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 that can also grab from
26 a live audio/video source. It can also convert between arbitrary sample
27 rates and resize video on the fly with a high quality polyphase filter.
29 The command line interface is designed to be intuitive, in the sense
30 that ffmpeg tries to figure out all parameters that can possibly be
31 derived automatically. You usually only have to specify the target
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 avtools-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 -vframes @var{number}
163 Set the number of video frames to record.
165 Set frame rate (Hz value, fraction or abbreviation), (default = 25).
167 Set frame size. The format is @samp{wxh} (avserver default = 160x128, ffmpeg default = same as source).
168 The following abbreviations are recognized:
230 @item -aspect @var{aspect}
231 Set the video display aspect ratio specified by @var{aspect}.
233 @var{aspect} can be a floating point number string, or a string of the
234 form @var{num}:@var{den}, where @var{num} and @var{den} are the
235 numerator and denominator of the aspect ratio. For example "4:3",
236 "16:9", "1.3333", and "1.7777" are valid argument values.
238 @item -croptop @var{size}
239 @item -cropbottom @var{size}
240 @item -cropleft @var{size}
241 @item -cropright @var{size}
242 All the crop options have been removed. Use -vf
243 crop=width:height:x:y instead.
245 @item -padtop @var{size}
246 @item -padbottom @var{size}
247 @item -padleft @var{size}
248 @item -padright @var{size}
249 @item -padcolor @var{hex_color}
250 All the pad options have been removed. Use -vf
251 pad=width:height:x:y:color instead.
253 Disable video recording.
254 @item -bt @var{tolerance}
255 Set video bitrate tolerance (in bits, default 4000k).
256 Has a minimum value of: (target_bitrate/target_framerate).
257 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
258 willing to deviate from the target average bitrate value. This is
259 not related to min/max bitrate. Lowering tolerance too much has
260 an adverse effect on quality.
261 @item -maxrate @var{bitrate}
262 Set max video bitrate (in bit/s).
263 Requires -bufsize to be set.
264 @item -minrate @var{bitrate}
265 Set min video bitrate (in bit/s).
266 Most useful in setting up a CBR encode:
268 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
270 It is of little use elsewise.
271 @item -bufsize @var{size}
272 Set video buffer verifier buffer size (in bits).
273 @item -vcodec @var{codec}
274 Force video codec to @var{codec}. Use the @code{copy} special value to
275 tell that the raw codec data must be copied as is.
277 Use same quantizer as source (implies VBR).
280 Select the pass number (1 or 2). It is used to do two-pass
281 video encoding. The statistics of the video are recorded in the first
282 pass into a log file (see also the option -passlogfile),
283 and in the second pass that log file is used to generate the video
284 at the exact requested bitrate.
285 On pass 1, you may just deactivate audio and set output to null,
286 examples for Windows and Unix:
288 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
289 ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
292 @item -passlogfile @var{prefix}
293 Set two-pass log file name prefix to @var{prefix}, the default file name
294 prefix is ``ffmpeg2pass''. The complete file name will be
295 @file{PREFIX-N.log}, where N is a number specific to the output
299 Add a new video stream to the current output stream.
301 @item -vlang @var{code}
302 Set the ISO 639 language code (3 letters) of the current video stream.
304 @item -vf @var{filter_graph}
305 @var{filter_graph} is a description of the filter graph to apply to
307 Use the option "-filters" to show all the available filters (including
308 also sources and sinks).
312 @section Advanced Video Options
315 @item -pix_fmt @var{format}
316 Set pixel format. Use 'list' as parameter to show all the supported
318 @item -sws_flags @var{flags}
320 @item -g @var{gop_size}
321 Set the group of pictures size.
323 Use only intra frames.
326 @item -qscale @var{q}
327 Use fixed video quantizer scale (VBR).
329 minimum video quantizer scale (VBR)
331 maximum video quantizer scale (VBR)
333 maximum difference between the quantizer scales (VBR)
334 @item -qblur @var{blur}
335 video quantizer scale blur (VBR) (range 0.0 - 1.0)
336 @item -qcomp @var{compression}
337 video quantizer scale compression (VBR) (default 0.5).
