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 -audio_service_type @var{type}
590 Set the type of service that the audio stream contains.
593 Main Audio Service (default)
611 @item -absf @var{bitstream_filter}
612 Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
615 @section Subtitle options:
618 @item -scodec @var{codec}
619 Force subtitle codec ('copy' to copy stream).
621 Add a new subtitle stream to the current output stream.
622 @item -slang @var{code}
623 Set the ISO 639 language code (3 letters) of the current subtitle stream.
625 Disable subtitle recording.
626 @item -sbsf @var{bitstream_filter}
627 Bitstream filters available are "mov2textsub", "text2movsub".
629 ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
633 @section Audio/Video grab options
636 @item -vc @var{channel}
637 Set video grab channel (DV1394 only).
638 @item -tvstd @var{standard}
639 Set television standard (NTSC, PAL (SECAM)).
641 Synchronize read on input.
644 @section Advanced options
647 @item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
649 Designate an input stream as a source for the output file. Each input
650 stream is identified by the input file index @var{input_file_id} and
651 the input stream index @var{input_stream_id} within the input
652 file. Both indexes start at 0. If specified,
653 @var{sync_file_id}.@var{sync_stream_id} sets which input stream
654 is used as a presentation sync reference.
656 The @code{-map} options must be specified just after the output file.
657 If any @code{-map} options are used, the number of @code{-map} options
658 on the command line must match the number of streams in the output
659 file. The first @code{-map} option on the command line specifies the
660 source for output stream 0, the second @code{-map} option specifies
661 the source for output stream 1, etc.
663 For example, if you have two audio streams in the first input file,
664 these streams are identified by "0.0" and "0.1". You can use
665 @code{-map} to select which stream to place in an output file. For
668 ffmpeg -i INPUT out.wav -map 0.1
670 will map the input stream in @file{INPUT} identified by "0.1" to
671 the (single) output stream in @file{out.wav}.
673 For example, to select the stream with index 2 from input file
674 @file{a.mov} (specified by the identifier "0.2"), and stream with
675 index 6 from input @file{b.mov} (specified by the identifier "1.6"),
676 and copy them to the output file @file{out.mov}:
678 ffmpeg -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
681 To add more streams to the output file, you can use the
682 @code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
684 @item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
685 Deprecated, use @var{-map_metadata} instead.
687 @item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
688 Set metadata information of @var{outfile} from @var{infile}. Note that those
689 are file indices (zero-based), not filenames.
690 Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
691 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
692 per-(p)rogram. All metadata specifiers other than global must be followed by the
693 stream/chapter/program number. If metadata specifier is omitted, it defaults to
696 By default, global metadata is copied from the first input file to all output files,
697 per-stream and per-chapter metadata is copied along with streams/chapters. These
698 default mappings are disabled by creating any mapping of the relevant type. A negative
699 file index can be used to create a dummy mapping that just disables automatic copying.
701 For example to copy metadata from the first stream of the input file to global metadata
704 ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
706 @item -map_chapters @var{outfile}:@var{infile}
707 Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
708 then chapters are copied from the first input file with at least one chapter to all
709 output files. Use a negative file index to disable any chapter copying.
711 Print specific debug info.
713 Show benchmarking information at the end of an encode.
714 Shows CPU time used and maximum memory consumption.
715 Maximum memory consumption is not supported on all systems,
716 it will usually display as 0 if not supported.
718 Dump each input packet.
720 When dumping packets, also dump the payload.
722 Only use bit exact algorithms (for codec testing).
724 Set RTP payload size in bytes.
726 Read input at native frame rate. Mainly used to simulate a grab device.
728 Loop over the input stream. Currently it works only for image
729 streams. This option is used for automatic FFserver testing.
730 @item -loop_output @var{number_of_times}
731 Repeatedly loop output for formats that support looping such as animated GIF
732 (0 will loop the output infinitely).
733 @item -threads @var{count}
735 @item -vsync @var{parameter}
740 Each frame is passed with its timestamp from the demuxer to the muxer.
742 Frames will be duplicated and dropped to achieve exactly the requested
745 Frames are passed through with their timestamp or dropped so as to
746 prevent 2 frames from having the same timestamp.
748 Chooses between 1 and 2 depending on muxer capabilities. This is the
752 With -map you can select from which stream the timestamps should be
753 taken. You can leave either video or audio unchanged and sync the
754 remaining stream(s) to the unchanged one.
756 @item -async @var{samples_per_second}
757 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
758 the parameter is the maximum samples per second by which the audio is changed.
759 -async 1 is a special case where only the start of the audio stream is corrected
760 without any later correction.
762 Copy timestamps from input to output.
764 Copy input stream time base from input to output when stream copying.
766 Finish encoding when the shortest input stream ends.
767 @item -dts_delta_threshold
768 Timestamp discontinuity delta threshold.
769 @item -muxdelay @var{seconds}
770 Set the maximum demux-decode delay.
771 @item -muxpreload @var{seconds}
772 Set the initial demux-decode delay.
773 @item -streamid @var{output-stream-index}:@var{new-value}
774 Assign a new stream-id value to an output stream. This option should be
775 specified prior to the output filename to which it applies.
776 For the situation where multiple output files exist, a streamid
777 may be reassigned to a different value.
779 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
780 an output mpegts file:
782 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
786 @section Preset files
788 A preset file contains a sequence of @var{option}=@var{value} pairs,
789 one for each line, specifying a sequence of options which would be
790 awkward to specify on the command line. Lines starting with the hash
791 ('#') character are ignored and are used to provide comments. Check
792 the @file{ffpresets} directory in the Libav source tree for examples.
