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).
172 There is no default for input streams,
173 for output streams it is set by default to the size of the source stream.
174 If the input file has video streams with different resolutions, the behaviour is undefined.
175 The following abbreviations are recognized:
237 @item -aspect @var{aspect}
238 Set the video display aspect ratio specified by @var{aspect}.
240 @var{aspect} can be a floating point number string, or a string of the
241 form @var{num}:@var{den}, where @var{num} and @var{den} are the
242 numerator and denominator of the aspect ratio. For example "4:3",
243 "16:9", "1.3333", and "1.7777" are valid argument values.
245 @item -croptop @var{size}
246 @item -cropbottom @var{size}
247 @item -cropleft @var{size}
248 @item -cropright @var{size}
249 All the crop options have been removed. Use -vf
250 crop=width:height:x:y instead.
252 @item -padtop @var{size}
253 @item -padbottom @var{size}
254 @item -padleft @var{size}
255 @item -padright @var{size}
256 @item -padcolor @var{hex_color}
257 All the pad options have been removed. Use -vf
258 pad=width:height:x:y:color instead.
260 Disable video recording.
261 @item -bt @var{tolerance}
262 Set video bitrate tolerance (in bits, default 4000k).
263 Has a minimum value of: (target_bitrate/target_framerate).
264 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
265 willing to deviate from the target average bitrate value. This is
266 not related to min/max bitrate. Lowering tolerance too much has
267 an adverse effect on quality.
268 @item -maxrate @var{bitrate}
269 Set max video bitrate (in bit/s).
270 Requires -bufsize to be set.
271 @item -minrate @var{bitrate}
272 Set min video bitrate (in bit/s).
273 Most useful in setting up a CBR encode:
275 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
277 It is of little use elsewise.
278 @item -bufsize @var{size}
279 Set video buffer verifier buffer size (in bits).
280 @item -vcodec @var{codec}
281 Force video codec to @var{codec}. Use the @code{copy} special value to
282 tell that the raw codec data must be copied as is.
284 Use same quantizer as source (implies VBR).
287 Select the pass number (1 or 2). It is used to do two-pass
288 video encoding. The statistics of the video are recorded in the first
289 pass into a log file (see also the option -passlogfile),
290 and in the second pass that log file is used to generate the video
291 at the exact requested bitrate.
292 On pass 1, you may just deactivate audio and set output to null,
293 examples for Windows and Unix:
295 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
296 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
299 @item -passlogfile @var{prefix}
300 Set two-pass log file name prefix to @var{prefix}, the default file name
301 prefix is ``ffmpeg2pass''. The complete file name will be
302 @file{PREFIX-N.log}, where N is a number specific to the output
306 Add a new video stream to the current output stream.
308 @item -vlang @var{code}
309 Set the ISO 639 language code (3 letters) of the current video stream.
311 @item -vf @var{filter_graph}
312 @var{filter_graph} is a description of the filter graph to apply to
314 Use the option "-filters" to show all the available filters (including
315 also sources and sinks).
319 @section Advanced Video Options
322 @item -pix_fmt @var{format}
323 Set pixel format. Use 'list' as parameter to show all the supported
325 @item -sws_flags @var{flags}
327 @item -g @var{gop_size}
328 Set the group of pictures size.
330 Use only intra frames.
333 @item -qscale @var{q}
334 Use fixed video quantizer scale (VBR).
336 minimum video quantizer scale (VBR)
338 maximum video quantizer scale (VBR)
340 maximum difference between the quantizer scales (VBR)
341 @item -qblur @var{blur}
342 video quantizer scale blur (VBR) (range 0.0 - 1.0)
343 @item -qcomp @var{compression}
344 video quantizer scale compression (VBR) (default 0.5).
