1 \input texinfo @c -*- texinfo -*-
3 @settitle FFmpeg Documentation
6 @center @titlefont{FFmpeg Documentation}
12 The generic syntax is:
16 ffmpeg [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
21 @c man begin DESCRIPTION
23 FFmpeg is a very fast video and audio converter. It can also grab from
24 a live audio/video source.
26 The command line interface is designed to be intuitive, in the sense
27 that FFmpeg tries to figure out all parameters that can possibly be
28 derived automatically. You usually only have to specify the target
31 FFmpeg can also convert from any sample rate to any other, and resize
32 video on the fly with a high quality polyphase filter.
34 As a general rule, options are applied to the next specified
35 file. Therefore, order is important, and you can have the same
36 option on the command line multiple times. Each occurrence is
37 then applied to the next input or output file.
41 To set the video bitrate of the output file to 64kbit/s:
43 ffmpeg -i input.avi -b 64k output.avi
47 To force the frame rate of the output file to 24 fps:
49 ffmpeg -i input.avi -r 24 output.avi
53 To force the frame rate of the input file (valid for raw formats only)
54 to 1 fps and the frame rate of the output file to 24 fps:
56 ffmpeg -r 1 -i input.m2v -r 24 output.avi
60 The format option may be needed for raw input files.
62 By default, FFmpeg tries to convert as losslessly as possible: It
63 uses the same audio and video parameters for the outputs as the one
64 specified for the inputs.
66 @c man end DESCRIPTION
71 @include fftools-common-opts.texi
80 @item -i @var{filename}
84 Overwrite output files.
86 @item -t @var{duration}
87 Restrict the transcoded/captured video sequence
88 to the duration specified in seconds.
89 @code{hh:mm:ss[.xxx]} syntax is also supported.
91 @item -fs @var{limit_size}
92 Set the file size limit.
94 @item -ss @var{position}
95 Seek to given time position in seconds.
96 @code{hh:mm:ss[.xxx]} syntax is also supported.
98 @item -itsoffset @var{offset}
99 Set the input time offset in seconds.
100 @code{[-]hh:mm:ss[.xxx]} syntax is also supported.
101 This option affects all the input files that follow it.
102 The offset is added to the timestamps of the input files.
103 Specifying a positive offset means that the corresponding
104 streams are delayed by 'offset' seconds.
106 @item -timestamp @var{time}
107 Set the recording timestamp in the container.
108 The syntax for @var{time} is:
110 now|([(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH[:MM[:SS[.m...]]])|(HH[MM[SS[.m...]]]))[Z|z])
112 If the value is "now" it takes the current time.
113 Time is local time unless 'Z' or 'z' is appended, in which case it is
115 If the year-month-day part is not specified it takes the current
118 @item -metadata @var{key}=@var{value}
119 Set a metadata key/value pair.
121 For example, for setting the title in the output file:
123 ffmpeg -i in.avi -metadata title="my title" out.flv
126 @item -v @var{number}
127 Set the logging verbosity level.
129 @item -target @var{type}
130 Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
131 "ntsc-svcd", ... ). All the format options (bitrate, codecs,
132 buffer sizes) are then set automatically. You can just type:
135 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
138 Nevertheless you can specify additional options as long as you know
139 they do not conflict with the standard, as in:
142 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
145 @item -dframes @var{number}
146 Set the number of data frames to record.
148 @item -scodec @var{codec}
149 Force subtitle codec ('copy' to copy stream).
152 Add a new subtitle stream to the current output stream.
154 @item -slang @var{code}
155 Set the ISO 639 language code (3 letters) of the current subtitle stream.
159 @section Video Options
162 @item -b @var{bitrate}
163 Set the video bitrate in bit/s (default = 200 kb/s).
164 @item -vframes @var{number}
165 Set the number of video frames to record.
167 Set frame rate (Hz value, fraction or abbreviation), (default = 25).
169 Set frame size. The format is @samp{wxh} (ffserver default = 160x128, ffmpeg default = same as source).
170 The following abbreviations are recognized:
232 @item -aspect @var{aspect}
233 Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
234 @item -croptop @var{size}
235 @item -cropbottom @var{size}
236 @item -cropleft @var{size}
237 @item -cropright @var{size}
238 All the crop options have been removed. Use -vf
239 crop=width:height:x:y instead.
