottom @var{size}
238 @item -cropleft @var{size}
239 @item -cropright @var{size}
240 All the crop options have been removed. Use -vf
241 crop=width:height:x:y instead.
243 @item -padtop @var{size}
244 @item -padbottom @var{size}
245 @item -padleft @var{size}
246 @item -padright @var{size}
247 @item -padcolor @var{hex_color}
248 All the pad options have been removed. Use -vf
249 pad=width:height:x:y:color instead.
251 Disable video recording.
252 @item -bt @var{tolerance}
253 Set video bitrate tolerance (in bits, default 4000k).
254 Has a minimum value of: (target_bitrate/target_framerate).
255 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
256 willing to deviate from the target average bitrate value. This is
257 not related to min/max bitrate. Lowering tolerance too much has
258 an adverse effect on quality.
259 @item -maxrate @var{bitrate}
260 Set max video bitrate (in bit/s).
261 Requires -bufsize to be set.
262 @item -minrate @var{bitrate}
263 Set min video bitrate (in bit/s).
264 Most useful in setting up a CBR encode:
266 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
268 It is of little use elsewise.
269 @item -bufsize @var{size}
270 Set video buffer verifier buffer size (in bits).
271 @item -vcodec @var{codec}
272 Force video codec to @var{codec}. Use the @code{copy} special value to
273 tell that the raw codec data must be copied as is.
275 Use same video quality as source (implies VBR).
278 Select the pass number (1 or 2). It is used to do two-pass
279 video encoding. The statistics of the video are recorded in the first
280 pass into a log file (see also the option -passlogfile),
281 and in the second pass that log file is used to generate the video
282 at the exact requested bitrate.
283 On pass 1, you may just deactivate audio and set output to null,
284 examples for Windows and Unix:
286 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
287 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
290 @item -passlogfile @var{prefix}
291 Set two-pass log file name prefix to @var{prefix}, the default file name
292 prefix is ``ffmpeg2pass''. The complete file name will be
293 @file{PREFIX-N.log}, where N is a number specific to the output
297 Add a new video stream to the current output stream.
299 @item -vlang @var{code}
300 Set the ISO 639 language code (3 letters) of the current video stream.
302 @item -vf @var{filter_graph}
303 @var{filter_graph} is a description of the filter graph to apply to
305 Use the option "-filters" to show all the available filters (including
306 also sources and sinks).
310 @section Advanced Video Options
313 @item -pix_fmt @var{format}
314 Set pixel format. Use 'list' as parameter to show all the supported
316 @item -sws_flags @var{flags}
318 @item -g @var{gop_size}
319 Set the group of pictures size.
321 Use only intra frames.
324 @item -qscale @var{q}
325 Use fixed video quantizer scale (VBR).
327 minimum video quantizer scale (VBR)
329 maximum video quantizer scale (VBR)
331 maximum difference between the quantizer scales (VBR)
332 @item -qblur @var{blur}
333 video quantizer scale blur (VBR) (range 0.0 - 1.0)
334 @item -qcomp @var{compression}
335 video quantizer scale compression (VBR) (default 0.5).
336 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
338 @item -lmin @var{lambda}
339 minimum video lagrange factor (VBR)
340 @item -lmax @var{lambda}
341 max video lagrange factor (VBR)
342 @item -mblmin @var{lambda}
343 minimum macroblock quantizer scale (VBR)
344 @item -mblmax @var{lambda}
345 maximum macroblock quantizer scale (VBR)
347 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
348 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
350 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
353 @item -rc_init_cplx @var{complexity}
354 initial complexity for single pass encoding
355 @item -b_qfactor @var{factor}
356 qp factor between P- and B-frames
357 @item -i_qfactor @var{factor}
358 qp factor between P- and I-frames
359 @item -b_qoffset @var{offset}
360 qp offset between P- and B-frames
361 @item -i_qoffset @var{offset}
362 qp offset between P- and I-frames
363 @item -rc_eq @var{equation}
364 Set rate control equation (see section "Expression Evaluation")
365 (default = @code{tex^qComp}).
