1 \input texinfo @c -*- texinfo -*-
3 @settitle ffmpeg Documentation
5 @center @titlefont{ffmpeg Documentation}
14 ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_file}@} ... @{[@var{output_file_options}] @file{output_file}@} ...
17 @c man begin DESCRIPTION
19 @command{ffmpeg} is a very fast video and audio converter that can also grab from
20 a live audio/video source. It can also convert between arbitrary sample
21 rates and resize video on the fly with a high quality polyphase filter.
23 @command{ffmpeg} reads from an arbitrary number of input "files" (which can be regular
24 files, pipes, network streams, grabbing devices, etc.), specified by the
25 @code{-i} option, and writes to an arbitrary number of output "files", which are
26 specified by a plain output filename. Anything found on the command line which
27 cannot be interpreted as an option is considered to be an output filename.
29 Each input or output file can, in principle, contain any number of streams of
30 different types (video/audio/subtitle/attachment/data). The allowed number and/or
31 types of streams may be limited by the container format. Selecting which
32 streams from which inputs will go into which output is either done automatically
33 or with the @code{-map} option (see the Stream selection chapter).
35 To refer to input files in options, you must use their indices (0-based). E.g.
36 the first input file is @code{0}, the second is @code{1}, etc. Similarly, streams
37 within a file are referred to by their indices. E.g. @code{2:3} refers to the
38 fourth stream in the third input file. Also see the Stream specifiers chapter.
40 As a general rule, options are applied to the next specified
41 file. Therefore, order is important, and you can have the same
42 option on the command line multiple times. Each occurrence is
43 then applied to the next input or output file.
44 Exceptions from this rule are the global options (e.g. verbosity level),
45 which should be specified first.
47 Do not mix input and output files -- first specify all input files, then all
48 output files. Also do not mix options which belong to different files. All
49 options apply ONLY to the next input or output file and are reset between files.
53 To set the video bitrate of the output file to 64 kbit/s:
55 ffmpeg -i input.avi -b:v 64k -bufsize 64k output.avi
59 To force the frame rate of the output file to 24 fps:
61 ffmpeg -i input.avi -r 24 output.avi
65 To force the frame rate of the input file (valid for raw formats only)
66 to 1 fps and the frame rate of the output file to 24 fps:
68 ffmpeg -r 1 -i input.m2v -r 24 output.avi
72 The format option may be needed for raw input files.
74 @c man end DESCRIPTION
76 @chapter Detailed description
77 @c man begin DETAILED DESCRIPTION
79 The transcoding process in @command{ffmpeg} for each output can be described by
80 the following diagram:
83 _______ ______________
85 | input | demuxer | encoded data | decoder
86 | file | ---------> | packets | -----+
87 |_______| |______________| |
94 ________ ______________ |
96 | output | <-------- | encoded data | <----+
97 | file | muxer | packets | encoder
98 |________| |______________|
103 @command{ffmpeg} calls the libavformat library (containing demuxers) to read
104 input files and get packets containing encoded data from them. When there are
105 multiple input files, @command{ffmpeg} tries to keep them synchronized by
106 tracking lowest timestamp on any active input stream.
108 Encoded packets are then passed to the decoder (unless streamcopy is selected
109 for the stream, see further for a description). The decoder produces
110 uncompressed frames (raw video/PCM audio/...) which can be processed further by
111 filtering (see next section). After filtering, the frames are passed to the
112 encoder, which encodes them and outputs encoded packets. Finally those are
113 passed to the muxer, which writes the encoded packets to the output file.
116 Before encoding, @command{ffmpeg} can process raw audio and video frames using
117 filters from the libavfilter library. Several chained filters form a filter
118 graph. @command{ffmpeg} distinguishes between two types of filtergraphs:
121 @subsection Simple filtergraphs
122 Simple filtergraphs are those that have exactly one input and output, both of
123 the same type. In the above diagram they can be represented by simply inserting
124 an additional step between decoding and encoding:
127 _________ __________ ______________
129 | decoded | fltrgrph | filtered | encoder | encoded data |
130 | frames | ----------> | frames | ---------> | packets |
131 |_________| |__________| |______________|
135 Simple filtergraphs are configured with the per-stream @option{-filter} option
136 (with @option{-vf} and @option{-af} aliases for video and audio respectively).
137 A simple filtergraph for video can look for example like this:
140 _______ _____________ _______ ________
142 | input | ---> | deinterlace | ---> | scale | ---> | output |
143 |_______| |_____________| |_______| |________|
147 Note that some filters change frame properties but not frame contents. E.g. the
148 @code{fps} filter in the example above changes number of frames, but does not
149 touch the frame contents. Another example is the @code{setpts} filter, which
150 only sets timestamps and otherwise passes the frames unchanged.
152 @subsection Complex filtergraphs
153 Complex filtergraphs are those which cannot be described as simply a linear
154 processing chain applied to one stream. This is the case, for example, when the graph has
155 more than one input and/or output, or when output stream type is different from
156 input. They can be represented with the following diagram:
161 | input 0 |\ __________
163 \ _________ /| output 0 |
165 _________ \| complex | /
167 | input 1 |---->| filter |\
168 |_________| | | \ __________
171 _________ / |_________| |__________|
178 Complex filtergraphs are configured with the @option{-filter_complex} option.
179 Note that this option is global, since a complex filtergraph, by its nature,
180 cannot be unambiguously associated with a single stream or file.
182 The @option{-lavfi} option is equivalent to @option{-filter_complex}.
184 A trivial example of a complex filtergraph is the @code{overlay} filter, which
185 has two video inputs and one video output, containing one video overlaid on top
186 of the other. Its audio counterpart is the @code{amix} filter.
189 Stream copy is a mode selected by supplying the @code{copy} parameter to the
190 @option{-codec} option. It makes @command{ffmpeg} omit the decoding and encoding
191 step for the specified stream, so it does only demuxing and muxing. It is useful
192 for changing the container format or modifying container-level metadata. The
193 diagram above will, in this case, simplify to this:
196 _______ ______________ ________
198 | input | demuxer | encoded data | muxer | output |
199 | file | ---------> | packets | -------> | file |
200 |_______| |______________| |________|
204 Since there is no decoding or encoding, it is very fast and there is no quality
205 loss. However, it might not work in some cases because of many factors. Applying
206 filters is obviously also impossible, since filters work on uncompressed data.