241 @item -padtop @var{size}
242 @item -padbottom @var{size}
243 @item -padleft @var{size}
244 @item -padright @var{size}
245 @item -padcolor @var{hex_color}
246 All the pad options have been removed. Use -vf
247 pad=width:height:x:y:color instead.
249 Disable video recording.
250 @item -bt @var{tolerance}
251 Set video bitrate tolerance (in bits, default 4000k).
252 Has a minimum value of: (target_bitrate/target_framerate).
253 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
254 willing to deviate from the target average bitrate value. This is
255 not related to min/max bitrate. Lowering tolerance too much has
256 an adverse effect on quality.
257 @item -maxrate @var{bitrate}
258 Set max video bitrate (in bit/s).
259 Requires -bufsize to be set.
260 @item -minrate @var{bitrate}
261 Set min video bitrate (in bit/s).
262 Most useful in setting up a CBR encode:
264 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
266 It is of little use elsewise.
267 @item -bufsize @var{size}
268 Set video buffer verifier buffer size (in bits).
269 @item -vcodec @var{codec}
270 Force video codec to @var{codec}. Use the @code{copy} special value to
271 tell that the raw codec data must be copied as is.
273 Use same video quality as source (implies VBR).
276 Select the pass number (1 or 2). It is used to do two-pass
277 video encoding. The statistics of the video are recorded in the first
278 pass into a log file (see also the option -passlogfile),
279 and in the second pass that log file is used to generate the video
280 at the exact requested bitrate.
281 On pass 1, you may just deactivate audio and set output to null,
282 examples for Windows and Unix:
284 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
285 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
288 @item -passlogfile @var{prefix}
289 Set two-pass log file name prefix to @var{prefix}, the default file name
290 prefix is ``ffmpeg2pass''. The complete file name will be
291 @file{PREFIX-N.log}, where N is a number specific to the output
295 Add a new video stream to the current output stream.
297 @item -vlang @var{code}
298 Set the ISO 639 language code (3 letters) of the current video stream.
300 @item -vf @var{filter_graph}
301 @var{filter_graph} is a description of the filter graph to apply to
303 Use the option "-filters" to show all the available filters (including
304 also sources and sinks).
308 @section Advanced Video Options
311 @item -pix_fmt @var{format}
312 Set pixel format. Use 'list' as parameter to show all the supported
314 @item -sws_flags @var{flags}
316 @item -g @var{gop_size}
317 Set the group of pictures size.
319 Use only intra frames.
322 @item -qscale @var{q}
323 Use fixed video quantizer scale (VBR).
325 minimum video quantizer scale (VBR)
327 maximum video quantizer scale (VBR)
329 maximum difference between the quantizer scales (VBR)
330 @item -qblur @var{blur}
331 video quantizer scale blur (VBR) (range 0.0 - 1.0)
332 @item -qcomp @var{compression}
333 video quantizer scale compression (VBR) (default 0.5).
334 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
336 @item -lmin @var{lambda}
337 minimum video lagrange factor (VBR)
338 @item -lmax @var{lambda}
339 max video lagrange factor (VBR)
340 @item -mblmin @var{lambda}
341 minimum macroblock quantizer scale (VBR)
342 @item -mblmax @var{lambda}
343 maximum macroblock quantizer scale (VBR)
345 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
346 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
348 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
351 @item -rc_init_cplx @var{complexity}
352 initial complexity for single pass encoding
353 @item -b_qfactor @var{factor}
354 qp factor between P- and B-frames
355 @item -i_qfactor @var{factor}
356 qp factor between P- and I-frames
357 @item -b_qoffset @var{offset}
358 qp offset between P- and B-frames
359 @item -i_qoffset @var{offset}
360 qp offset between P- and I-frames
361 @item -rc_eq @var{equation}
362 Set rate control equation (see section "Expression Evaluation")
363 (default = @code{tex^qComp}).