367 When computing the rate control equation expression, besides the
368 standard functions defined in the section "Expression Evaluation", the
369 following functions are available:
375 and the following constants are available:
397 @item -rc_override @var{override}
398 rate control override for specific intervals
399 @item -me_method @var{method}
400 Set motion estimation method to @var{method}.
401 Available methods are (from lowest to best quality):
404 Try just the (0, 0) vector.
413 exhaustive search (slow and marginally better than epzs)
416 @item -dct_algo @var{algo}
417 Set DCT algorithm to @var{algo}. Available values are:
420 FF_DCT_AUTO (default)
433 @item -idct_algo @var{algo}
434 Set IDCT algorithm to @var{algo}. Available values are:
437 FF_IDCT_AUTO (default)
461 Set error resilience to @var{n}.
464 FF_ER_CAREFUL (default)
470 FF_ER_VERY_AGGRESSIVE
473 @item -ec @var{bit_mask}
474 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
475 the following values:
478 FF_EC_GUESS_MVS (default = enabled)
480 FF_EC_DEBLOCK (default = enabled)
483 @item -bf @var{frames}
484 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
485 @item -mbd @var{mode}
489 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).
491 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
493 FF_MB_DECISION_RD: rate distortion
497 Use four motion vector by macroblock (MPEG-4 only).
499 Use data partitioning (MPEG-4 only).
500 @item -bug @var{param}
501 Work around encoder bugs that are not auto-detected.
502 @item -strict @var{strictness}
503 How strictly to follow the standards.
505 Enable Advanced intra coding (h263+).
507 Enable Unlimited Motion Vector (h263+)
510 Deinterlace pictures.
512 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
513 Use this option if your input file is interlaced and you want
514 to keep the interlaced format for minimum losses.
515 The alternative is to deinterlace the input stream with
516 @option{-deinterlace}, but deinterlacing introduces losses.
518 Calculate PSNR of compressed frames.
520 Dump video coding statistics to @file{vstats_HHMMSS.log}.
521 @item -vstats_file @var{file}
522 Dump video coding statistics to @var{file}.
524 top=1/bottom=0/auto=-1 field first
525 @item -dc @var{precision}
527 @item -vtag @var{fourcc/tag}
528 Force video tag/fourcc.
531 @item -vbsf @var{bitstream_filter}
532 Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
534 ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
536 @item -force_key_frames @var{time}[,@var{time}...]
537 Force key frames at the specified timestamps, more precisely at the first
538 frames after each specified time.
539 This option can be useful to ensure that a seek point is present at a
540 chapter mark or any other designated place in the output file.
541 The timestamps must be specified in ascending order.
544 @section Audio Options
547 @item -aframes @var{number}
548 Set the number of audio frames to record.
550 Set the audio sampling frequency. For input streams it is set by
551 default to 44100 Hz, for output streams it is set by default to the
552 frequency of the input stream. If the input file has audio streams
553 with different frequencies, the behaviour is undefined.
554 @item -ab @var{bitrate}
555 Set the audio bitrate in bit/s (default = 64k).
557 Set the audio quality (codec-specific, VBR).
558 @item -ac @var{channels}
559 Set the number of audio channels. For input streams it is set by
560 default to 1, for output streams it is set by default to the same
561 number of audio channels in input. If the input file has audio streams
562 with different channel count, the behaviour is undefined.
564 Disable audio recording.
565 @item -acodec @var{codec}
566 Force audio codec to @var{codec}. Use the @code{copy} special value to
567 specify that the raw codec data must be copied as is.
569 Add a new audio track to the output file. If you want to specify parameters,
570 do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
572 Mapping will be done automatically, if the number of output streams is equal to
573 the number of input streams, else it will pick the first one that matches. You
574 can override the mapping using @code{-map} as usual.
578 ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
580 @item -alang @var{code}
581 Set the ISO 639 language code (3 letters) of the current audio stream.
584 @section Advanced Audio options:
587 @item -atag @var{fourcc/tag}
588 Force audio tag/fourcc.
589 @item -absf @var{bitstream_filter}
590 Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
593 @section Subtitle options:
596 @item -scodec @var{codec}
597 Force subtitle codec ('copy' to copy stream).
599 Add a new subtitle stream to the current output stream.
600 @item -slang @var{code}
601 Set the ISO 639 language code (3 letters) of the current subtitle stream.
603 Disable subtitle recording.
604 @item -sbsf @var{bitstream_filter}
605 Bitstream filters available are "mov2textsub", "text2movsub".
607 ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
611 @section Audio/Video grab options
614 @item -vc @var{channel}
615 Set video grab channel (DV1394 only).
616 @item -tvstd @var{standard}
617 Set television standard (NTSC, PAL (SECAM)).
619 Synchronize read on input.
622 @section Advanced options
625 @item -map @var{input_stream_id}[:@var{sync_stream_id}]
626 Set stream mapping from input streams to output streams.
627 Just enumerate the input streams in the order you want them in the output.
628 @var{sync_stream_id} if specified sets the input stream to sync
630 @item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
631 Deprecated, use @var{-map_metadata} instead.
633 @item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
634 Set metadata information of @var{outfile} from @var{infile}. Note that those
635 are file indices (zero-based), not filenames.
