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.
39 * To set the video bitrate of the output file to 64kbit/s:
41 ffmpeg -i input.avi -b 64k output.avi
44 * To force the frame rate of the output file to 24 fps:
46 ffmpeg -i input.avi -r 24 output.avi
49 * To force the frame rate of the input file (valid for raw formats only)
50 to 1 fps and the frame rate of the output file to 24 fps:
52 ffmpeg -r 1 -i input.m2v -r 24 output.avi
55 The format option may be needed for raw input files.
57 By default, FFmpeg tries to convert as losslessly as possible: It
58 uses the same audio and video parameters for the outputs as the one
59 specified for the inputs.
61 @c man end DESCRIPTION
66 @include fftools-common-opts.texi
75 @item -i @var{filename}
79 Overwrite output files.
81 @item -t @var{duration}
82 Restrict the transcoded/captured video sequence
83 to the duration specified in seconds.
84 @code{hh:mm:ss[.xxx]} syntax is also supported.
86 @item -fs @var{limit_size}
87 Set the file size limit.
89 @item -ss @var{position}
90 Seek to given time position in seconds.
91 @code{hh:mm:ss[.xxx]} syntax is also supported.
93 @item -itsoffset @var{offset}
94 Set the input time offset in seconds.
95 @code{[-]hh:mm:ss[.xxx]} syntax is also supported.
96 This option affects all the input files that follow it.
97 The offset is added to the timestamps of the input files.
98 Specifying a positive offset means that the corresponding
99 streams are delayed by 'offset' seconds.
101 @item -timestamp @var{time}
102 Set the recording timestamp in the container.
103 The syntax for @var{time} is:
105 now|([(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH[:MM[:SS[.m...]]])|(HH[MM[SS[.m...]]]))[Z|z])
107 If the value is "now" it takes the current time.
108 Time is local time unless 'Z' or 'z' is appended, in which case it is
110 If the year-month-day part is not specified it takes the current
113 @item -metadata @var{key}=@var{value}
114 Set a metadata key/value pair.
116 For example, for setting the title in the output file:
118 ffmpeg -i in.avi -metadata title="my title" out.flv
121 @item -v @var{number}
122 Set the logging verbosity level.
124 @item -target @var{type}
125 Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
126 "ntsc-svcd", ... ). All the format options (bitrate, codecs,
127 buffer sizes) are then set automatically. You can just type:
130 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
133 Nevertheless you can specify additional options as long as you know
134 they do not conflict with the standard, as in:
137 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
140 @item -dframes @var{number}
141 Set the number of data frames to record.
143 @item -scodec @var{codec}
144 Force subtitle codec ('copy' to copy stream).
147 Add a new subtitle stream to the current output stream.
149 @item -slang @var{code}
150 Set the ISO 639 language code (3 letters) of the current subtitle stream.
154 @section Video Options
157 @item -b @var{bitrate}
158 Set the video bitrate in bit/s (default = 200 kb/s).
159 @item -vframes @var{number}
160 Set the number of video frames to record.
162 Set frame rate (Hz value, fraction or abbreviation), (default = 25).
164 Set frame size. The format is @samp{wxh} (ffserver default = 160x128, ffmpeg default = same as source).
165 The following abbreviations are recognized:
227 @item -aspect @var{aspect}
228 Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
229 @item -croptop @var{size}
230 @item -cropbottom @var{size}
231 @item -cropleft @var{size}
232 @item -cropright @var{size}
233 All the crop options have been removed. Use -vf
234 crop=width:height:x:y instead.
236 @item -padtop @var{size}
237 @item -padbottom @var{size}
238 @item -padleft @var{size}
239 @item -padright @var{size}
240 @item -padcolor @var{hex_color}
241 All the pad options have been removed. Use -vf
242 pad=width:height:x:y:color instead.
244 Disable video recording.
245 @item -bt @var{tolerance}
246 Set video bitrate tolerance (in bits, default 4000k).
247 Has a minimum value of: (target_bitrate/target_framerate).
248 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
249 willing to deviate from the target average bitrate value. This is
250 not related to min/max bitrate. Lowering tolerance too much has
251 an adverse effect on quality.