365 When computing the rate control equation expression, besides the
366 standard functions defined in the section "Expression Evaluation", the
367 following functions are available:
373 and the following constants are available:
395 @item -rc_override @var{override}
396 rate control override for specific intervals
397 @item -me_method @var{method}
398 Set motion estimation method to @var{method}.
399 Available methods are (from lowest to best quality):
402 Try just the (0, 0) vector.
411 exhaustive search (slow and marginally better than epzs)
414 @item -dct_algo @var{algo}
415 Set DCT algorithm to @var{algo}. Available values are:
418 FF_DCT_AUTO (default)
431 @item -idct_algo @var{algo}
432 Set IDCT algorithm to @var{algo}. Available values are:
435 FF_IDCT_AUTO (default)
459 Set error resilience to @var{n}.
462 FF_ER_CAREFUL (default)
468 FF_ER_VERY_AGGRESSIVE
471 @item -ec @var{bit_mask}
472 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
473 the following values:
476 FF_EC_GUESS_MVS (default = enabled)
478 FF_EC_DEBLOCK (default = enabled)
481 @item -bf @var{frames}
482 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
483 @item -mbd @var{mode}
487 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).
489 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
491 FF_MB_DECISION_RD: rate distortion
495 Use four motion vector by macroblock (MPEG-4 only).
497 Use data partitioning (MPEG-4 only).
498 @item -bug @var{param}
499 Work around encoder bugs that are not auto-detected.
500 @item -strict @var{strictness}
501 How strictly to follow the standards.
503 Enable Advanced intra coding (h263+).
505 Enable Unlimited Motion Vector (h263+)
508 Deinterlace pictures.
510 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
511 Use this option if your input file is interlaced and you want
512 to keep the interlaced format for minimum losses.
513 The alternative is to deinterlace the input stream with
514 @option{-deinterlace}, but deinterlacing introduces losses.
516 Calculate PSNR of compressed frames.
518 Dump video coding statistics to @file{vstats_HHMMSS.log}.
519 @item -vstats_file @var{file}
520 Dump video coding statistics to @var{file}.
522 top=1/bottom=0/auto=-1 field first
523 @item -dc @var{precision}
525 @item -vtag @var{fourcc/tag}
526 Force video tag/fourcc.
529 @item -vbsf @var{bitstream_filter}
530 Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
532 ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
534 @item -force_key_frames @var{time}[,@var{time}...]
535 Force key frames at the specified timestamps, more precisely at the first
536 frames after each specified time.
537 This option can be useful to ensure that a seek point is present at a
538 chapter mark or any other designated place in the output file.
539 The timestamps must be specified in ascending order.
542 @section Audio Options
545 @item -aframes @var{number}
546 Set the number of audio frames to record.
548 Set the audio sampling frequency. For input streams it is set by
549 default to 44100 Hz, for output streams it is set by default to the
550 frequency of the input stream. If the input file has audio streams
551 with different frequencies, the behaviour is undefined.
552 @item -ab @var{bitrate}
553 Set the audio bitrate in bit/s (default = 64k).
555 Set the audio quality (codec-specific, VBR).
556 @item -ac @var{channels}
557 Set the number of audio channels. For input streams it is set by
558 default to 1, for output streams it is set by default to the same
559 number of audio channels in input. If the input file has audio streams
560 with different channel count, the behaviour is undefined.
562 Disable audio recording.
563 @item -acodec @var{codec}
564 Force audio codec to @var{codec}. Use the @code{copy} special value to
565 specify that the raw codec data must be copied as is.
567 Add a new audio track to the output file. If you want to specify parameters,
568 do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
570 Mapping will be done automatically, if the number of output streams is equal to
571 the number of input streams, else it will pick the first one that matches. You
572 can override the mapping using @code{-map} as usual.
576 ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
578 @item -alang @var{code}
579 Set the ISO 639 language code (3 letters) of the current audio stream.
582 @section Advanced Audio options:
585 @item -atag @var{fourcc/tag}
586 Force audio tag/fourcc.
587 @item -absf @var{bitstream_filter}
588 Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
591 @section Subtitle options:
594 @item -scodec @var{codec}
595 Force subtitle codec ('copy' to copy stream).
597 Add a new subtitle stream to the current output stream.
598 @item -slang @var{code}
599 Set the ISO 639 language code (3 letters) of the current subtitle stream.
601 Disable subtitle recording.
602 @item -sbsf @var{bitstream_filter}
603 Bitstream filters available are "mov2textsub", "text2movsub".
605 ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
609 @section Audio/Video grab options
612 @item -vc @var{channel}
613 Set video grab channel (DV1394 only).
614 @item -tvstd @var{standard}
615 Set television standard (NTSC, PAL (SECAM)).
617 Synchronize read on input.
620 @section Advanced options
623 @item -map @var{input_stream_id}[:@var{sync_stream_id}]
624 Set stream mapping from input streams to output streams.
625 Just enumerate the input streams in the order you want them in the output.
626 @var{sync_stream_id} if specified sets the input stream to sync
628 @item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
629 Set meta data information of @var{outfile} from @var{infile}. Note that those
630 are file indices (zero-based), not filenames.
