1 \input texinfo @c -*- texinfo -*-
3 @settitle avconv Documentation
5 @center @titlefont{avconv Documentation}
14 The generic syntax is:
18 avconv [global options] [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
23 @c man begin DESCRIPTION
25 avconv 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 avconv 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.
38 Exceptions from this rule are the global options (e.g. vebosity level),
39 which should be specified first.
43 To set the video bitrate of the output file to 64kbit/s:
45 avconv -i input.avi -b 64k output.avi
49 To force the frame rate of the output file to 24 fps:
51 avconv -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 avconv -r 1 -i input.m2v -r 24 output.avi
62 The format option may be needed for raw input files.
64 By default avconv 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
70 @chapter Stream selection
71 @c man begin STREAM SELECTION
73 By default avconv tries to pick the "best" stream of each type present in input
74 files and add them to each output file. For video, this means the highest
75 resolution, for audio the highest channel count. For subtitle it's simply the
76 first subtitle stream.
78 You can disable some of those defaults by using @code{-vn/-an/-sn} options. For
79 full manual control, use the @code{-map} option, which disables the defaults just
82 @c man end STREAM SELECTION
87 @include avtools-common-opts.texi
96 @item -i @var{filename}
100 Overwrite output files.
102 @item -c[:@var{stream_type}][:@var{stream_index}] @var{codec}
103 @item -codec[:@var{stream_type}][:@var{stream_index}] @var{codec}
104 Select an encoder (when used before an output file) or a decoder (when used
105 before an input file) for one or more streams. @var{codec} is the name of a
106 decoder/encoder or a special value @code{copy} (output only) to indicate that
107 the stream is not to be reencoded.
109 @var{stream_type} may be 'v' for video, 'a' for audio, 's' for subtitle and 'd'
110 for data streams. @var{stream_index} is a global zero-based stream index if
111 @var{stream_type} isn't given, otherwise it counts only streams of the given
112 type. If @var{stream_index} is omitted, this option applies to all streams of
113 the given type or all streams of any type if @var{stream_type} is missing as
114 well (note that this only makes sense when all streams are of the same type or
115 @var{codec} is @code{copy}).
119 avconv -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
121 encodes all video streams with libx264 and copies all audio streams.
123 For each stream, the last matching @code{c} option is applied, so
125 avconv -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
127 will copy all the streams except the second video, which will be encoded with
128 libx264, and the 138th audio, which will be encoded with libvorbis.
130 @item -t @var{duration}
131 Restrict the transcoded/captured video sequence
132 to the duration specified in seconds.
133 @code{hh:mm:ss[.xxx]} syntax is also supported.
135 @item -fs @var{limit_size}
136 Set the file size limit.
138 @item -ss @var{position}
139 When used as an input option (before @code{-i}), seeks in this input file to
140 @var{position}. When used as an output option (before an output filename),
141 decodes but discards input until the timestamps reach @var{position}. This is
142 slower, but more accurate.
144 @var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
146 @item -itsoffset @var{offset}
147 Set the input time offset in seconds.
148 @code{[-]hh:mm:ss[.xxx]} syntax is also supported.
149 The offset is added to the timestamps of the input files.
150 Specifying a positive offset means that the corresponding
151 streams are delayed by 'offset' seconds.
153 @item -metadata[:metadata_specifier] @var{key}=@var{value}
154 Set a metadata key/value pair.
156 An optional @var{metadata_specifier} may be given to set metadata
157 on streams or chapters. See @code{-map_metadata} documentation for
160 This option overrides metadata set with @code{-map_metadata}. It is
161 also possible to delete metadata by using an empty value.
163 For example, for setting the title in the output file:
165 avconv -i in.avi -metadata title="my title" out.flv
168 To set the language of the second stream:
170 avconv -i INPUT -metadata:s:1 language=eng OUTPUT
173 @item -v @var{number}
174 Set the logging verbosity level.
176 @item -target @var{type}
177 Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
178 "ntsc-svcd", ... ). All the format options (bitrate, codecs,
179 buffer sizes) are then set automatically. You can just type:
182 avconv -i myfile.avi -target vcd /tmp/vcd.mpg
185 Nevertheless you can specify additional options as long as you know
186 they do not conflict with the standard, as in:
189 avconv -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
192 @item -dframes @var{number}
193 Set the number of data frames to record. This is an alias for @code{-frames:d}.
195 @item -frames[:stream_specifier] @var{framecount}
196 Stop writing to the stream after @var{framecount} frames.
199 @item -qscale @var{q}
200 Use fixed quality scale (VBR). The meaning of @var{q} is
203 @item -filter[:stream_specifier] @var{filter_graph}
204 @var{filter_graph} is a description of the filter graph to apply to
205 the stream. Use @code{-filters} to show all the available filters
206 (including also sources and sinks).