345 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
347 @item -lmin @var{lambda}
348 minimum video lagrange factor (VBR)
349 @item -lmax @var{lambda}
350 max video lagrange factor (VBR)
351 @item -mblmin @var{lambda}
352 minimum macroblock quantizer scale (VBR)
353 @item -mblmax @var{lambda}
354 maximum macroblock quantizer scale (VBR)
356 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
357 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
359 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
362 @item -rc_init_cplx @var{complexity}
363 initial complexity for single pass encoding
364 @item -b_qfactor @var{factor}
365 qp factor between P- and B-frames
366 @item -i_qfactor @var{factor}
367 qp factor between P- and I-frames
368 @item -b_qoffset @var{offset}
369 qp offset between P- and B-frames
370 @item -i_qoffset @var{offset}
371 qp offset between P- and I-frames
372 @item -rc_eq @var{equation}
373 Set rate control equation (see section "Expression Evaluation")
374 (default = @code{tex^qComp}).
376 When computing the rate control equation expression, besides the
377 standard functions defined in the section "Expression Evaluation", the
378 following functions are available:
384 and the following constants are available:
406 @item -rc_override @var{override}
407 rate control override for specific intervals
408 @item -me_method @var{method}
409 Set motion estimation method to @var{method}.
410 Available methods are (from lowest to best quality):
413 Try just the (0, 0) vector.
422 exhaustive search (slow and marginally better than epzs)
425 @item -dct_algo @var{algo}
426 Set DCT algorithm to @var{algo}. Available values are:
429 FF_DCT_AUTO (default)
442 @item -idct_algo @var{algo}
443 Set IDCT algorithm to @var{algo}. Available values are:
446 FF_IDCT_AUTO (default)
470 Set error resilience to @var{n}.
473 FF_ER_CAREFUL (default)
479 FF_ER_VERY_AGGRESSIVE
482 @item -ec @var{bit_mask}
483 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
484 the following values:
487 FF_EC_GUESS_MVS (default = enabled)
489 FF_EC_DEBLOCK (default = enabled)
492 @item -bf @var{frames}
493 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
494 @item -mbd @var{mode}
498 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).
500 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
502 FF_MB_DECISION_RD: rate distortion
506 Use four motion vector by macroblock (MPEG-4 only).
508 Use data partitioning (MPEG-4 only).
509 @item -bug @var{param}
510 Work around encoder bugs that are not auto-detected.
511 @item -strict @var{strictness}
512 How strictly to follow the standards.
514 Enable Advanced intra coding (h263+).
516 Enable Unlimited Motion Vector (h263+)
519 Deinterlace pictures.
521 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
522 Use this option if your input file is interlaced and you want
523 to keep the interlaced format for minimum losses.
524 The alternative is to deinterlace the input stream with
525 @option{-deinterlace}, but deinterlacing introduces losses.
527 Calculate PSNR of compressed frames.
529 Dump video coding statistics to @file{vstats_HHMMSS.log}.
530 @item -vstats_file @var{file}
531 Dump video coding statistics to @var{file}.
533 top=1/bottom=0/auto=-1 field first
534 @item -dc @var{precision}
536 @item -vtag @var{fourcc/tag}
537 Force video tag/fourcc.
540 @item -vbsf @var{bitstream_filter}
541 Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
543 ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
545 @item -force_key_frames @var{time}[,@var{time}...]
546 Force key frames at the specified timestamps, more precisely at the first
547 frames after each specified time.
548 This option can be useful to ensure that a seek point is present at a
549 chapter mark or any other designated place in the output file.
550 The timestamps must be specified in ascending order.
553 @section Audio Options
556 @item -aframes @var{number}
557 Set the number of audio frames to record.
559 Set the audio sampling frequency. For input streams it is set by
560 default to 44100 Hz, for output streams it is set by default to the
561 frequency of the input stream. If the input file has audio streams
562 with different frequencies, the behaviour is undefined.
563 @item -ab @var{bitrate}
564 Set the audio bitrate in bit/s (default = 64k).
566 Set the audio quality (codec-specific, VBR).
567 @item -ac @var{channels}
568 Set the number of audio channels. For input streams it is set by
569 default to 1, for output streams it is set by default to the same
570 number of audio channels in input. If the input file has audio streams
571 with different channel count, the behaviour is undefined.