631 Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
632 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
633 per-(p)rogram. All metadata specifiers other than global must be followed by the
634 stream/chapter/program number. If metadata specifier is omitted, it defaults to
637 By default, global metadata is copied from the first input file to all output files,
638 per-stream and per-chapter metadata is copied along with streams/chapters. These
639 default mappings are disabled by creating any mapping of the relevant type. A negative
640 file index can be used to create a dummy mapping that just disables automatic copying.
642 For example to copy metadata from the first stream of the input file to global metadata
645 ffmpeg -i in.ogg -map_meta_data 0:0,s0 out.mp3
647 @item -map_chapters @var{outfile}:@var{infile}
648 Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
649 then chapters are copied from the first input file with at least one chapter to all
650 output files. Use a negative file index to disable any chapter copying.
652 Print specific debug info.
654 Show benchmarking information at the end of an encode.
655 Shows CPU time used and maximum memory consumption.
656 Maximum memory consumption is not supported on all systems,
657 it will usually display as 0 if not supported.
659 Dump each input packet.
661 When dumping packets, also dump the payload.
663 Only use bit exact algorithms (for codec testing).
665 Set RTP payload size in bytes.
667 Read input at native frame rate. Mainly used to simulate a grab device.
669 Loop over the input stream. Currently it works only for image
670 streams. This option is used for automatic FFserver testing.
671 @item -loop_output @var{number_of_times}
672 Repeatedly loop output for formats that support looping such as animated GIF
673 (0 will loop the output infinitely).
674 @item -threads @var{count}
676 @item -vsync @var{parameter}
681 Each frame is passed with its timestamp from the demuxer to the muxer.
683 Frames will be duplicated and dropped to achieve exactly the requested
686 Frames are passed through with their timestamp or dropped so as to
687 prevent 2 frames from having the same timestamp.
689 Chooses between 1 and 2 depending on muxer capabilities. This is the
693 With -map you can select from which stream the timestamps should be
694 taken. You can leave either video or audio unchanged and sync the
695 remaining stream(s) to the unchanged one.
697 @item -async @var{samples_per_second}
698 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
699 the parameter is the maximum samples per second by which the audio is changed.
700 -async 1 is a special case where only the start of the audio stream is corrected
701 without any later correction.
703 Copy timestamps from input to output.
705 Copy input stream time base from input to output when stream copying.
707 Finish encoding when the shortest input stream ends.
708 @item -dts_delta_threshold
709 Timestamp discontinuity delta threshold.
710 @item -muxdelay @var{seconds}
711 Set the maximum demux-decode delay.
712 @item -muxpreload @var{seconds}
713 Set the initial demux-decode delay.
714 @item -streamid @var{output-stream-index}:@var{new-value}
715 Assign a new value to a stream's stream-id field in the next output file.
716 All stream-id fields are reset to default for each output file.
718 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
719 an output mpegts file:
721 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
725 @section Preset files
727 A preset file contains a sequence of @var{option}=@var{value} pairs,
728 one for each line, specifying a sequence of options which would be
729 awkward to specify on the command line. Lines starting with the hash
730 ('#') character are ignored and are used to provide comments. Check
731 the @file{ffpresets} directory in the FFmpeg source tree for examples.
733 Preset files are specified with the @code{vpre}, @code{apre},
734 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
735 filename of the preset instead of a preset name as input and can be
736 used for any kind of codec. For the @code{vpre}, @code{apre}, and
737 @code{spre} options, the options specified in a preset file are
738 applied to the currently selected codec of the same type as the preset
741 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
742 preset options identifies the preset file to use according to the
745 First ffmpeg searches for a file named @var{arg}.ffpreset in the
746 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
747 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
748 in that order. For example, if the argument is @code{libx264-max}, it will
749 search for the file @file{libx264-max.ffpreset}.
751 If no such file is found, then ffmpeg will search for a file named
752 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
753 directories, where @var{codec_name} is the name of the codec to which
754 the preset file options will be applied. For example, if you select
755 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
756 then it will search for the file @file{libx264-max.ffpreset}.