208 @c man end DETAILED DESCRIPTION
210 @chapter Stream selection
211 @c man begin STREAM SELECTION
213 By default, @command{ffmpeg} includes only one stream of each type (video, audio, subtitle)
214 present in the input files and adds them to each output file. It picks the
215 "best" of each based upon the following criteria: for video, it is the stream
216 with the highest resolution, for audio, it is the stream with the most channels, for
217 subtitles, it is the first subtitle stream. In the case where several streams of
218 the same type rate equally, the stream with the lowest index is chosen.
220 You can disable some of those defaults by using the @code{-vn/-an/-sn} options. For
221 full manual control, use the @code{-map} option, which disables the defaults just
224 @c man end STREAM SELECTION
229 @include fftools-common-opts.texi
231 @section Main options
235 @item -f @var{fmt} (@emph{input/output})
236 Force input or output file format. The format is normally auto detected for input
237 files and guessed from the file extension for output files, so this option is not
238 needed in most cases.
240 @item -i @var{filename} (@emph{input})
243 @item -y (@emph{global})
244 Overwrite output files without asking.
246 @item -n (@emph{global})
247 Do not overwrite output files, and exit immediately if a specified
248 output file already exists.
250 @item -c[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
251 @itemx -codec[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
252 Select an encoder (when used before an output file) or a decoder (when used
253 before an input file) for one or more streams. @var{codec} is the name of a
254 decoder/encoder or a special value @code{copy} (output only) to indicate that
255 the stream is not to be re-encoded.
259 ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
261 encodes all video streams with libx264 and copies all audio streams.
263 For each stream, the last matching @code{c} option is applied, so
265 ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
267 will copy all the streams except the second video, which will be encoded with
268 libx264, and the 138th audio, which will be encoded with libvorbis.
270 @item -t @var{duration} (@emph{output})
271 Stop writing the output after its duration reaches @var{duration}.
272 @var{duration} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.
274 -to and -t are mutually exclusive and -t has priority.
276 @item -to @var{position} (@emph{output})
277 Stop writing the output at @var{position}.
278 @var{position} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.
280 -to and -t are mutually exclusive and -t has priority.
282 @item -fs @var{limit_size} (@emph{output})
283 Set the file size limit, expressed in bytes.
285 @item -ss @var{position} (@emph{input/output})
286 When used as an input option (before @code{-i}), seeks in this input file to
287 @var{position}. Note the in most formats it is not possible to seek exactly, so
288 @command{ffmpeg} will seek to the closest seek point before @var{position}.
289 When transcoding and @option{-accurate_seek} is enabled (the default), this
290 extra segment between the seek point and @var{position} will be decoded and
291 discarded. When doing stream copy or when @option{-noaccurate_seek} is used, it
294 When used as an output option (before an output filename), decodes but discards
295 input until the timestamps reach @var{position}.
297 @var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
299 @item -itsoffset @var{offset} (@emph{input})
300 Set the input time offset.
302 @var{offset} must be a time duration specification,
303 see @ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}.
305 The offset is added to the timestamps of the input files. Specifying
306 a positive offset means that the corresponding streams are delayed by
307 the time duration specified in @var{offset}.
309 @item -timestamp @var{date} (@emph{output})
310 Set the recording timestamp in the container.
312 @var{date} must be a time duration specification,
313 see @ref{date syntax,,the Date section in the ffmpeg-utils(1) manual,ffmpeg-utils}.
315 @item -metadata[:metadata_specifier] @var{key}=@var{value} (@emph{output,per-metadata})
316 Set a metadata key/value pair.
318 An optional @var{metadata_specifier} may be given to set metadata
319 on streams or chapters. See @code{-map_metadata} documentation for
322 This option overrides metadata set with @code{-map_metadata}. It is
323 also possible to delete metadata by using an empty value.
325 For example, for setting the title in the output file:
327 ffmpeg -i in.avi -metadata title="my title" out.flv
330 To set the language of the first audio stream:
332 ffmpeg -i INPUT -metadata:s:a:1 language=eng OUTPUT
335 @item -target @var{type} (@emph{output})
336 Specify target file type (@code{vcd}, @code{svcd}, @code{dvd}, @code{dv},
337 @code{dv50}). @var{type} may be prefixed with @code{pal-}, @code{ntsc-} or
338 @code{film-} to use the corresponding standard. All the format options
339 (bitrate, codecs, buffer sizes) are then set automatically. You can just type:
342 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
345 Nevertheless you can specify additional options as long as you know
346 they do not conflict with the standard, as in:
349 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
352 @item -dframes @var{number} (@emph{output})
353 Set the number of data frames to record. This is an alias for @code{-frames:d}.
355 @item -frames[:@var{stream_specifier}] @var{framecount} (@emph{output,per-stream})
356 Stop writing to the stream after @var{framecount} frames.
358 @item -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
359 @itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
360 Use fixed quality scale (VBR). The meaning of @var{q}/@var{qscale} is
362 If @var{qscale} is used without a @var{stream_specifier} then it applies only
363 to the video stream, this is to maintain compatibility with previous behavior
364 and as specifying the same codec specific value to 2 different codecs that is
365 audio and video generally is not what is intended when no stream_specifier is
368 @anchor{filter_option}
369 @item -filter[:@var{stream_specifier}] @var{filtergraph} (@emph{output,per-stream})
370 Create the filtergraph specified by @var{filtergraph} and use it to
373 @var{filtergraph} is a description of the filtergraph to apply to
374 the stream, and must have a single input and a single output of the
375 same type of the stream. In the filtergraph, the input is associated
376 to the label @code{in}, and the output to the label @code{out}. See
377 the ffmpeg-filters manual for more information about the filtergraph
380 See the @ref{filter_complex_option,,-filter_complex option} if you
381 want to create filtergraphs with multiple inputs and/or outputs.