210 @section Video Options
213 @item -vframes @var{number}
214 Set the number of video frames to record. This is an alias for @code{-frames:v}.
216 Set frame rate (Hz value, fraction or abbreviation), (default = 25).
218 Set frame size. The format is @samp{wxh} (avserver default = 160x128, avconv default = same as source).
219 The following abbreviations are recognized:
281 @item -aspect @var{aspect}
282 Set the video display aspect ratio specified by @var{aspect}.
284 @var{aspect} can be a floating point number string, or a string of the
285 form @var{num}:@var{den}, where @var{num} and @var{den} are the
286 numerator and denominator of the aspect ratio. For example "4:3",
287 "16:9", "1.3333", and "1.7777" are valid argument values.
290 Disable video recording.
291 @item -bt @var{tolerance}
292 Set video bitrate tolerance (in bits, default 4000k).
293 Has a minimum value of: (target_bitrate/target_framerate).
294 In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
295 willing to deviate from the target average bitrate value. This is
296 not related to min/max bitrate. Lowering tolerance too much has
297 an adverse effect on quality.
298 @item -maxrate @var{bitrate}
299 Set max video bitrate (in bit/s).
300 Requires -bufsize to be set.
301 @item -minrate @var{bitrate}
302 Set min video bitrate (in bit/s).
303 Most useful in setting up a CBR encode:
305 avconv -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
307 It is of little use elsewise.
308 @item -bufsize @var{size}
309 Set video buffer verifier buffer size (in bits).
310 @item -vcodec @var{codec}
311 Set the video codec. This is an alias for @code{-codec:v}.
313 Use same quantizer as source (implies VBR).
315 Note that this is NOT SAME QUALITY. Do not use this option unless you know you
319 Select the pass number (1 or 2). It is used to do two-pass
320 video encoding. The statistics of the video are recorded in the first
321 pass into a log file (see also the option -passlogfile),
322 and in the second pass that log file is used to generate the video
323 at the exact requested bitrate.
324 On pass 1, you may just deactivate audio and set output to null,
325 examples for Windows and Unix:
327 avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
328 avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
331 @item -passlogfile @var{prefix}
332 Set two-pass log file name prefix to @var{prefix}, the default file name
333 prefix is ``av2pass''. The complete file name will be
334 @file{PREFIX-N.log}, where N is a number specific to the output
337 @item -vf @var{filter_graph}
338 @var{filter_graph} is a description of the filter graph to apply to
340 Use the option "-filters" to show all the available filters (including
341 also sources and sinks). This is an alias for @code{-filter:v}.
345 @section Advanced Video Options
348 @item -pix_fmt @var{format}
349 Set pixel format. Use @code{-pix_fmts} to show all the supported
351 @item -sws_flags @var{flags}
353 @item -g @var{gop_size}
354 Set the group of pictures size.
358 minimum video quantizer scale (VBR)
360 maximum video quantizer scale (VBR)
362 maximum difference between the quantizer scales (VBR)
363 @item -qblur @var{blur}
364 video quantizer scale blur (VBR) (range 0.0 - 1.0)
365 @item -qcomp @var{compression}
366 video quantizer scale compression (VBR) (default 0.5).
367 Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
369 @item -lmin @var{lambda}
370 minimum video lagrange factor (VBR)
371 @item -lmax @var{lambda}
372 max video lagrange factor (VBR)
373 @item -mblmin @var{lambda}
374 minimum macroblock quantizer scale (VBR)
375 @item -mblmax @var{lambda}
376 maximum macroblock quantizer scale (VBR)
378 These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
379 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
381 avconv -i src.ext -lmax 21*QP2LAMBDA dst.ext
384 @item -rc_init_cplx @var{complexity}
385 initial complexity for single pass encoding
386 @item -b_qfactor @var{factor}
387 qp factor between P- and B-frames
388 @item -i_qfactor @var{factor}
389 qp factor between P- and I-frames
390 @item -b_qoffset @var{offset}
391 qp offset between P- and B-frames
392 @item -i_qoffset @var{offset}
393 qp offset between P- and I-frames
394 @item -rc_eq @var{equation}
395 Set rate control equation (see section "Expression Evaluation")
396 (default = @code{tex^qComp}).