338 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
340 @item -lmin @var{lambda}
341 minimum video lagrange factor (VBR)
342 @item -lmax @var{lambda}
343 max video lagrange factor (VBR)
344 @item -mblmin @var{lambda}
345 minimum macroblock quantizer scale (VBR)
346 @item -mblmax @var{lambda}
347 maximum macroblock quantizer scale (VBR)
349 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
350 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
352 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
355 @item -rc_init_cplx @var{complexity}
356 initial complexity for single pass encoding
357 @item -b_qfactor @var{factor}
358 qp factor between P- and B-frames
359 @item -i_qfactor @var{factor}
360 qp factor between P- and I-frames
361 @item -b_qoffset @var{offset}
362 qp offset between P- and B-frames
363 @item -i_qoffset @var{offset}
364 qp offset between P- and I-frames
365 @item -rc_eq @var{equation}
366 Set rate control equation (see section "Expression Evaluation")
367 (default = @code{tex^qComp}).
369 When computing the rate control equation expression, besides the
370 standard functions defined in the section "Expression Evaluation", the
371 following functions are available:
377 and the following constants are available:
399 @item -rc_override @var{override}
400 rate control override for specific intervals
401 @item -me_method @var{method}
402 Set motion estimation method to @var{method}.
403 Available methods are (from lowest to best quality):
406 Try just the (0, 0) vector.
415 exhaustive search (slow and marginally better than epzs)
418 @item -dct_algo @var{algo}
419 Set DCT algorithm to @var{algo}. Available values are:
422 FF_DCT_AUTO (default)
435 @item -idct_algo @var{algo}
436 Set IDCT algorithm to @var{algo}. Available values are:
439 FF_IDCT_AUTO (default)
463 Set error resilience to @var{n}.
466 FF_ER_CAREFUL (default)
475 @item -ec @var{bit_mask}
476 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
477 the following values:
480 FF_EC_GUESS_MVS (default = enabled)
482 FF_EC_DEBLOCK (default = enabled)
485 @item -bf @var{frames}
486 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
487 @item -mbd @var{mode}
491 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in ffmpeg).
493 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
495 FF_MB_DECISION_RD: rate distortion
499 Use four motion vector by macroblock (MPEG-4 only).
501 Use data partitioning (MPEG-4 only).
502 @item -bug @var{param}
503 Work around encoder bugs that are not auto-detected.
504 @item -strict @var{strictness}
505 How strictly to follow the standards.
507 Enable Advanced intra coding (h263+).
509 Enable Unlimited Motion Vector (h263+)
512 Deinterlace pictures.
514 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
515 Use this option if your input file is interlaced and you want
516 to keep the interlaced format for minimum losses.
517 The alternative is to deinterlace the input stream with
518 @option{-deinterlace}, but deinterlacing introduces losses.
520 Calculate PSNR of compressed frames.
522 Dump video coding statistics to @file{vstats_HHMMSS.log}.
523 @item -vstats_file @var{file}
524 Dump video coding statistics to @var{file}.
526 top=1/bottom=0/auto=-1 field first
527 @item -dc @var{precision}
529 @item -vtag @var{fourcc/tag}
530 Force video tag/fourcc.
533 @item -vbsf @var{bitstream_filter}
534 Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
536 ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
538 @item -force_key_frames @var{time}[,@var{time}...]
539 Force key frames at the specified timestamps, more precisely at the first
540 frames after each specified time.
541 This option can be useful to ensure that a seek point is present at a
542 chapter mark or any other designated place in the output file.
543 The timestamps must be specified in ascending order.
546 @section Audio Options
549 @item -aframes @var{number}
550 Set the number of audio frames to record.
552 Set the audio sampling frequency. For output streams it is set by
553 default to the frequency of the corresponding input stream. For input
554 streams this option only makes sense for audio grabbing devices and raw
555 demuxers and is mapped to the corresponding demuxer options.
557 Set the audio quality (codec-specific, VBR).
558 @item -ac @var{channels}
559 Set the number of audio channels. For output streams it is set by
560 default to the number of input audio channels. For input streams
561 this option only makes sense for audio grabbing devices and raw demuxers
562 and is mapped to the corresponding demuxer options.
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 AVserver testing.
730 This option is deprecated, use -loop.
731 @item -loop_output @var{number_of_times}
732 Repeatedly loop output for formats that support looping such as animated GIF
733 (0 will loop the output infinitely).