383 @item -filter_script[:@var{stream_specifier}] @var{filename} (@emph{output,per-stream})
384 This option is similar to @option{-filter}, the only difference is that its
385 argument is the name of the file from which a filtergraph description is to be
388 @item -pre[:@var{stream_specifier}] @var{preset_name} (@emph{output,per-stream})
389 Specify the preset for matching stream(s).
391 @item -stats (@emph{global})
392 Print encoding progress/statistics. It is on by default, to explicitly
393 disable it you need to specify @code{-nostats}.
395 @item -progress @var{url} (@emph{global})
396 Send program-friendly progress information to @var{url}.
398 Progress information is written approximately every second and at the end of
399 the encoding process. It is made of "@var{key}=@var{value}" lines. @var{key}
400 consists of only alphanumeric characters. The last key of a sequence of
401 progress information is always "progress".
404 Enable interaction on standard input. On by default unless standard input is
405 used as an input. To explicitly disable interaction you need to specify
408 Disabling interaction on standard input is useful, for example, if
409 ffmpeg is in the background process group. Roughly the same result can
410 be achieved with @code{ffmpeg ... < /dev/null} but it requires a
413 @item -debug_ts (@emph{global})
414 Print timestamp information. It is off by default. This option is
415 mostly useful for testing and debugging purposes, and the output
416 format may change from one version to another, so it should not be
417 employed by portable scripts.
419 See also the option @code{-fdebug ts}.
421 @item -attach @var{filename} (@emph{output})
422 Add an attachment to the output file. This is supported by a few formats
423 like Matroska for e.g. fonts used in rendering subtitles. Attachments
424 are implemented as a specific type of stream, so this option will add
425 a new stream to the file. It is then possible to use per-stream options
426 on this stream in the usual way. Attachment streams created with this
427 option will be created after all the other streams (i.e. those created
428 with @code{-map} or automatic mappings).
430 Note that for Matroska you also have to set the mimetype metadata tag:
432 ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
434 (assuming that the attachment stream will be third in the output file).
436 @item -dump_attachment[:@var{stream_specifier}] @var{filename} (@emph{input,per-stream})
437 Extract the matching attachment stream into a file named @var{filename}. If
438 @var{filename} is empty, then the value of the @code{filename} metadata tag
441 E.g. to extract the first attachment to a file named 'out.ttf':
443 ffmpeg -dump_attachment:t:0 out.ttf -i INPUT
445 To extract all attachments to files determined by the @code{filename} tag:
447 ffmpeg -dump_attachment:t "" -i INPUT
450 Technical note -- attachments are implemented as codec extradata, so this
451 option can actually be used to extract extradata from any stream, not just
456 @section Video Options
459 @item -vframes @var{number} (@emph{output})
460 Set the number of video frames to record. This is an alias for @code{-frames:v}.
461 @item -r[:@var{stream_specifier}] @var{fps} (@emph{input/output,per-stream})
462 Set frame rate (Hz value, fraction or abbreviation).
464 As an input option, ignore any timestamps stored in the file and instead
465 generate timestamps assuming constant frame rate @var{fps}.
467 As an output option, duplicate or drop input frames to achieve constant output
468 frame rate @var{fps}.
470 @item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})
473 As an input option, this is a shortcut for the @option{video_size} private
474 option, recognized by some demuxers for which the frame size is either not
475 stored in the file or is configurable -- e.g. raw video or video grabbers.
477 As an output option, this inserts the @code{scale} video filter to the
478 @emph{end} of the corresponding filtergraph. Please use the @code{scale} filter
479 directly to insert it at the beginning or some other place.
481 The format is @samp{wxh} (default - same as source).
483 @item -aspect[:@var{stream_specifier}] @var{aspect} (@emph{output,per-stream})
484 Set the video display aspect ratio specified by @var{aspect}.
486 @var{aspect} can be a floating point number string, or a string of the
487 form @var{num}:@var{den}, where @var{num} and @var{den} are the
488 numerator and denominator of the aspect ratio. For example "4:3",
489 "16:9", "1.3333", and "1.7777" are valid argument values.
491 If used together with @option{-vcodec copy}, it will affect the aspect ratio
492 stored at container level, but not the aspect ratio stored in encoded
493 frames, if it exists.
495 @item -vn (@emph{output})
496 Disable video recording.
498 @item -vcodec @var{codec} (@emph{output})
499 Set the video codec. This is an alias for @code{-codec:v}.
501 @item -pass[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
502 Select the pass number (1 or 2). It is used to do two-pass
503 video encoding. The statistics of the video are recorded in the first
504 pass into a log file (see also the option -passlogfile),
505 and in the second pass that log file is used to generate the video
506 at the exact requested bitrate.
507 On pass 1, you may just deactivate audio and set output to null,
508 examples for Windows and Unix:
510 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
511 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
514 @item -passlogfile[:@var{stream_specifier}] @var{prefix} (@emph{output,per-stream})
515 Set two-pass log file name prefix to @var{prefix}, the default file name
516 prefix is ``ffmpeg2pass''. The complete file name will be
517 @file{PREFIX-N.log}, where N is a number specific to the output
520 @item -vf @var{filtergraph} (@emph{output})
521 Create the filtergraph specified by @var{filtergraph} and use it to
524 This is an alias for @code{-filter:v}, see the @ref{filter_option,,-filter option}.
527 @section Advanced Video Options
530 @item -pix_fmt[:@var{stream_specifier}] @var{format} (@emph{input/output,per-stream})
531 Set pixel format. Use @code{-pix_fmts} to show all the supported
533 If the selected pixel format can not be selected, ffmpeg will print a
534 warning and select the best pixel format supported by the encoder.
535 If @var{pix_fmt} is prefixed by a @code{+}, ffmpeg will exit with an error
536 if the requested pixel format can not be selected, and automatic conversions
537 inside filtergraphs are disabled.
538 If @var{pix_fmt} is a single @code{+}, ffmpeg selects the same pixel format
539 as the input (or graph output) and automatic conversions are disabled.