398 When computing the rate control equation expression, besides the
399 standard functions defined in the section "Expression Evaluation", the
400 following functions are available:
406 and the following constants are available:
428 @item -rc_override @var{override}
429 rate control override for specific intervals
430 @item -me_method @var{method}
431 Set motion estimation method to @var{method}.
432 Available methods are (from lowest to best quality):
435 Try just the (0, 0) vector.
444 exhaustive search (slow and marginally better than epzs)
448 Set error resilience to @var{n}.
451 FF_ER_CAREFUL (default)
457 FF_ER_VERY_AGGRESSIVE
460 @item -ec @var{bit_mask}
461 Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
462 the following values:
465 FF_EC_GUESS_MVS (default = enabled)
467 FF_EC_DEBLOCK (default = enabled)
470 @item -bf @var{frames}
471 Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
472 @item -mbd @var{mode}
476 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in avconv).
478 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
480 FF_MB_DECISION_RD: rate distortion
483 @item -bug @var{param}
484 Work around encoder bugs that are not auto-detected.
485 @item -strict @var{strictness}
486 How strictly to follow the standards.
489 Deinterlace pictures.
491 Dump video coding statistics to @file{vstats_HHMMSS.log}.
492 @item -vstats_file @var{file}
493 Dump video coding statistics to @var{file}.
495 top=1/bottom=0/auto=-1 field first
496 @item -dc @var{precision}
498 @item -vtag @var{fourcc/tag}
499 Force video tag/fourcc. This is an alias for @code{-tag:v}.
502 @item -force_key_frames @var{time}[,@var{time}...]
503 Force key frames at the specified timestamps, more precisely at the first
504 frames after each specified time.
505 This option can be useful to ensure that a seek point is present at a
506 chapter mark or any other designated place in the output file.
507 The timestamps must be specified in ascending order.
510 @section Audio Options
513 @item -aframes @var{number}
514 Set the number of audio frames to record. This is an alias for @code{-frames:a}.
516 Set the audio sampling frequency. For output streams it is set by
517 default to the frequency of the corresponding input stream. For input
518 streams this option only makes sense for audio grabbing devices and raw
519 demuxers and is mapped to the corresponding demuxer options.
521 Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
522 @item -ac @var{channels}
523 Set the number of audio channels. For output streams it is set by
524 default to the number of input audio channels. For input streams
525 this option only makes sense for audio grabbing devices and raw demuxers
526 and is mapped to the corresponding demuxer options.
528 Disable audio recording.
529 @item -acodec @var{codec}
530 Set the audio codec. This is an alias for @code{-codec:a}.
531 @item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt}
532 Set the audio sample format. Use @code{-help sample_fmts} to get a list
533 of supported sample formats.
536 @section Advanced Audio options:
539 @item -atag @var{fourcc/tag}
540 Force audio tag/fourcc. This is an alias for @code{-tag:a}.
541 @item -audio_service_type @var{type}
542 Set the type of service that the audio stream contains.
545 Main Audio Service (default)
565 @section Subtitle options:
568 @item -scodec @var{codec}
569 Set the subtitle codec. This is an alias for @code{-codec:s}.
571 Disable subtitle recording.
574 @section Audio/Video grab options
578 Synchronize read on input.
581 @section Advanced options
584 @item -map [-]@var{input_file_id}[:@var{input_stream_type}][:@var{input_stream_id}][,@var{sync_file_id}[:@var{sync_stream_type}][:@var{sync_stream_id}]]
586 Designate one or more input streams as a source for the output file. Each input
587 stream is identified by the input file index @var{input_file_id} and
588 the input stream index @var{input_stream_id} within the input
589 file. Both indices start at 0. If specified,
590 @var{sync_file_id}:@var{sync_stream_id} sets which input stream
591 is used as a presentation sync reference.
593 If @var{input_stream_type} is specified -- 'v' for video, 'a' for audio, 's' for
594 subtitle and 'd' for data -- then @var{input_stream_id} counts only the streams
595 of this type. Same for @var{sync_stream_type}.
597 @var{input_stream_id} may be omitted, in which case all streams of the given
598 type are mapped (or all streams in the file, if no type is specified).
600 The first @code{-map} option on the command line specifies the
601 source for output stream 0, the second @code{-map} option specifies
602 the source for output stream 1, etc.