636 Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
637 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
638 per-(p)rogram. All metadata specifiers other than global must be followed by the
639 stream/chapter/program number. If metadata specifier is omitted, it defaults to
642 By default, global metadata is copied from the first input file to all output files,
643 per-stream and per-chapter metadata is copied along with streams/chapters. These
644 default mappings are disabled by creating any mapping of the relevant type. A negative
645 file index can be used to create a dummy mapping that just disables automatic copying.
647 For example to copy metadata from the first stream of the input file to global metadata
650 ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
652 @item -map_chapters @var{outfile}:@var{infile}
653 Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
654 then chapters are copied from the first input file with at least one chapter to all
655 output files. Use a negative file index to disable any chapter copying.
657 Print specific debug info.
659 Show benchmarking information at the end of an encode.
660 Shows CPU time used and maximum memory consumption.
661 Maximum memory consumption is not supported on all systems,
662 it will usually display as 0 if not supported.
664 Dump each input packet.
666 When dumping packets, also dump the payload.
668 Only use bit exact algorithms (for codec testing).
670 Set RTP payload size in bytes.
672 Read input at native frame rate. Mainly used to simulate a grab device.
674 Loop over the input stream. Currently it works only for image
675 streams. This option is used for automatic FFserver testing.
676 @item -loop_output @var{number_of_times}
677 Repeatedly loop output for formats that support looping such as animated GIF
678 (0 will loop the output infinitely).
679 @item -threads @var{count}
681 @item -vsync @var{parameter}
686 Each frame is passed with its timestamp from the demuxer to the muxer.
688 Frames will be duplicated and dropped to achieve exactly the requested
691 Frames are passed through with their timestamp or dropped so as to
692 prevent 2 frames from having the same timestamp.
694 Chooses between 1 and 2 depending on muxer capabilities. This is the
698 With -map you can select from which stream the timestamps should be
699 taken. You can leave either video or audio unchanged and sync the
700 remaining stream(s) to the unchanged one.
702 @item -async @var{samples_per_second}
703 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
704 the parameter is the maximum samples per second by which the audio is changed.
705 -async 1 is a special case where only the start of the audio stream is corrected
706 without any later correction.
708 Copy timestamps from input to output.
710 Copy input stream time base from input to output when stream copying.
712 Finish encoding when the shortest input stream ends.
713 @item -dts_delta_threshold
714 Timestamp discontinuity delta threshold.
715 @item -muxdelay @var{seconds}
716 Set the maximum demux-decode delay.
717 @item -muxpreload @var{seconds}
718 Set the initial demux-decode delay.
719 @item -streamid @var{output-stream-index}:@var{new-value}
720 Assign a new stream-id value to an output stream. This option should be
721 specified prior to the output filename to which it applies.
722 For the situation where multiple output files exist, a streamid
723 may be reassigned to a different value.
725 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
726 an output mpegts file:
728 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
732 @section Preset files
734 A preset file contains a sequence of @var{option}=@var{value} pairs,
735 one for each line, specifying a sequence of options which would be
736 awkward to specify on the command line. Lines starting with the hash
737 ('#') character are ignored and are used to provide comments. Check
738 the @file{ffpresets} directory in the FFmpeg source tree for examples.
740 Preset files are specified with the @code{vpre}, @code{apre},
741 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
742 filename of the preset instead of a preset name as input and can be
743 used for any kind of codec. For the @code{vpre}, @code{apre}, and
744 @code{spre} options, the options specified in a preset file are
745 applied to the currently selected codec of the same type as the preset
748 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
749 preset options identifies the preset file to use according to the
752 First ffmpeg searches for a file named @var{arg}.ffpreset in the
753 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
754 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
755 in that order. For example, if the argument is @code{libx264-max}, it will
756 search for the file @file{libx264-max.ffpreset}.
758 If no such file is found, then ffmpeg will search for a file named
759 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
760 directories, where @var{codec_name} is the name of the codec to which
761 the preset file options will be applied. For example, if you select
762 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
763 then it will search for the file @file{libx264-max.ffpreset}.