252 @item -maxrate @var{bitrate}
253 Set max video bitrate (in bit/s).
254 Requires -bufsize to be set.
255 @item -minrate @var{bitrate}
256 Set min video bitrate (in bit/s).
257 Most useful in setting up a CBR encode:
259 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
261 It is of little use elsewise.
262 @item -bufsize @var{size}
263 Set video buffer verifier buffer size (in bits).
264 @item -vcodec @var{codec}
265 Force video codec to @var{codec}. Use the @code{copy} special value to
266 tell that the raw codec data must be copied as is.
268 Use same video quality as source (implies VBR).
271 Select the pass number (1 or 2). It is used to do two-pass
272 video encoding. The statistics of the video are recorded in the first
273 pass into a log file (see also the option -passlogfile),
274 and in the second pass that log file is used to generate the video
275 at the exact requested bitrate.
276 On pass 1, you may just deactivate audio and set output to null,
277 examples for Windows and Unix:
279 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
280 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
283 @item -passlogfile @var{prefix}
284 Set two-pass log file name prefix to @var{prefix}, the default file name
285 prefix is ``ffmpeg2pass''. The complete file name will be
286 @file{PREFIX-N.log}, where N is a number specific to the output
290 Add a new video stream to the current output stream.
292 @item -vlang @var{code}
293 Set the ISO 639 language code (3 letters) of the current video stream.
295 @item -vf @var{filter_graph}
296 @var{filter_graph} is a description of the filter graph to apply to
298 Use the option "-filters" to show all the available filters (including
299 also sources and sinks).
303 @section Advanced Video Options
306 @item -pix_fmt @var{format}
307 Set pixel format. Use 'list' as parameter to show all the supported
309 @item -sws_flags @var{flags}
311 @item -g @var{gop_size}
312 Set the group of pictures size.
314 Use only intra frames.
317 @item -qscale @var{q}
318 Use fixed video quantizer scale (VBR).
320 minimum video quantizer scale (VBR)
322 maximum video quantizer scale (VBR)
324 maximum difference between the quantizer scales (VBR)
325 @item -qblur @var{blur}
326 video quantizer scale blur (VBR) (range 0.0 - 1.0)
327 @item -qcomp @var{compression}
328 video quantizer scale compression (VBR) (default 0.5).
329 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
331 @item -lmin @var{lambda}
332 minimum video lagrange factor (VBR)
333 @item -lmax @var{lambda}
334 max video lagrange factor (VBR)
335 @item -mblmin @var{lambda}
336 minimum macroblock quantizer scale (VBR)
337 @item -mblmax @var{lambda}
338 maximum macroblock quantizer scale (VBR)
340 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
341 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
343 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
346 @item -rc_init_cplx @var{complexity}
347 initial complexity for single pass encoding
348 @item -b_qfactor @var{factor}
349 qp factor between P- and B-frames
350 @item -i_qfactor @var{factor}
351 qp factor between P- and I-frames
352 @item -b_qoffset @var{offset}
353 qp offset between P- and B-frames
354 @item -i_qoffset @var{offset}
355 qp offset between P- and I-frames
356 @item -rc_eq @var{equation}
357 Set rate control equation (see section "Expression Evaluation")
358 (default = @code{tex^qComp}).
360 When computing the rate control equation expression, besides the
361 standard functions defined in the section "Expression Evaluation", the
362 following functions are available:
368 and the following constants are available:
390 @item -rc_override @var{override}
391 rate control override for specific intervals
392 @item -me_method @var{method}
393 Set motion estimation method to @var{method}.
394 Available methods are (from lowest to best quality):
397 Try just the (0, 0) vector.
406 exhaustive search (slow and marginally better than epzs)
409 @item -dct_algo @var{algo}
410 Set DCT algorithm to @var{algo}. Available values are:
413 FF_DCT_AUTO (default)
426 @item -idct_algo @var{algo}
427 Set IDCT algorithm to @var{algo}. Available values are:
430 FF_IDCT_AUTO (default)
454 Set error resilience to @var{n}.
457 FF_ER_CAREFUL (default)
463 FF_ER_VERY_AGGRESSIVE
466 @item -ec @var{bit_mask}
467 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
468 the following values:
471 FF_EC_GUESS_MVS (default = enabled)
473 FF_EC_DEBLOCK (default = enabled)
476 @item -bf @var{frames}
477 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
478 @item -mbd @var{mode}
482 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).