604 A @code{-} character before the stream identifier creates a "negative" mapping.
605 It disables matching streams from already created mappings.
607 For example, to map ALL streams from the first input file to output
609 avconv -i INPUT -map 0 output
612 For example, if you have two audio streams in the first input file,
613 these streams are identified by "0:0" and "0:1". You can use
614 @code{-map} to select which streams to place in an output file. For
617 avconv -i INPUT -map 0:1 out.wav
619 will map the input stream in @file{INPUT} identified by "0:1" to
620 the (single) output stream in @file{out.wav}.
622 For example, to select the stream with index 2 from input file
623 @file{a.mov} (specified by the identifier "0:2"), and stream with
624 index 6 from input @file{b.mov} (specified by the identifier "1:6"),
625 and copy them to the output file @file{out.mov}:
627 avconv -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
630 To select all video and the third audio stream from an input file:
632 avconv -i INPUT -map 0:v -map 0:a:2 OUTPUT
635 To map all the streams except the second audio, use negative mappings
637 avconv -i INPUT -map 0 -map -0:a:1 OUTPUT
640 Note that using this option disables the default mappings for this output file.
642 @item -map_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}]
643 Set metadata information of the next output file from @var{infile}. Note that
644 those are file indices (zero-based), not filenames.
645 Optional @var{metadata_type} parameters specify, which metadata to copy - (g)lobal
646 (i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
647 per-(p)rogram. All metadata specifiers other than global must be followed by the
648 stream/chapter/program index. If metadata specifier is omitted, it defaults to
651 By default, global metadata is copied from the first input file,
652 per-stream and per-chapter metadata is copied along with streams/chapters. These
653 default mappings are disabled by creating any mapping of the relevant type. A negative
654 file index can be used to create a dummy mapping that just disables automatic copying.
656 For example to copy metadata from the first stream of the input file to global metadata
659 avconv -i in.ogg -map_metadata 0:s:0 out.mp3
661 @item -map_chapters @var{input_file_index}
662 Copy chapters from input file with index @var{input_file_index} to the next
663 output file. If no chapter mapping is specified, then chapters are copied from
664 the first input file with at least one chapter. Use a negative file index to
665 disable any chapter copying.
667 Print specific debug info.
669 Show benchmarking information at the end of an encode.
670 Shows CPU time used and maximum memory consumption.
671 Maximum memory consumption is not supported on all systems,
672 it will usually display as 0 if not supported.
674 Dump each input packet.
676 When dumping packets, also dump the payload.
678 Only use bit exact algorithms (for codec testing).
680 Set RTP payload size in bytes.
682 Read input at native frame rate. Mainly used to simulate a grab device.
683 @item -threads @var{count}
685 @item -vsync @var{parameter}
690 Each frame is passed with its timestamp from the demuxer to the muxer.
692 Frames will be duplicated and dropped to achieve exactly the requested
695 Frames are passed through with their timestamp or dropped so as to
696 prevent 2 frames from having the same timestamp.
698 Chooses between 1 and 2 depending on muxer capabilities. This is the
702 With -map you can select from which stream the timestamps should be
703 taken. You can leave either video or audio unchanged and sync the
704 remaining stream(s) to the unchanged one.
706 @item -async @var{samples_per_second}
707 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
708 the parameter is the maximum samples per second by which the audio is changed.
709 -async 1 is a special case where only the start of the audio stream is corrected
710 without any later correction.
712 Copy timestamps from input to output.
714 Copy input stream time base from input to output when stream copying.
716 Finish encoding when the shortest input stream ends.
717 @item -dts_delta_threshold
718 Timestamp discontinuity delta threshold.
719 @item -muxdelay @var{seconds}
720 Set the maximum demux-decode delay.
721 @item -muxpreload @var{seconds}
722 Set the initial demux-decode delay.
723 @item -streamid @var{output-stream-index}:@var{new-value}
724 Assign a new stream-id value to an output stream. This option should be
725 specified prior to the output filename to which it applies.
726 For the situation where multiple output files exist, a streamid
727 may be reassigned to a different value.
729 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
730 an output mpegts file:
732 avconv -i infile -streamid 0:33 -streamid 1:36 out.ts
735 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters}
736 Set bitstream filters for matching streams. @var{bistream_filters} is
737 a comma-separated list of bitstream filters. Use the @code{-bsfs} option
738 to get the list of bitstream filters.