541 @item -sws_flags @var{flags} (@emph{input/output})
546 @item -rc_override[:@var{stream_specifier}] @var{override} (@emph{output,per-stream})
547 Rate control override for specific intervals, formatted as "int,int,int"
548 list separated with slashes. Two first values are the beginning and
549 end frame numbers, last one is quantizer to use if positive, or quality
553 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
554 Use this option if your input file is interlaced and you want
555 to keep the interlaced format for minimum losses.
556 The alternative is to deinterlace the input stream with
557 @option{-deinterlace}, but deinterlacing introduces losses.
559 Calculate PSNR of compressed frames.
561 Dump video coding statistics to @file{vstats_HHMMSS.log}.
562 @item -vstats_file @var{file}
563 Dump video coding statistics to @var{file}.
564 @item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
565 top=1/bottom=0/auto=-1 field first
566 @item -dc @var{precision}
568 @item -vtag @var{fourcc/tag} (@emph{output})
569 Force video tag/fourcc. This is an alias for @code{-tag:v}.
570 @item -qphist (@emph{global})
572 @item -vbsf @var{bitstream_filter}
575 @item -force_key_frames[:@var{stream_specifier}] @var{time}[,@var{time}...] (@emph{output,per-stream})
576 @item -force_key_frames[:@var{stream_specifier}] expr:@var{expr} (@emph{output,per-stream})
577 Force key frames at the specified timestamps, more precisely at the first
578 frames after each specified time.
580 If the argument is prefixed with @code{expr:}, the string @var{expr}
581 is interpreted like an expression and is evaluated for each frame. A
582 key frame is forced in case the evaluation is non-zero.
584 If one of the times is "@code{chapters}[@var{delta}]", it is expanded into
585 the time of the beginning of all chapters in the file, shifted by
586 @var{delta}, expressed as a time in seconds.
587 This option can be useful to ensure that a seek point is present at a
588 chapter mark or any other designated place in the output file.
590 For example, to insert a key frame at 5 minutes, plus key frames 0.1 second
591 before the beginning of every chapter:
593 -force_key_frames 0:05:00,chapters-0.1
596 The expression in @var{expr} can contain the following constants:
599 the number of current processed frame, starting from 0
601 the number of forced frames
603 the number of the previous forced frame, it is @code{NAN} when no
604 keyframe was forced yet
606 the time of the previous forced frame, it is @code{NAN} when no
607 keyframe was forced yet
609 the time of the current processed frame
612 For example to force a key frame every 5 seconds, you can specify:
614 -force_key_frames expr:gte(t,n_forced*5)
617 To force a key frame 5 seconds after the time of the last forced one,
618 starting from second 13:
620 -force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5))
623 Note that forcing too many keyframes is very harmful for the lookahead
624 algorithms of certain encoders: using fixed-GOP options or similar
625 would be more efficient.
627 @item -copyinkf[:@var{stream_specifier}] (@emph{output,per-stream})
628 When doing stream copy, copy also non-key frames found at the
631 @item -hwaccel[:@var{stream_specifier}] @var{hwaccel} (@emph{input,per-stream})
632 Use hardware acceleration to decode the matching stream(s). The allowed values
633 of @var{hwaccel} are:
636 Do not use any hardware acceleration (the default).
639 Automatically select the hardware acceleration method.
642 Use VDPAU (Video Decode and Presentation API for Unix) hardware acceleration.
645 This option has no effect if the selected hwaccel is not available or not
646 supported by the chosen decoder.
648 Note that most acceleration methods are intended for playback and will not be
649 faster than software decoding on modern CPUs. Additionally, @command{ffmpeg}
650 will usually need to copy the decoded frames from the GPU memory into the system
651 memory, resulting in further performance loss. This option is thus mainly
654 @item -hwaccel_device[:@var{stream_specifier}] @var{hwaccel_device} (@emph{input,per-stream})
655 Select a device to use for hardware acceleration.
657 This option only makes sense when the @option{-hwaccel} option is also
658 specified. Its exact meaning depends on the specific hardware acceleration
663 For VDPAU, this option specifies the X11 display/screen to use. If this option
664 is not specified, the value of the @var{DISPLAY} environment variable is used
668 @section Audio Options
671 @item -aframes @var{number} (@emph{output})
672 Set the number of audio frames to record. This is an alias for @code{-frames:a}.
673 @item -ar[:@var{stream_specifier}] @var{freq} (@emph{input/output,per-stream})
674 Set the audio sampling frequency. For output streams it is set by
675 default to the frequency of the corresponding input stream. For input
676 streams this option only makes sense for audio grabbing devices and raw
677 demuxers and is mapped to the corresponding demuxer options.
678 @item -aq @var{q} (@emph{output})
679 Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
680 @item -ac[:@var{stream_specifier}] @var{channels} (@emph{input/output,per-stream})
681 Set the number of audio channels. For output streams it is set by
682 default to the number of input audio channels. For input streams
683 this option only makes sense for audio grabbing devices and raw demuxers
684 and is mapped to the corresponding demuxer options.
685 @item -an (@emph{output})
686 Disable audio recording.
687 @item -acodec @var{codec} (@emph{input/output})
688 Set the audio codec. This is an alias for @code{-codec:a}.
689 @item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt} (@emph{output,per-stream})
690 Set the audio sample format. Use @code{-sample_fmts} to get a list
691 of supported sample formats.
693 @item -af @var{filtergraph} (@emph{output})
694 Create the filtergraph specified by @var{filtergraph} and use it to
697 This is an alias for @code{-filter:a}, see the @ref{filter_option,,-filter option}.
700 @section Advanced Audio options:
703 @item -atag @var{fourcc/tag} (@emph{output})
704 Force audio tag/fourcc. This is an alias for @code{-tag:a}.
705 @item -absf @var{bitstream_filter}
707 @item -guess_layout_max @var{channels} (@emph{input,per-stream})
708 If some input channel layout is not known, try to guess only if it
709 corresponds to at most the specified number of channels. For example, 2
710 tells to @command{ffmpeg} to recognize 1 channel as mono and 2 channels as
711 stereo but not 6 channels as 5.1. The default is to always try to guess. Use
712 0 to disable all guessing.