771 For streaming at very low bitrate application, use a low frame rate
772 and a small GOP size. This is especially true for RealVideo where
773 the Linux player does not seem to be very fast, so it can miss
774 frames. An example is:
777 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
781 The parameter 'q' which is displayed while encoding is the current
782 quantizer. The value 1 indicates that a very good quality could
783 be achieved. The value 31 indicates the worst quality. If q=31 appears
784 too often, it means that the encoder cannot compress enough to meet
785 your bitrate. You must either increase the bitrate, decrease the
786 frame rate or decrease the frame size.
789 If your computer is not fast enough, you can speed up the
790 compression at the expense of the compression ratio. You can use
791 '-me zero' to speed up motion estimation, and '-intra' to disable
792 motion estimation completely (you have only I-frames, which means it
793 is about as good as JPEG compression).
796 To have very low audio bitrates, reduce the sampling frequency
797 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
800 To have a constant quality (but a variable bitrate), use the option
801 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
805 When converting video files, you can use the '-sameq' option which
806 uses the same quality factor in the encoder as in the decoder.
807 It allows almost lossless encoding.
813 @c man begin EXAMPLES
815 @section Video and Audio grabbing
817 FFmpeg can grab video and audio from devices given that you specify the input
821 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
824 Note that you must activate the right video source and channel before
825 launching FFmpeg with any TV viewer such as xawtv
826 (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
827 have to set the audio recording levels correctly with a
830 @section X11 grabbing
832 FFmpeg can grab the X11 display.
835 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
838 0.0 is display.screen number of your X11 server, same as
839 the DISPLAY environment variable.
842 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
845 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
846 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
848 @section Video and Audio file format conversion
850 FFmpeg can use any supported file format and protocol as input:
855 You can use YUV files as input:
858 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
861 It will use the files:
863 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
864 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
867 The Y files use twice the resolution of the U and V files. They are
868 raw files, without header. They can be generated by all decent video
869 decoders. You must specify the size of the image with the @option{-s} option
870 if FFmpeg cannot guess it.
873 You can input from a raw YUV420P file:
876 ffmpeg -i /tmp/test.yuv /tmp/out.avi
879 test.yuv is a file containing raw YUV planar data. Each frame is composed
880 of the Y plane followed by the U and V planes at half vertical and
881 horizontal resolution.
884 You can output to a raw YUV420P file:
887 ffmpeg -i mydivx.avi hugefile.yuv
891 You can set several input files and output files:
894 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
897 Converts the audio file a.wav and the raw YUV video file a.yuv
901 You can also do audio and video conversions at the same time:
904 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
907 Converts a.wav to MPEG audio at 22050 Hz sample rate.
910 You can encode to several formats at the same time and define a
911 mapping from input stream to output streams:
914 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
917 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
918 file:index' specifies which input stream is used for each output
919 stream, in the order of the definition of output streams.
922 You can transcode decrypted VOBs:
925 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
928 This is a typical DVD ripping example; the input is a VOB file, the
929 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
930 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
931 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
932 input video. Furthermore, the audio stream is MP3-encoded so you need
933 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
934 The mapping is particularly useful for DVD transcoding
935 to get the desired audio language.
937 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
940 You can extract images from a video, or create a video from many images:
942 For extracting images from a video:
944 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
947 This will extract one video frame per second from the video and will
948 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
949 etc. Images will be rescaled to fit the new WxH values.
951 If you want to extract just a limited number of frames, you can use the
952 above command in combination with the -vframes or -t option, or in
953 combination with -ss to start extracting from a certain point in time.
955 For creating a video from many images:
957 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
960 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
961 composed of three digits padded with zeroes to express the sequence
962 number. It is the same syntax supported by the C printf function, but
963 only formats accepting a normal integer are suitable.
966 You can put many streams of the same type in the output:
969 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
972 In addition to the first video and audio streams, the resulting
973 output file @file{test12.avi} will contain the second video
974 and the second audio stream found in the input streams list.
976 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
977 options have to be specified immediately after the name of the output
978 file to which you want to add them.
984 @include demuxers.texi
987 @include outdevs.texi
988 @include protocols.texi
989 @include bitstream_filters.texi
990 @include filters.texi
991 @include metadata.texi
996 @settitle FFmpeg video converter
999 ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
1002 @c man begin AUTHORS
1003 The FFmpeg developers