794 Preset files are specified with the @code{vpre}, @code{apre},
795 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
796 filename of the preset instead of a preset name as input and can be
797 used for any kind of codec. For the @code{vpre}, @code{apre}, and
798 @code{spre} options, the options specified in a preset file are
799 applied to the currently selected codec of the same type as the preset
802 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
803 preset options identifies the preset file to use according to the
806 First ffmpeg searches for a file named @var{arg}.ffpreset in the
807 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
808 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
809 in that order. For example, if the argument is @code{libx264-max}, it will
810 search for the file @file{libx264-max.ffpreset}.
812 If no such file is found, then ffmpeg will search for a file named
813 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
814 directories, where @var{codec_name} is the name of the codec to which
815 the preset file options will be applied. For example, if you select
816 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
817 then it will search for the file @file{libx264-max.ffpreset}.
825 For streaming at very low bitrate application, use a low frame rate
826 and a small GOP size. This is especially true for RealVideo where
827 the Linux player does not seem to be very fast, so it can miss
828 frames. An example is:
831 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
835 The parameter 'q' which is displayed while encoding is the current
836 quantizer. The value 1 indicates that a very good quality could
837 be achieved. The value 31 indicates the worst quality. If q=31 appears
838 too often, it means that the encoder cannot compress enough to meet
839 your bitrate. You must either increase the bitrate, decrease the
840 frame rate or decrease the frame size.
843 If your computer is not fast enough, you can speed up the
844 compression at the expense of the compression ratio. You can use
845 '-me zero' to speed up motion estimation, and '-intra' to disable
846 motion estimation completely (you have only I-frames, which means it
847 is about as good as JPEG compression).
850 To have very low audio bitrates, reduce the sampling frequency
851 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
854 To have a constant quality (but a variable bitrate), use the option
855 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
859 When converting video files, you can use the '-sameq' option which
860 uses the same quality factor in the encoder as in the decoder.
861 It allows almost lossless encoding.
867 @c man begin EXAMPLES
869 @section Video and Audio grabbing
871 FFmpeg can grab video and audio from devices given that you specify the input
875 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
878 Note that you must activate the right video source and channel before
879 launching FFmpeg with any TV viewer such as xawtv
880 (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
881 have to set the audio recording levels correctly with a
884 @section X11 grabbing
886 FFmpeg can grab the X11 display.
889 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
892 0.0 is display.screen number of your X11 server, same as
893 the DISPLAY environment variable.
896 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
899 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
900 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
902 @section Video and Audio file format conversion
904 FFmpeg can use any supported file format and protocol as input:
909 You can use YUV files as input:
912 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
915 It will use the files:
917 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
918 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
921 The Y files use twice the resolution of the U and V files. They are
922 raw files, without header. They can be generated by all decent video
923 decoders. You must specify the size of the image with the @option{-s} option
924 if FFmpeg cannot guess it.
927 You can input from a raw YUV420P file:
930 ffmpeg -i /tmp/test.yuv /tmp/out.avi
933 test.yuv is a file containing raw YUV planar data. Each frame is composed
934 of the Y plane followed by the U and V planes at half vertical and
935 horizontal resolution.
938 You can output to a raw YUV420P file:
941 ffmpeg -i mydivx.avi hugefile.yuv
945 You can set several input files and output files:
948 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
951 Converts the audio file a.wav and the raw YUV video file a.yuv
955 You can also do audio and video conversions at the same time:
958 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
961 Converts a.wav to MPEG audio at 22050 Hz sample rate.
964 You can encode to several formats at the same time and define a
965 mapping from input stream to output streams:
968 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
971 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
972 file:index' specifies which input stream is used for each output
973 stream, in the order of the definition of output streams.
976 You can transcode decrypted VOBs:
979 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
982 This is a typical DVD ripping example; the input is a VOB file, the
983 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
984 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
985 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
986 input video. Furthermore, the audio stream is MP3-encoded so you need
987 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
988 The mapping is particularly useful for DVD transcoding
989 to get the desired audio language.
991 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
994 You can extract images from a video, or create a video from many images:
996 For extracting images from a video:
998 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1001 This will extract one video frame per second from the video and will
1002 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1003 etc. Images will be rescaled to fit the new WxH values.
1005 If you want to extract just a limited number of frames, you can use the
1006 above command in combination with the -vframes or -t option, or in
1007 combination with -ss to start extracting from a certain point in time.
1009 For creating a video from many images:
1011 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1014 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1015 composed of three digits padded with zeroes to express the sequence
1016 number. It is the same syntax supported by the C printf function, but
1017 only formats accepting a normal integer are suitable.
1020 You can put many streams of the same type in the output:
1023 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
1026 In addition to the first video and audio streams, the resulting
1027 output file @file{test12.avi} will contain the second video
1028 and the second audio stream found in the input streams list.
1030 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
1031 options have to be specified immediately after the name of the output
1032 file to which you want to add them.
1038 @include encoders.texi
1039 @include demuxers.texi
1040 @include muxers.texi
1041 @include indevs.texi
1042 @include outdevs.texi
1043 @include protocols.texi
1044 @include bitstream_filters.texi
1045 @include filters.texi
1046 @include metadata.texi
1051 @settitle FFmpeg video converter
1053 @c man begin SEEALSO
1054 ffplay(1), ffprobe(1), ffserver(1) and the Libav HTML documentation
1057 @c man begin AUTHORS
1058 The Libav developers