715 @section Subtitle options:
718 @item -scodec @var{codec} (@emph{input/output})
719 Set the subtitle codec. This is an alias for @code{-codec:s}.
720 @item -sn (@emph{output})
721 Disable subtitle recording.
722 @item -sbsf @var{bitstream_filter}
726 @section Advanced Subtitle options:
730 @item -fix_sub_duration
731 Fix subtitles durations. For each subtitle, wait for the next packet in the
732 same stream and adjust the duration of the first to avoid overlap. This is
733 necessary with some subtitles codecs, especially DVB subtitles, because the
734 duration in the original packet is only a rough estimate and the end is
735 actually marked by an empty subtitle frame. Failing to use this option when
736 necessary can result in exaggerated durations or muxing failures due to
737 non-monotonic timestamps.
739 Note that this option will delay the output of all data until the next
740 subtitle packet is decoded: it may increase memory consumption and latency a
743 @item -canvas_size @var{size}
744 Set the size of the canvas used to render subtitles.
748 @section Advanced options
751 @item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] | @var{[linklabel]} (@emph{output})
753 Designate one or more input streams as a source for the output file. Each input
754 stream is identified by the input file index @var{input_file_id} and
755 the input stream index @var{input_stream_id} within the input
756 file. Both indices start at 0. If specified,
757 @var{sync_file_id}:@var{stream_specifier} sets which input stream
758 is used as a presentation sync reference.
760 The first @code{-map} option on the command line specifies the
761 source for output stream 0, the second @code{-map} option specifies
762 the source for output stream 1, etc.
764 A @code{-} character before the stream identifier creates a "negative" mapping.
765 It disables matching streams from already created mappings.
767 An alternative @var{[linklabel]} form will map outputs from complex filter
768 graphs (see the @option{-filter_complex} option) to the output file.
769 @var{linklabel} must correspond to a defined output link label in the graph.
771 For example, to map ALL streams from the first input file to output
773 ffmpeg -i INPUT -map 0 output
776 For example, if you have two audio streams in the first input file,
777 these streams are identified by "0:0" and "0:1". You can use
778 @code{-map} to select which streams to place in an output file. For
781 ffmpeg -i INPUT -map 0:1 out.wav
783 will map the input stream in @file{INPUT} identified by "0:1" to
784 the (single) output stream in @file{out.wav}.
786 For example, to select the stream with index 2 from input file
787 @file{a.mov} (specified by the identifier "0:2"), and stream with
788 index 6 from input @file{b.mov} (specified by the identifier "1:6"),
789 and copy them to the output file @file{out.mov}:
791 ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
794 To select all video and the third audio stream from an input file:
796 ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
799 To map all the streams except the second audio, use negative mappings
801 ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
804 Note that using this option disables the default mappings for this output file.
806 @item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][:@var{output_file_id}.@var{stream_specifier}]
807 Map an audio channel from a given input to an output. If
808 @var{output_file_id}.@var{stream_specifier} is not set, the audio channel will
809 be mapped on all the audio streams.
811 Using "-1" instead of
812 @var{input_file_id}.@var{stream_specifier}.@var{channel_id} will map a muted
815 For example, assuming @var{INPUT} is a stereo audio file, you can switch the
816 two audio channels with the following command:
818 ffmpeg -i INPUT -map_channel 0.0.1 -map_channel 0.0.0 OUTPUT
821 If you want to mute the first channel and keep the second:
823 ffmpeg -i INPUT -map_channel -1 -map_channel 0.0.1 OUTPUT
826 The order of the "-map_channel" option specifies the order of the channels in
827 the output stream. The output channel layout is guessed from the number of
828 channels mapped (mono if one "-map_channel", stereo if two, etc.). Using "-ac"
829 in combination of "-map_channel" makes the channel gain levels to be updated if
830 input and output channel layouts don't match (for instance two "-map_channel"
831 options and "-ac 6").
833 You can also extract each channel of an input to specific outputs; the following
834 command extracts two channels of the @var{INPUT} audio stream (file 0, stream 0)
835 to the respective @var{OUTPUT_CH0} and @var{OUTPUT_CH1} outputs:
837 ffmpeg -i INPUT -map_channel 0.0.0 OUTPUT_CH0 -map_channel 0.0.1 OUTPUT_CH1
840 The following example splits the channels of a stereo input into two separate
841 streams, which are put into the same output file:
843 ffmpeg -i stereo.wav -map 0:0 -map 0:0 -map_channel 0.0.0:0.0 -map_channel 0.0.1:0.1 -y out.ogg
846 Note that currently each output stream can only contain channels from a single
847 input stream; you can't for example use "-map_channel" to pick multiple input
848 audio channels contained in different streams (from the same or different files)
849 and merge them into a single output stream. It is therefore not currently
850 possible, for example, to turn two separate mono streams into a single stereo
851 stream. However splitting a stereo stream into two single channel mono streams
854 If you need this feature, a possible workaround is to use the @emph{amerge}
855 filter. For example, if you need to merge a media (here @file{input.mkv}) with 2
856 mono audio streams into one single stereo channel audio stream (and keep the
857 video stream), you can use the following command:
859 ffmpeg -i input.mkv -filter_complex "[0:1] [0:2] amerge" -c:a pcm_s16le -c:v copy output.mkv
862 @item -map_metadata[:@var{metadata_spec_out}] @var{infile}[:@var{metadata_spec_in}] (@emph{output,per-metadata})
863 Set metadata information of the next output file from @var{infile}. Note that
864 those are file indices (zero-based), not filenames.
865 Optional @var{metadata_spec_in/out} parameters specify, which metadata to copy.
866 A metadata specifier can have the following forms:
869 global metadata, i.e. metadata that applies to the whole file
871 @item @var{s}[:@var{stream_spec}]
872 per-stream metadata. @var{stream_spec} is a stream specifier as described
873 in the @ref{Stream specifiers} chapter. In an input metadata specifier, the first
874 matching stream is copied from. In an output metadata specifier, all matching
875 streams are copied to.