740 avconv -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
743 avconv -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
746 @item -tag[:@var{stream_specifier}] @var{codec_tag}
747 Force a tag/fourcc for matching streams.
756 For streaming at very low bitrate application, use a low frame rate
757 and a small GOP size. This is especially true for RealVideo where
758 the Linux player does not seem to be very fast, so it can miss
759 frames. An example is:
762 avconv -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
766 The parameter 'q' which is displayed while encoding is the current
767 quantizer. The value 1 indicates that a very good quality could
768 be achieved. The value 31 indicates the worst quality. If q=31 appears
769 too often, it means that the encoder cannot compress enough to meet
770 your bitrate. You must either increase the bitrate, decrease the
771 frame rate or decrease the frame size.
774 If your computer is not fast enough, you can speed up the
775 compression at the expense of the compression ratio. You can use
776 '-me zero' to speed up motion estimation, and '-intra' to disable
777 motion estimation completely (you have only I-frames, which means it
778 is about as good as JPEG compression).
781 To have very low audio bitrates, reduce the sampling frequency
782 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
785 To have a constant quality (but a variable bitrate), use the option
786 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
793 @c man begin EXAMPLES
795 @section Video and Audio grabbing
797 If you specify the input format and device then avconv can grab video
801 avconv -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
804 Note that you must activate the right video source and channel before
805 launching avconv with any TV viewer such as
806 @uref{http://linux.bytesex.org/xawtv/, xawtv} by Gerd Knorr. You also
807 have to set the audio recording levels correctly with a
810 @section X11 grabbing
812 Grab the X11 display with avconv via
815 avconv -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
818 0.0 is display.screen number of your X11 server, same as
819 the DISPLAY environment variable.
822 avconv -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
825 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
826 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
828 @section Video and Audio file format conversion
830 Any supported file format and protocol can serve as input to avconv:
835 You can use YUV files as input:
838 avconv -i /tmp/test%d.Y /tmp/out.mpg
841 It will use the files:
843 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
844 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
847 The Y files use twice the resolution of the U and V files. They are
848 raw files, without header. They can be generated by all decent video
849 decoders. You must specify the size of the image with the @option{-s} option
850 if avconv cannot guess it.
853 You can input from a raw YUV420P file:
856 avconv -i /tmp/test.yuv /tmp/out.avi
859 test.yuv is a file containing raw YUV planar data. Each frame is composed
860 of the Y plane followed by the U and V planes at half vertical and
861 horizontal resolution.
864 You can output to a raw YUV420P file:
867 avconv -i mydivx.avi hugefile.yuv
871 You can set several input files and output files:
874 avconv -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
877 Converts the audio file a.wav and the raw YUV video file a.yuv
881 You can also do audio and video conversions at the same time:
884 avconv -i /tmp/a.wav -ar 22050 /tmp/a.mp2
887 Converts a.wav to MPEG audio at 22050 Hz sample rate.
890 You can encode to several formats at the same time and define a
891 mapping from input stream to output streams:
894 avconv -i /tmp/a.wav -map 0:a -b 64k /tmp/a.mp2 -map 0:a -b 128k /tmp/b.mp2
897 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
898 file:index' specifies which input stream is used for each output
899 stream, in the order of the definition of output streams.
902 You can transcode decrypted VOBs:
905 avconv -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
908 This is a typical DVD ripping example; the input is a VOB file, the
909 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
910 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
911 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
912 input video. Furthermore, the audio stream is MP3-encoded so you need
913 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
914 The mapping is particularly useful for DVD transcoding
915 to get the desired audio language.
917 NOTE: To see the supported input formats, use @code{avconv -formats}.
920 You can extract images from a video, or create a video from many images:
922 For extracting images from a video:
924 avconv -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
927 This will extract one video frame per second from the video and will
928 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
929 etc. Images will be rescaled to fit the new WxH values.
931 If you want to extract just a limited number of frames, you can use the
932 above command in combination with the -vframes or -t option, or in
933 combination with -ss to start extracting from a certain point in time.
935 For creating a video from many images:
937 avconv -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
940 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
941 composed of three digits padded with zeroes to express the sequence
942 number. It is the same syntax supported by the C printf function, but
943 only formats accepting a normal integer are suitable.
946 You can put many streams of the same type in the output:
949 avconv -i test1.avi -i test2.avi -map 0.3 -map 0.2 -map 0.1 -map 0.0 -c copy test12.nut
952 The resulting output file @file{test12.avi} will contain first four streams from
953 the input file in reverse order.
959 @include encoders.texi
960 @include demuxers.texi
963 @include outdevs.texi
964 @include protocols.texi
965 @include bitstream_filters.texi
966 @include filters.texi
967 @include metadata.texi
972 @settitle avconv video converter
975 avplay(1), avprobe(1), avserver(1) and the Libav HTML documentation