734 This option is deprecated, use -loop.
735 @item -threads @var{count}
737 @item -vsync @var{parameter}
742 Each frame is passed with its timestamp from the demuxer to the muxer.
744 Frames will be duplicated and dropped to achieve exactly the requested
747 Frames are passed through with their timestamp or dropped so as to
748 prevent 2 frames from having the same timestamp.
750 Chooses between 1 and 2 depending on muxer capabilities. This is the
754 With -map you can select from which stream the timestamps should be
755 taken. You can leave either video or audio unchanged and sync the
756 remaining stream(s) to the unchanged one.
758 @item -async @var{samples_per_second}
759 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
760 the parameter is the maximum samples per second by which the audio is changed.
761 -async 1 is a special case where only the start of the audio stream is corrected
762 without any later correction.
764 Copy timestamps from input to output.
766 Copy input stream time base from input to output when stream copying.
768 Finish encoding when the shortest input stream ends.
769 @item -dts_delta_threshold
770 Timestamp discontinuity delta threshold.
771 @item -muxdelay @var{seconds}
772 Set the maximum demux-decode delay.
773 @item -muxpreload @var{seconds}
774 Set the initial demux-decode delay.
775 @item -streamid @var{output-stream-index}:@var{new-value}
776 Assign a new stream-id value to an output stream. This option should be
777 specified prior to the output filename to which it applies.
778 For the situation where multiple output files exist, a streamid
779 may be reassigned to a different value.
781 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
782 an output mpegts file:
784 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
788 @section Preset files
790 A preset file contains a sequence of @var{option}=@var{value} pairs,
791 one for each line, specifying a sequence of options which would be
792 awkward to specify on the command line. Lines starting with the hash
793 ('#') character are ignored and are used to provide comments. Check
794 the @file{presets} directory in the Libav source tree for examples.
796 Preset files are specified with the @code{vpre}, @code{apre},
797 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
798 filename of the preset instead of a preset name as input and can be
799 used for any kind of codec. For the @code{vpre}, @code{apre}, and
800 @code{spre} options, the options specified in a preset file are
801 applied to the currently selected codec of the same type as the preset
804 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
805 preset options identifies the preset file to use according to the
808 First ffmpeg searches for a file named @var{arg}.ffpreset in the
809 directories @file{$AVCONV_DATADIR} (if set), and @file{$HOME/.avconv}, and in
810 the datadir defined at configuration time (usually @file{PREFIX/share/avconv})
811 in that order. For example, if the argument is @code{libx264-max}, it will
812 search for the file @file{libx264-max.ffpreset}.
814 If no such file is found, then ffmpeg will search for a file named
815 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
816 directories, where @var{codec_name} is the name of the codec to which
817 the preset file options will be applied. For example, if you select
818 the video codec with @code{-vcodec libx264} and use @code{-vpre max},
819 then it will search for the file @file{libx264-max.ffpreset}.
827 For streaming at very low bitrate application, use a low frame rate
828 and a small GOP size. This is especially true for RealVideo where
829 the Linux player does not seem to be very fast, so it can miss
830 frames. An example is:
833 ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
837 The parameter 'q' which is displayed while encoding is the current
838 quantizer. The value 1 indicates that a very good quality could
839 be achieved. The value 31 indicates the worst quality. If q=31 appears
840 too often, it means that the encoder cannot compress enough to meet
841 your bitrate. You must either increase the bitrate, decrease the
842 frame rate or decrease the frame size.
845 If your computer is not fast enough, you can speed up the
846 compression at the expense of the compression ratio. You can use
847 '-me zero' to speed up motion estimation, and '-intra' to disable
848 motion estimation completely (you have only I-frames, which means it
849 is about as good as JPEG compression).
852 To have very low audio bitrates, reduce the sampling frequency
853 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
856 To have a constant quality (but a variable bitrate), use the option
857 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
861 When converting video files, you can use the '-sameq' option which
862 uses the same quality factor in the encoder as in the decoder.