877 @item @var{c}:@var{chapter_index}
878 per-chapter metadata. @var{chapter_index} is the zero-based chapter index.
880 @item @var{p}:@var{program_index}
881 per-program metadata. @var{program_index} is the zero-based program index.
883 If metadata specifier is omitted, it defaults to global.
885 By default, global metadata is copied from the first input file,
886 per-stream and per-chapter metadata is copied along with streams/chapters. These
887 default mappings are disabled by creating any mapping of the relevant type. A negative
888 file index can be used to create a dummy mapping that just disables automatic copying.
890 For example to copy metadata from the first stream of the input file to global metadata
893 ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
896 To do the reverse, i.e. copy global metadata to all audio streams:
898 ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
900 Note that simple @code{0} would work as well in this example, since global
901 metadata is assumed by default.
903 @item -map_chapters @var{input_file_index} (@emph{output})
904 Copy chapters from input file with index @var{input_file_index} to the next
905 output file. If no chapter mapping is specified, then chapters are copied from
906 the first input file with at least one chapter. Use a negative file index to
907 disable any chapter copying.
909 @item -benchmark (@emph{global})
910 Show benchmarking information at the end of an encode.
911 Shows CPU time used and maximum memory consumption.
912 Maximum memory consumption is not supported on all systems,
913 it will usually display as 0 if not supported.
914 @item -benchmark_all (@emph{global})
915 Show benchmarking information during the encode.
916 Shows CPU time used in various steps (audio/video encode/decode).
917 @item -timelimit @var{duration} (@emph{global})
918 Exit after ffmpeg has been running for @var{duration} seconds.
919 @item -dump (@emph{global})
920 Dump each input packet to stderr.
921 @item -hex (@emph{global})
922 When dumping packets, also dump the payload.
923 @item -re (@emph{input})
924 Read input at native frame rate. Mainly used to simulate a grab device.
925 or live input stream (e.g. when reading from a file). Should not be used
926 with actual grab devices or live input streams (where it can cause packet
928 By default @command{ffmpeg} attempts to read the input(s) as fast as possible.
929 This option will slow down the reading of the input(s) to the native frame rate
930 of the input(s). It is useful for real-time output (e.g. live streaming).
932 Loop over the input stream. Currently it works only for image
933 streams. This option is used for automatic FFserver testing.
934 This option is deprecated, use -loop 1.
935 @item -loop_output @var{number_of_times}
936 Repeatedly loop output for formats that support looping such as animated GIF
937 (0 will loop the output infinitely).
938 This option is deprecated, use -loop.
939 @item -vsync @var{parameter}
941 For compatibility reasons old values can be specified as numbers.
942 Newly added values will have to be specified as strings always.
946 Each frame is passed with its timestamp from the demuxer to the muxer.
948 Frames will be duplicated and dropped to achieve exactly the requested
951 Frames are passed through with their timestamp or dropped so as to
952 prevent 2 frames from having the same timestamp.
954 As passthrough but destroys all timestamps, making the muxer generate
955 fresh timestamps based on frame-rate.
957 Chooses between 1 and 2 depending on muxer capabilities. This is the
961 Note that the timestamps may be further modified by the muxer, after this.
962 For example, in the case that the format option @option{avoid_negative_ts}
965 With -map you can select from which stream the timestamps should be
966 taken. You can leave either video or audio unchanged and sync the
967 remaining stream(s) to the unchanged one.
969 @item -async @var{samples_per_second}
970 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
971 the parameter is the maximum samples per second by which the audio is changed.
972 -async 1 is a special case where only the start of the audio stream is corrected
973 without any later correction.
975 Note that the timestamps may be further modified by the muxer, after this.
976 For example, in the case that the format option @option{avoid_negative_ts}
979 This option has been deprecated. Use the @code{aresample} audio filter instead.
982 Do not process input timestamps, but keep their values without trying
983 to sanitize them. In particular, do not remove the initial start time
986 Note that, depending on the @option{vsync} option or on specific muxer
987 processing (e.g. in case the format option @option{avoid_negative_ts}
988 is enabled) the output timestamps may mismatch with the input
989 timestamps even when this option is selected.
991 @item -copytb @var{mode}
992 Specify how to set the encoder timebase when stream copying. @var{mode} is an
993 integer numeric value, and can assume one of the following values:
997 Use the demuxer timebase.
999 The time base is copied to the output encoder from the corresponding input
1000 demuxer. This is sometimes required to avoid non monotonically increasing
1001 timestamps when copying video streams with variable frame rate.
1004 Use the decoder timebase.
1006 The time base is copied to the output encoder from the corresponding input
1010 Try to make the choice automatically, in order to generate a sane output.
1013 Default value is -1.
1015 @item -shortest (@emph{output})
1016 Finish encoding when the shortest input stream ends.
1017 @item -dts_delta_threshold
1018 Timestamp discontinuity delta threshold.
1019 @item -muxdelay @var{seconds} (@emph{input})
1020 Set the maximum demux-decode delay.
1021 @item -muxpreload @var{seconds} (@emph{input})
1022 Set the initial demux-decode delay.
1023 @item -streamid @var{output-stream-index}:@var{new-value} (@emph{output})
1024 Assign a new stream-id value to an output stream. This option should be
1025 specified prior to the output filename to which it applies.
1026 For the situation where multiple output files exist, a streamid
1027 may be reassigned to a different value.
1029 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
1030 an output mpegts file:
1032 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
1035 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
1036 Set bitstream filters for matching streams. @var{bitstream_filters} is
1037 a comma-separated list of bitstream filters. Use the @code{-bsfs} option
1038 to get the list of bitstream filters.