764 For streaming at very low bitrate application, use a low frame rate
765 and a small GOP size. This is especially true for RealVideo where
766 the Linux player does not seem to be very fast, so it can miss
767 frames. An example is:
770 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
774 The parameter 'q' which is displayed while encoding is the current
775 quantizer. The value 1 indicates that a very good quality could
776 be achieved. The value 31 indicates the worst quality. If q=31 appears
777 too often, it means that the encoder cannot compress enough to meet
778 your bitrate. You must either increase the bitrate, decrease the
779 frame rate or decrease the frame size.
782 If your computer is not fast enough, you can speed up the
783 compression at the expense of the compression ratio. You can use
784 '-me zero' to speed up motion estimation, and '-intra' to disable
785 motion estimation completely (you have only I-frames, which means it
786 is about as good as JPEG compression).
789 To have very low audio bitrates, reduce the sampling frequency
790 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
793 To have a constant quality (but a variable bitrate), use the option
794 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
798 When converting video files, you can use the '-sameq' option which
799 uses the same quality factor in the encoder as in the decoder.
800 It allows almost lossless encoding.
806 @c man begin EXAMPLES
808 @section Video and Audio grabbing
810 FFmpeg can grab video and audio from devices given that you specify the input
814 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
817 Note that you must activate the right video source and channel before
818 launching FFmpeg with any TV viewer such as xawtv
819 (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
820 have to set the audio recording levels correctly with a
823 @section X11 grabbing
825 FFmpeg can grab the X11 display.
828 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
831 0.0 is display.screen number of your X11 server, same as
832 the DISPLAY environment variable.
835 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
838 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
839 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
841 @section Video and Audio file format conversion
843 FFmpeg can use any supported file format and protocol as input:
848 You can use YUV files as input:
851 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
854 It will use the files:
856 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
857 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
860 The Y files use twice the resolution of the U and V files. They are
861 raw files, without header. They can be generated by all decent video
862 decoders. You must specify the size of the image with the @option{-s} option
863 if FFmpeg cannot guess it.
866 You can input from a raw YUV420P file:
869 ffmpeg -i /tmp/test.yuv /tmp/out.avi
872 test.yuv is a file containing raw YUV planar data. Each frame is composed
873 of the Y plane followed by the U and V planes at half vertical and
874 horizontal resolution.
877 You can output to a raw YUV420P file:
880 ffmpeg -i mydivx.avi hugefile.yuv
884 You can set several input files and output files:
887 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
890 Converts the audio file a.wav and the raw YUV video file a.yuv
894 You can also do audio and video conversions at the same time:
897 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
900 Converts a.wav to MPEG audio at 22050 Hz sample rate.
903 You can encode to several formats at the same time and define a
904 mapping from input stream to output streams:
907 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
910 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
911 file:index' specifies which input stream is used for each output
912 stream, in the order of the definition of output streams.
915 You can transcode decrypted VOBs:
918 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
921 This is a typical DVD ripping example; the input is a VOB file, the
922 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
923 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
924 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
925 input video. Furthermore, the audio stream is MP3-encoded so you need
926 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
927 The mapping is particularly useful for DVD transcoding
928 to get the desired audio language.
930 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
933 You can extract images from a video, or create a video from many images:
935 For extracting images from a video:
937 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
940 This will extract one video frame per second from the video and will
941 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
942 etc. Images will be rescaled to fit the new WxH values.
944 If you want to extract just a limited number of frames, you can use the
945 above command in combination with the -vframes or -t option, or in
946 combination with -ss to start extracting from a certain point in time.
948 For creating a video from many images:
950 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
953 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
954 composed of three digits padded with zeroes to express the sequence
955 number. It is the same syntax supported by the C printf function, but
956 only formats accepting a normal integer are suitable.
959 You can put many streams of the same type in the output:
962 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
965 In addition to the first video and audio streams, the resulting
966 output file @file{test12.avi} will contain the second video
967 and the second audio stream found in the input streams list.
969 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
970 options have to be specified immediately after the name of the output
971 file to which you want to add them.
977 @include demuxers.texi
979 @include outdevs.texi
980 @include protocols.texi
981 @include bitstream_filters.texi
982 @include filters.texi
983 @include metadata.texi
988 @settitle FFmpeg video converter
991 ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
995 The FFmpeg developers