484 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
486 FF_MB_DECISION_RD: rate distortion
490 Use four motion vector by macroblock (MPEG-4 only).
492 Use data partitioning (MPEG-4 only).
493 @item -bug @var{param}
494 Work around encoder bugs that are not auto-detected.
495 @item -strict @var{strictness}
496 How strictly to follow the standards.
498 Enable Advanced intra coding (h263+).
500 Enable Unlimited Motion Vector (h263+)
503 Deinterlace pictures.
505 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
506 Use this option if your input file is interlaced and you want
507 to keep the interlaced format for minimum losses.
508 The alternative is to deinterlace the input stream with
509 @option{-deinterlace}, but deinterlacing introduces losses.
511 Calculate PSNR of compressed frames.
513 Dump video coding statistics to @file{vstats_HHMMSS.log}.
514 @item -vstats_file @var{file}
515 Dump video coding statistics to @var{file}.
517 top=1/bottom=0/auto=-1 field first
518 @item -dc @var{precision}
520 @item -vtag @var{fourcc/tag}
521 Force video tag/fourcc.
524 @item -vbsf @var{bitstream_filter}
525 Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
527 ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
529 @item -force_key_frames @var{time}[,@var{time}...]
530 Force key frames at the specified timestamps, more precisely at the first
531 frames after each specified time.
532 This option can be useful to ensure that a seek point is present at a
533 chapter mark or any other designated place in the output file.
534 The timestamps must be specified in ascending order.
537 @section Audio Options
540 @item -aframes @var{number}
541 Set the number of audio frames to record.
543 Set the audio sampling frequency (default = 44100 Hz).
544 @item -ab @var{bitrate}
545 Set the audio bitrate in bit/s (default = 64k).
547 Set the audio quality (codec-specific, VBR).
548 @item -ac @var{channels}
549 Set the number of audio channels. For input streams it is set by
550 default to 1, for output streams it is set by default to the same
551 number of audio channels in input. If the input file has audio streams
552 with different channel count, the behaviour is undefined.
554 Disable audio recording.
555 @item -acodec @var{codec}
556 Force audio codec to @var{codec}. Use the @code{copy} special value to
557 specify that the raw codec data must be copied as is.
559 Add a new audio track to the output file. If you want to specify parameters,
560 do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
562 Mapping will be done automatically, if the number of output streams is equal to
563 the number of input streams, else it will pick the first one that matches. You
564 can override the mapping using @code{-map} as usual.
568 ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
570 @item -alang @var{code}
571 Set the ISO 639 language code (3 letters) of the current audio stream.
574 @section Advanced Audio options:
577 @item -atag @var{fourcc/tag}
578 Force audio tag/fourcc.
579 @item -absf @var{bitstream_filter}
580 Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
583 @section Subtitle options:
586 @item -scodec @var{codec}
587 Force subtitle codec ('copy' to copy stream).
589 Add a new subtitle stream to the current output stream.
590 @item -slang @var{code}
591 Set the ISO 639 language code (3 letters) of the current subtitle stream.
593 Disable subtitle recording.
594 @item -sbsf @var{bitstream_filter}
595 Bitstream filters available are "mov2textsub", "text2movsub".
597 ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
601 @section Audio/Video grab options
604 @item -vc @var{channel}
605 Set video grab channel (DV1394 only).
606 @item -tvstd @var{standard}
607 Set television standard (NTSC, PAL (SECAM)).
609 Synchronize read on input.
612 @section Advanced options
615 @item -map @var{input_stream_id}[:@var{sync_stream_id}]
616 Set stream mapping from input streams to output streams.
617 Just enumerate the input streams in the order you want them in the output.
618 @var{sync_stream_id} if specified sets the input stream to sync
620 @item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
621 Set meta data information of @var{outfile} from @var{infile}. Note that those
622 are file indices (zero-based), not filenames.