1040 ffmpeg -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264
1043 ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
1046 @item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{input/output,per-stream})
1047 Force a tag/fourcc for matching streams.
1049 @item -timecode @var{hh}:@var{mm}:@var{ss}SEP@var{ff}
1050 Specify Timecode for writing. @var{SEP} is ':' for non drop timecode and ';'
1053 ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
1056 @anchor{filter_complex_option}
1057 @item -filter_complex @var{filtergraph} (@emph{global})
1058 Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
1059 outputs. For simple graphs -- those with one input and one output of the same
1060 type -- see the @option{-filter} options. @var{filtergraph} is a description of
1061 the filtergraph, as described in the ``Filtergraph syntax'' section of the
1062 ffmpeg-filters manual.
1064 Input link labels must refer to input streams using the
1065 @code{[file_index:stream_specifier]} syntax (i.e. the same as @option{-map}
1066 uses). If @var{stream_specifier} matches multiple streams, the first one will be
1067 used. An unlabeled input will be connected to the first unused input stream of
1070 Output link labels are referred to with @option{-map}. Unlabeled outputs are
1071 added to the first output file.
1073 Note that with this option it is possible to use only lavfi sources without
1076 For example, to overlay an image over video
1078 ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
1081 Here @code{[0:v]} refers to the first video stream in the first input file,
1082 which is linked to the first (main) input of the overlay filter. Similarly the
1083 first video stream in the second input is linked to the second (overlay) input
1086 Assuming there is only one video stream in each input file, we can omit input
1087 labels, so the above is equivalent to
1089 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map
1093 Furthermore we can omit the output label and the single output from the filter
1094 graph will be added to the output file automatically, so we can simply write
1096 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
1099 To generate 5 seconds of pure red video using lavfi @code{color} source:
1101 ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
1104 @item -lavfi @var{filtergraph} (@emph{global})
1105 Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
1106 outputs. Equivalent to @option{-filter_complex}.
1108 @item -filter_complex_script @var{filename} (@emph{global})
1109 This option is similar to @option{-filter_complex}, the only difference is that
1110 its argument is the name of the file from which a complex filtergraph
1111 description is to be read.
1113 @item -accurate_seek (@emph{input})
1114 This option enables or disables accurate seeking in input files with the
1115 @option{-ss} option. It is enabled by default, so seeking is accurate when
1116 transcoding. Use @option{-noaccurate_seek} to disable it, which may be useful
1117 e.g. when copying some streams and transcoding the others.
1119 @item -override_ffserver (@emph{global})
1120 Overrides the input specifications from @command{ffserver}. Using this
1121 option you can map any input stream to @command{ffserver} and control
1122 many aspects of the encoding from @command{ffmpeg}. Without this
1123 option @command{ffmpeg} will transmit to @command{ffserver} what is
1124 requested by @command{ffserver}.
1126 The option is intended for cases where features are needed that cannot be
1127 specified to @command{ffserver} but can be to @command{ffmpeg}.
1131 As a special exception, you can use a bitmap subtitle stream as input: it
1132 will be converted into a video with the same size as the largest video in
1133 the file, or 720x576 if no video is present. Note that this is an
1134 experimental and temporary solution. It will be removed once libavfilter has
1135 proper support for subtitles.
1137 For example, to hardcode subtitles on top of a DVB-T recording stored in
1138 MPEG-TS format, delaying the subtitles by 1 second:
1140 ffmpeg -i input.ts -filter_complex \
1141 '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
1142 -sn -map '#0x2dc' output.mkv
1144 (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video,
1145 audio and subtitles streams; 0:0, 0:3 and 0:7 would have worked too)
1147 @section Preset files
1148 A preset file contains a sequence of @var{option}=@var{value} pairs,
1149 one for each line, specifying a sequence of options which would be
1150 awkward to specify on the command line. Lines starting with the hash
1151 ('#') character are ignored and are used to provide comments. Check
1152 the @file{presets} directory in the FFmpeg source tree for examples.
1154 Preset files are specified with the @code{vpre}, @code{apre},
1155 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
1156 filename of the preset instead of a preset name as input and can be
1157 used for any kind of codec. For the @code{vpre}, @code{apre}, and
1158 @code{spre} options, the options specified in a preset file are
1159 applied to the currently selected codec of the same type as the preset
1162 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
1163 preset options identifies the preset file to use according to the
1166 First ffmpeg searches for a file named @var{arg}.ffpreset in the
1167 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
1168 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
1169 or in a @file{ffpresets} folder along the executable on win32,
1170 in that order. For example, if the argument is @code{libvpx-1080p}, it will
1171 search for the file @file{libvpx-1080p.ffpreset}.
1173 If no such file is found, then ffmpeg will search for a file named
1174 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
1175 directories, where @var{codec_name} is the name of the codec to which
1176 the preset file options will be applied. For example, if you select
1177 the video codec with @code{-vcodec libvpx} and use @code{-vpre 1080p},
1178 then it will search for the file @file{libvpx-1080p.ffpreset}.
1186 For streaming at very low bitrates, use a low frame rate
1187 and a small GOP size. This is especially true for RealVideo where
1188 the Linux player does not seem to be very fast, so it can miss
1189 frames. An example is:
1192 ffmpeg -g 3 -r 3 -t 10 -b:v 50k -s qcif -f rv10 /tmp/b.rm
1196 The parameter 'q' which is displayed while encoding is the current
1197 quantizer. The value 1 indicates that a very good quality could
1198 be achieved. The value 31 indicates the worst quality. If q=31 appears
1199 too often, it means that the encoder cannot compress enough to meet
1200 your bitrate. You must either increase the bitrate, decrease the
1201 frame rate or decrease the frame size.
1204 If your computer is not fast enough, you can speed up the
1205 compression at the expense of the compression ratio. You can use
1206 '-me zero' to speed up motion estimation, and '-g 0' to disable
1207 motion estimation completely (you have only I-frames, which means it
1208 is about as good as JPEG compression).
1211 To have very low audio bitrates, reduce the sampling frequency
1212 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
1215 To have a constant quality (but a variable bitrate), use the option
1216 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
1223 @c man begin EXAMPLES
1225 @section Preset files
1227 A preset file contains a sequence of @var{option=value} pairs, one for
1228 each line, specifying a sequence of options which can be specified also on
1229 the command line. Lines starting with the hash ('#') character are ignored and
1230 are used to provide comments. Empty lines are also ignored. Check the
1231 @file{presets} directory in the FFmpeg source tree for examples.