573 Disable audio recording.
574 @item -acodec @var{codec}
575 Force audio codec to @var{codec}. Use the @code{copy} special value to
576 specify that the raw codec data must be copied as is.
578 Add a new audio track to the output file. If you want to specify parameters,
579 do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
581 Mapping will be done automatically, if the number of output streams is equal to
582 the number of input streams, else it will pick the first one that matches. You
583 can override the mapping using @code{-map} as usual.
587 ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
589 @item -alang @var{code}
590 Set the ISO 639 language code (3 letters) of the current audio stream.
593 @section Advanced Audio options:
596 @item -atag @var{fourcc/tag}
597 Force audio tag/fourcc.
598 @item -audio_service_type @var{type}
599 Set the type of service that the audio stream contains.
602 Main Audio Service (default)
620 @item -absf @var{bitstream_filter}
621 Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
624 @section Subtitle options:
627 @item -scodec @var{codec}
628 Force subtitle codec ('copy' to copy stream).
630 Add a new subtitle stream to the current output stream.
631 @item -slang @var{code}
632 Set the ISO 639 language code (3 letters) of the current subtitle stream.
634 Disable subtitle recording.
635 @item -sbsf @var{bitstream_filter}
636 Bitstream filters available are "mov2textsub", "text2movsub".
638 ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
642 @section Audio/Video grab options
645 @item -vc @var{channel}
646 Set video grab channel (DV1394 only).
647 @item -tvstd @var{standard}
648 Set television standard (NTSC, PAL (SECAM)).
650 Synchronize read on input.
653 @section Advanced options
656 @item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
658 Designate an input stream as a source for the output file. Each input
659 stream is identified by the input file index @var{input_file_id} and
660 the input stream index @var{input_stream_id} within the input
661 file. Both indexes start at 0. If specified,
662 @var{sync_file_id}.@var{sync_stream_id} sets which input stream
663 is used as a presentation sync reference.
665 The @code{-map} options must be specified just after the output file.
666 If any @code{-map} options are used, the number of @code{-map} options
667 on the command line must match the number of streams in the output
668 file. The first @code{-map} option on the command line specifies the
669 source for output stream 0, the second @code{-map} option specifies
670 the source for output stream 1, etc.
672 For example, if you have two audio streams in the first input file,
673 these streams are identified by "0.0" and "0.1". You can use
674 @code{-map} to select which stream to place in an output file. For
677 ffmpeg -i INPUT out.wav -map 0.1
679 will map the input stream in @file{INPUT} identified by "0.1" to
680 the (single) output stream in @file{out.wav}.
682 For example, to select the stream with index 2 from input file
683 @file{a.mov} (specified by the identifier "0.2"), and stream with
684 index 6 from input @file{b.mov} (specified by the identifier "1.6"),
685 and copy them to the output file @file{out.mov}:
687 ffmpeg -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
690 To add more streams to the output file, you can use the
691 @code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
693 @item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
694 Deprecated, use @var{-map_metadata} instead.
696 @item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
697 Set metadata information of @var{outfile} from @var{infile}. Note that those
698 are file indices (zero-based), not filenames.
699 Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
700 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
701 per-(p)rogram. All metadata specifiers other than global must be followed by the
702 stream/chapter/program number. If metadata specifier is omitted, it defaults to
705 By default, global metadata is copied from the first input file to all output files,
706 per-stream and per-chapter metadata is copied along with streams/chapters. These
707 default mappings are disabled by creating any mapping of the relevant type. A negative
708 file index can be used to create a dummy mapping that just disables automatic copying.
710 For example to copy metadata from the first stream of the input file to global metadata
713 ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
715 @item -map_chapters @var{outfile}:@var{infile}
716 Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
717 then chapters are copied from the first input file with at least one chapter to all
718 output files. Use a negative file index to disable any chapter copying.