623 Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
624 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
625 per-(p)rogram. All metadata specifiers other than global must be followed by the
626 stream/chapter/program number. If metadata specifier is omitted, it defaults to
629 By default, global metadata is copied from the first input file to all output files,
630 per-stream and per-chapter metadata is copied along with streams/chapters. These
631 default mappings are disabled by creating any mapping of the relevant type. A negative
632 file index can be used to create a dummy mapping that just disables automatic copying.
634 For example to copy metadata from the first stream of the input file to global metadata
637 ffmpeg -i in.ogg -map_meta_data 0:0,s0 out.mp3
639 @item -map_chapters @var{outfile}:@var{infile}
640 Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
641 then chapters are copied from the first input file with at least one chapter to all
642 output files. Use a negative file index to disable any chapter copying.
644 Print specific debug info.
646 Show benchmarking information at the end of an encode.
647 Shows CPU time used and maximum memory consumption.
648 Maximum memory consumption is not supported on all systems,
649 it will usually display as 0 if not supported.
651 Dump each input packet.
653 When dumping packets, also dump the payload.
655 Only use bit exact algorithms (for codec testing).
657 Set RTP payload size in bytes.
659 Read input at native frame rate. Mainly used to simulate a grab device.
661 Loop over the input stream. Currently it works only for image
662 streams. This option is used for automatic FFserver testing.
663 @item -loop_output @var{number_of_times}
664 Repeatedly loop output for formats that support looping such as animated GIF
665 (0 will loop the output infinitely).
666 @item -threads @var{count}
668 @item -vsync @var{parameter}
670 0 Each frame is passed with its timestamp from the demuxer to the muxer
671 1 Frames will be duplicated and dropped to achieve exactly the requested
673 2 Frames are passed through with their timestamp or dropped so as to prevent
674 2 frames from having the same timestamp
675 -1 Chooses between 1 and 2 depending on muxer capabilities. This is the default method.
677 With -map you can select from
678 which stream the timestamps should be taken. You can leave either video or
679 audio unchanged and sync the remaining stream(s) to the unchanged one.
680 @item -async @var{samples_per_second}
681 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
682 the parameter is the maximum samples per second by which the audio is changed.
683 -async 1 is a special case where only the start of the audio stream is corrected
684 without any later correction.
686 Copy timestamps from input to output.
688 Finish encoding when the shortest input stream ends.
689 @item -dts_delta_threshold
690 Timestamp discontinuity delta threshold.
691 @item -muxdelay @var{seconds}
692 Set the maximum demux-decode delay.
693 @item -muxpreload @var{seconds}
694 Set the initial demux-decode delay.
695 @item -streamid @var{output-stream-index}:@var{new-value}
696 Assign a new value to a stream's stream-id field in the next output file.
697 All stream-id fields are reset to default for each output file.
699 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
700 an output mpegts file:
702 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
706 @section Preset files
708 A preset file contains a sequence of @var{option}=@var{value} pairs,
709 one for each line, specifying a sequence of options which would be
710 awkward to specify on the command line. Lines starting with the hash
711 ('#') character are ignored and are used to provide comments. Check
712 the @file{ffpresets} directory in the FFmpeg source tree for examples.
714 Preset files are specified with the @code{vpre}, @code{apre},
715 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
716 filename of the preset instead of a preset name as input and can be
717 used for any kind of codec. For the @code{vpre}, @code{apre}, and
718 @code{spre} options, the options specified in a preset file are
719 applied to the currently selected codec of the same type as the preset
722 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
723 preset options identifies the preset file to use according to the
726 First ffmpeg searches for a file named @var{arg}.ffpreset in the
727 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
728 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
729 in that order. For example, if the argument is @code{libx264-max}, it will
730 search for the file @file{libx264-max.ffpreset}.
732 If no such file is found, then ffmpeg will search for a file named
733 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
734 directories, where @var{codec_name} is the name of the codec to which
735 the preset file options will be applied. For example, if you select
736 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
737 then it will search for the file @file{libx264-max.ffpreset}.