1233 Preset files are specified with the @code{pre} option, this option takes a
1234 preset name as input. FFmpeg searches for a file named @var{preset_name}.avpreset in
1235 the directories @file{$AVCONV_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
1236 the data directory defined at configuration time (usually @file{$PREFIX/share/ffmpeg})
1237 in that order. For example, if the argument is @code{libx264-max}, it will
1238 search for the file @file{libx264-max.avpreset}.
1240 @section Video and Audio grabbing
1242 If you specify the input format and device then ffmpeg can grab video
1246 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
1249 Or with an ALSA audio source (mono input, card id 1) instead of OSS:
1251 ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg
1254 Note that you must activate the right video source and channel before
1255 launching ffmpeg with any TV viewer such as
1256 @uref{http://linux.bytesex.org/xawtv/, xawtv} by Gerd Knorr. You also
1257 have to set the audio recording levels correctly with a
1260 @section X11 grabbing
1262 Grab the X11 display with ffmpeg via
1265 ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg
1268 0.0 is display.screen number of your X11 server, same as
1269 the DISPLAY environment variable.
1272 ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg
1275 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
1276 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
1278 @section Video and Audio file format conversion
1280 Any supported file format and protocol can serve as input to ffmpeg:
1285 You can use YUV files as input:
1288 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
1291 It will use the files:
1293 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
1294 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
1297 The Y files use twice the resolution of the U and V files. They are
1298 raw files, without header. They can be generated by all decent video
1299 decoders. You must specify the size of the image with the @option{-s} option
1300 if ffmpeg cannot guess it.
1303 You can input from a raw YUV420P file:
1306 ffmpeg -i /tmp/test.yuv /tmp/out.avi
1309 test.yuv is a file containing raw YUV planar data. Each frame is composed
1310 of the Y plane followed by the U and V planes at half vertical and
1311 horizontal resolution.
1314 You can output to a raw YUV420P file:
1317 ffmpeg -i mydivx.avi hugefile.yuv
1321 You can set several input files and output files:
1324 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
1327 Converts the audio file a.wav and the raw YUV video file a.yuv
1331 You can also do audio and video conversions at the same time:
1334 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
1337 Converts a.wav to MPEG audio at 22050 Hz sample rate.
1340 You can encode to several formats at the same time and define a
1341 mapping from input stream to output streams:
1344 ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2
1347 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
1348 file:index' specifies which input stream is used for each output
1349 stream, in the order of the definition of output streams.
1352 You can transcode decrypted VOBs:
1355 ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
1358 This is a typical DVD ripping example; the input is a VOB file, the
1359 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
1360 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
1361 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
1362 input video. Furthermore, the audio stream is MP3-encoded so you need
1363 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
1364 The mapping is particularly useful for DVD transcoding
1365 to get the desired audio language.
1367 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
1370 You can extract images from a video, or create a video from many images:
1372 For extracting images from a video:
1374 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1377 This will extract one video frame per second from the video and will
1378 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1379 etc. Images will be rescaled to fit the new WxH values.
1381 If you want to extract just a limited number of frames, you can use the
1382 above command in combination with the -vframes or -t option, or in
1383 combination with -ss to start extracting from a certain point in time.
1385 For creating a video from many images:
1387 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1390 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1391 composed of three digits padded with zeroes to express the sequence
1392 number. It is the same syntax supported by the C printf function, but
1393 only formats accepting a normal integer are suitable.
1395 When importing an image sequence, -i also supports expanding
1396 shell-like wildcard patterns (globbing) internally, by selecting the
1397 image2-specific @code{-pattern_type glob} option.
1399 For example, for creating a video from filenames matching the glob pattern
1402 ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi
1406 You can put many streams of the same type in the output:
1409 ffmpeg -i test1.avi -i test2.avi -map 0:3 -map 0:2 -map 0:1 -map 0:0 -c copy test12.nut
1412 The resulting output file @file{test12.avi} will contain first four streams from
1413 the input file in reverse order.
1416 To force CBR video output:
1418 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
1422 The four options lmin, lmax, mblmin and mblmax use 'lambda' units,
1423 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
1425 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
1431 @include config.texi
1433 @ifset config-avutil
1436 @ifset config-avcodec
1437 @include codecs.texi
1438 @include bitstream_filters.texi
1440 @ifset config-avformat
1441 @include formats.texi
1442 @include protocols.texi
1444 @ifset config-avdevice
1445 @include devices.texi
1447 @ifset config-swresample
1448 @include resampler.texi
1450 @ifset config-swscale
1451 @include scaler.texi
1453 @ifset config-avfilter
1454 @include filters.texi
1462 @url{ffmpeg.html,ffmpeg}
1464 @ifset config-not-all
1465 @url{ffmpeg-all.html,ffmpeg-all},
1467 @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe}, @url{ffserver.html,ffserver},
1468 @url{ffmpeg-utils.html,ffmpeg-utils},
1469 @url{ffmpeg-scaler.html,ffmpeg-scaler},
1470 @url{ffmpeg-resampler.html,ffmpeg-resampler},
1471 @url{ffmpeg-codecs.html,ffmpeg-codecs},
1472 @url{ffmpeg-bitstream-filters.html,ffmpeg-bitstream-filters},
1473 @url{ffmpeg-formats.html,ffmpeg-formats},
1474 @url{ffmpeg-devices.html,ffmpeg-devices},
1475 @url{ffmpeg-protocols.html,ffmpeg-protocols},
1476 @url{ffmpeg-filters.html,ffmpeg-filters}
1483 @ifset config-not-all
1486 ffplay(1), ffprobe(1), ffserver(1),
1487 ffmpeg-utils(1), ffmpeg-scaler(1), ffmpeg-resampler(1),
1488 ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
1489 ffmpeg-devices(1), ffmpeg-protocols(1), ffmpeg-filters(1)
1492 @include authors.texi
1497 @settitle ffmpeg video converter