720 Print specific debug info.
722 Show benchmarking information at the end of an encode.
723 Shows CPU time used and maximum memory consumption.
724 Maximum memory consumption is not supported on all systems,
725 it will usually display as 0 if not supported.
727 Dump each input packet.
729 When dumping packets, also dump the payload.
731 Only use bit exact algorithms (for codec testing).
733 Set RTP payload size in bytes.
735 Read input at native frame rate. Mainly used to simulate a grab device.
737 Loop over the input stream. Currently it works only for image
738 streams. This option is used for automatic FFserver testing.
739 @item -loop_output @var{number_of_times}
740 Repeatedly loop output for formats that support looping such as animated GIF
741 (0 will loop the output infinitely).
742 @item -threads @var{count}
744 @item -vsync @var{parameter}
749 Each frame is passed with its timestamp from the demuxer to the muxer.
751 Frames will be duplicated and dropped to achieve exactly the requested
754 Frames are passed through with their timestamp or dropped so as to
755 prevent 2 frames from having the same timestamp.
757 Chooses between 1 and 2 depending on muxer capabilities. This is the
761 With -map you can select from which stream the timestamps should be
762 taken. You can leave either video or audio unchanged and sync the
763 remaining stream(s) to the unchanged one.
765 @item -async @var{samples_per_second}
766 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
767 the parameter is the maximum samples per second by which the audio is changed.
768 -async 1 is a special case where only the start of the audio stream is corrected
769 without any later correction.
771 Copy timestamps from input to output.
773 Copy input stream time base from input to output when stream copying.
775 Finish encoding when the shortest input stream ends.
776 @item -dts_delta_threshold
777 Timestamp discontinuity delta threshold.
778 @item -muxdelay @var{seconds}
779 Set the maximum demux-decode delay.
780 @item -muxpreload @var{seconds}
781 Set the initial demux-decode delay.
782 @item -streamid @var{output-stream-index}:@var{new-value}
783 Assign a new stream-id value to an output stream. This option should be
784 specified prior to the output filename to which it applies.
785 For the situation where multiple output files exist, a streamid
786 may be reassigned to a different value.
788 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
789 an output mpegts file:
791 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
795 @section Preset files
797 A preset file contains a sequence of @var{option}=@var{value} pairs,
798 one for each line, specifying a sequence of options which would be
799 awkward to specify on the command line. Lines starting with the hash
800 ('#') character are ignored and are used to provide comments. Check
801 the @file{ffpresets} directory in the FFmpeg source tree for examples.
803 Preset files are specified with the @code{vpre}, @code{apre},
804 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
805 filename of the preset instead of a preset name as input and can be
806 used for any kind of codec. For the @code{vpre}, @code{apre}, and
807 @code{spre} options, the options specified in a preset file are
808 applied to the currently selected codec of the same type as the preset
811 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
812 preset options identifies the preset file to use according to the
815 First ffmpeg searches for a file named @var{arg}.ffpreset in the
816 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
817 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
818 in that order. For example, if the argument is @code{libx264-max}, it will
819 search for the file @file{libx264-max.ffpreset}.
821 If no such file is found, then ffmpeg will search for a file named
822 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
823 directories, where @var{codec_name} is the name of the codec to which
824 the preset file options will be applied. For example, if you select
825 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
826 then it will search for the file @file{libx264-max.ffpreset}.
834 For streaming at very low bitrate application, use a low frame rate
835 and a small GOP size. This is especially true for RealVideo where
836 the Linux player does not seem to be very fast, so it can miss
837 frames. An example is:
840 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
844 The parameter 'q' which is displayed while encoding is the current
845 quantizer. The value 1 indicates that a very good quality could
846 be achieved. The value 31 indicates the worst quality. If q=31 appears
847 too often, it means that the encoder cannot compress enough to meet
848 your bitrate. You must either increase the bitrate, decrease the
849 frame rate or decrease the frame size.