745 For streaming at very low bitrate application, use a low frame rate
746 and a small GOP size. This is especially true for RealVideo where
747 the Linux player does not seem to be very fast, so it can miss
748 frames. An example is:
751 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
755 The parameter 'q' which is displayed while encoding is the current
756 quantizer. The value 1 indicates that a very good quality could
757 be achieved. The value 31 indicates the worst quality. If q=31 appears
758 too often, it means that the encoder cannot compress enough to meet
759 your bitrate. You must either increase the bitrate, decrease the
760 frame rate or decrease the frame size.
763 If your computer is not fast enough, you can speed up the
764 compression at the expense of the compression ratio. You can use
765 '-me zero' to speed up motion estimation, and '-intra' to disable
766 motion estimation completely (you have only I-frames, which means it
767 is about as good as JPEG compression).
770 To have very low audio bitrates, reduce the sampling frequency
771 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
774 To have a constant quality (but a variable bitrate), use the option
775 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
779 When converting video files, you can use the '-sameq' option which
780 uses the same quality factor in the encoder as in the decoder.
781 It allows almost lossless encoding.
787 @c man begin EXAMPLES
789 @section Video and Audio grabbing
791 FFmpeg can grab video and audio from devices given that you specify the input
795 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
798 Note that you must activate the right video source and channel before
799 launching FFmpeg with any TV viewer such as xawtv
800 (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
801 have to set the audio recording levels correctly with a
804 @section X11 grabbing
806 FFmpeg can grab the X11 display.
809 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
812 0.0 is display.screen number of your X11 server, same as
813 the DISPLAY environment variable.
816 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
819 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
820 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
822 @section Video and Audio file format conversion
824 * FFmpeg can use any supported file format and protocol as input:
828 * You can use YUV files as input:
831 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
834 It will use the files:
836 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
837 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
840 The Y files use twice the resolution of the U and V files. They are
841 raw files, without header. They can be generated by all decent video
842 decoders. You must specify the size of the image with the @option{-s} option
843 if FFmpeg cannot guess it.
845 * You can input from a raw YUV420P file:
848 ffmpeg -i /tmp/test.yuv /tmp/out.avi
851 test.yuv is a file containing raw YUV planar data. Each frame is composed
852 of the Y plane followed by the U and V planes at half vertical and
853 horizontal resolution.
855 * You can output to a raw YUV420P file:
858 ffmpeg -i mydivx.avi hugefile.yuv
861 * You can set several input files and output files:
864 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
867 Converts the audio file a.wav and the raw YUV video file a.yuv
870 * You can also do audio and video conversions at the same time:
873 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
876 Converts a.wav to MPEG audio at 22050 Hz sample rate.
878 * You can encode to several formats at the same time and define a
879 mapping from input stream to output streams:
882 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
885 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
886 file:index' specifies which input stream is used for each output
887 stream, in the order of the definition of output streams.
889 * You can transcode decrypted VOBs:
892 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
895 This is a typical DVD ripping example; the input is a VOB file, the
896 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
897 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
898 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
899 input video. Furthermore, the audio stream is MP3-encoded so you need
900 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
901 The mapping is particularly useful for DVD transcoding
902 to get the desired audio language.
904 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
906 * You can extract images from a video, or create a video from many images:
908 For extracting images from a video:
910 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
913 This will extract one video frame per second from the video and will
914 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
915 etc. Images will be rescaled to fit the new WxH values.
917 If you want to extract just a limited number of frames, you can use the
918 above command in combination with the -vframes or -t option, or in
919 combination with -ss to start extracting from a certain point in time.
921 For creating a video from many images:
923 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
926 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
927 composed of three digits padded with zeroes to express the sequence
928 number. It is the same syntax supported by the C printf function, but
929 only formats accepting a normal integer are suitable.
931 * You can put many streams of the same type in the output:
934 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
937 In addition to the first video and audio streams, the resulting
938 output file @file{test12.avi} will contain the second video
939 and the second audio stream found in the input streams list.
941 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
942 options have to be specified immediately after the name of the output
943 file to which you want to add them.
947 @include demuxers.texi
949 @include outdevs.texi
950 @include protocols.texi
951 @include bitstream_filters.texi
952 @include filters.texi
953 @include metadata.texi
958 @settitle FFmpeg video converter
961 ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
965 The FFmpeg developers