863 It allows almost lossless encoding.
869 @c man begin EXAMPLES
871 @section Video and Audio grabbing
873 If you specify the input format and device then ffmpeg can grab video
877 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
880 Note that you must activate the right video source and channel before
881 launching ffmpeg with any TV viewer such as
882 @uref{http://linux.bytesex.org/xawtv/, xawtv} by Gerd Knorr. You also
883 have to set the audio recording levels correctly with a
886 @section X11 grabbing
888 Grab the X11 display with ffmpeg via
891 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
894 0.0 is display.screen number of your X11 server, same as
895 the DISPLAY environment variable.
898 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
901 10 is the x-offset and 20 the y-offset for the grabbing.
904 ffmpeg -f x11grab -follow_mouse centered -s cif -r 25 -i :0.0 /tmp/out.mpg
907 The grabbing region follows the mouse pointer, which stays at the center of
911 ffmpeg -f x11grab -follow_mouse 100 -s cif -r 25 -i :0.0 /tmp/out.mpg
914 Only follows when mouse pointer reaches within 100 pixels to the edge of
918 ffmpeg -f x11grab -show_region 1 -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
921 The grabbing region will be indicated on screen.
924 ffmpeg -f x11grab -follow_mouse centered -show_region 1 -s cif -r 25 -i :0.0 /tmp/out.mpg
927 The grabbing region indication will follow the mouse pointer.
930 @section Video and Audio file format conversion
932 Any supported file format and protocol can serve as input to ffmpeg:
937 You can use YUV files as input:
940 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
943 It will use the files:
945 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
946 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
949 The Y files use twice the resolution of the U and V files. They are
950 raw files, without header. They can be generated by all decent video
951 decoders. You must specify the size of the image with the @option{-s} option
952 if ffmpeg cannot guess it.
955 You can input from a raw YUV420P file:
958 ffmpeg -i /tmp/test.yuv /tmp/out.avi
961 test.yuv is a file containing raw YUV planar data. Each frame is composed
962 of the Y plane followed by the U and V planes at half vertical and
963 horizontal resolution.
966 You can output to a raw YUV420P file:
969 ffmpeg -i mydivx.avi hugefile.yuv
973 You can set several input files and output files:
976 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
979 Converts the audio file a.wav and the raw YUV video file a.yuv
983 You can also do audio and video conversions at the same time:
986 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
989 Converts a.wav to MPEG audio at 22050 Hz sample rate.
992 You can encode to several formats at the same time and define a
993 mapping from input stream to output streams:
996 ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
999 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
1000 file:index' specifies which input stream is used for each output
1001 stream, in the order of the definition of output streams.
1004 You can transcode decrypted VOBs:
1007 ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
1010 This is a typical DVD ripping example; the input is a VOB file, the
1011 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
1012 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
1013 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
1014 input video. Furthermore, the audio stream is MP3-encoded so you need
1015 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
1016 The mapping is particularly useful for DVD transcoding
1017 to get the desired audio language.
1019 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
1022 You can extract images from a video, or create a video from many images:
1024 For extracting images from a video:
1026 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1029 This will extract one video frame per second from the video and will
1030 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1031 etc. Images will be rescaled to fit the new WxH values.
1033 If you want to extract just a limited number of frames, you can use the
1034 above command in combination with the -vframes or -t option, or in
1035 combination with -ss to start extracting from a certain point in time.
1037 For creating a video from many images:
1039 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1042 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1043 composed of three digits padded with zeroes to express the sequence
1044 number. It is the same syntax supported by the C printf function, but
1045 only formats accepting a normal integer are suitable.
1048 You can put many streams of the same type in the output:
1051 ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
1054 In addition to the first video and audio streams, the resulting
1055 output file @file{test12.avi} will contain the second video
1056 and the second audio stream found in the input streams list.
1058 The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
1059 options have to be specified immediately after the name of the output
1060 file to which you want to add them.
1066 @include encoders.texi
1067 @include demuxers.texi
1068 @include muxers.texi
1069 @include indevs.texi
1070 @include outdevs.texi
1071 @include protocols.texi
1072 @include bitstream_filters.texi
1073 @include filters.texi
1074 @include metadata.texi
1079 @settitle ffmpeg video converter
1081 @c man begin SEEALSO
1082 avplay(1), avprobe(1), avserver(1) and the Libav HTML documentation
1085 @c man begin AUTHORS
1086 The Libav developers