852 If your computer is not fast enough, you can speed up the
853 compression at the expense of the compression ratio. You can use
854 '-me zero' to speed up motion estimation, and '-intra' to disable
855 motion estimation completely (you have only I-frames, which means it
856 is about as good as JPEG compression).
859 To have very low audio bitrates, reduce the sampling frequency
860 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
863 To have a constant quality (but a variable bitrate), use the option
864 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
868 When converting video files, you can use the '-sameq' option which
869 uses the same quality factor in the encoder as in the decoder.
870 It allows almost lossless encoding.
876 @c man begin EXAMPLES
878 @section Video and Audio grabbing
880 FFmpeg can grab video and audio from devices given that you specify the input
884 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
887 Note that you must activate the right video source and channel before
888 launching FFmpeg with any TV viewer such as xawtv
889 (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
890 have to set the audio recording levels correctly with a
893 @section X11 grabbing
895 FFmpeg can grab the X11 display.
898 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
901 0.0 is display.screen number of your X11 server, same as
902 the DISPLAY environment variable.
905 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
908 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
909 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
911 @section Video and Audio file format conversion
913 FFmpeg can use any supported file format and protocol as input:
918 You can use YUV files as input:
921 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
924 It will use the files:
926 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
927 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
930 The Y files use twice the resolution of the U and V files. They are
931 raw files, without header. They can be generated by all decent video
932 decoders. You must specify the size of the image with the @option{-s} option
933 if FFmpeg cannot guess it.
936 You can input from a raw YUV420P file:
939 ffmpeg -i /tmp/test.yuv /tmp/out.avi
942 test.yuv is a file containing raw YUV planar data. Each frame is composed
943 of the Y plane followed by the U and V planes at half vertical and
944 horizontal resolution.
947 You can output to a raw YUV420P file:
950 ffmpeg -i mydivx.avi hugefile.yuv
954 You can set several input files and output files:
957 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
960 Converts the audio file a.wav and the raw YUV video file a.yuv
964 You can also do audio and video conversions at the same time:
967 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
970 Converts a.wav to MPEG audio at 22050 Hz sample rate.
973 You can encode to several formats at the same time and define a
974 mapping from input stream to output streams:
977 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
980 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
981 file:index' specifies which input stream is used for each output
982 stream, in the order of the definition of output streams.
985 You can transcode decrypted VOBs:
988 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
991 This is a typical DVD ripping example; the input is a VOB file, the
992 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
993 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
994 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
995 input video. Furthermore, the audio stream is MP3-encoded so you need
996 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
997 The mapping is particularly useful for DVD transcoding
998 to get the desired audio language.
1000 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
1003 You can extract images from a video, or create a video from many images:
1005 For extracting images from a video:
1007 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1010 This will extract one video frame per second from the video and will
1011 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1012 etc. Images will be rescaled to fit the new WxH values.
1014 If you want to extract just a limited number of frames, you can use the
1015 above command in combination with the -vframes or -t option, or in
1016 combination with -ss to start extracting from a certain point in time.
1018 For creating a video from many images:
1020 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1023 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1024 composed of three digits padded with zeroes to express the sequence
1025 number. It is the same syntax supported by the C printf function, but
1026 only formats accepting a normal integer are suitable.
1029 You can put many streams of the same type in the output:
1032 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
1035 In addition to the first video and audio streams, the resulting
1036 output file @file{test12.avi} will contain the second video
1037 and the second audio stream found in the input streams list.
1039 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
1040 options have to be specified immediately after the name of the output
1041 file to which you want to add them.
1047 @include encoders.texi
1048 @include demuxers.texi
1049 @include muxers.texi
1050 @include indevs.texi
1051 @include outdevs.texi
1052 @include protocols.texi
1053 @include bitstream_filters.texi
1054 @include filters.texi
1055 @include metadata.texi
1060 @settitle FFmpeg video converter
1062 @c man begin SEEALSO
1063 ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
1066 @c man begin AUTHORS
1067 The FFmpeg developers