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 |_______| |______________| |
93 ________ ______________ |_________|
95 | output | <-------- | encoded data | <----+
96 | file | muxer | packets | encoder
97 |________| |______________|
102 @command{ffmpeg} calls the libavformat library (containing demuxers) to read
103 input files and get packets containing encoded data from them. When there are
104 multiple input files, @command{ffmpeg} tries to keep them synchronized by
105 tracking lowest timestamp on any active input stream.
107 Encoded packets are then passed to the decoder (unless streamcopy is selected
108 for the stream, see further for a description). The decoder produces
109 uncompressed frames (raw video/PCM audio/...) which can be processed further by
110 filtering (see next section). After filtering, the frames are passed to the
111 encoder, which encodes them and outputs encoded packets. Finally those are
112 passed to the muxer, which writes the encoded packets to the output file.
115 Before encoding, @command{ffmpeg} can process raw audio and video frames using
116 filters from the libavfilter library. Several chained filters form a filter
117 graph. @command{ffmpeg} distinguishes between two types of filtergraphs:
120 @subsection Simple filtergraphs
121 Simple filtergraphs are those that have exactly one input and output, both of
122 the same type. In the above diagram they can be represented by simply inserting
123 an additional step between decoding and encoding:
126 _________ __________ ______________
128 | decoded | fltrgrph | filtered | encoder | encoded data |
129 | frames | ----------> | frames | ---------> | packets |
130 |_________| |__________| |______________|
134 Simple filtergraphs are configured with the per-stream @option{-filter} option
135 (with @option{-vf} and @option{-af} aliases for video and audio respectively).
136 A simple filtergraph for video can look for example like this:
139 _______ _____________ _______ ________
141 | input | ---> | deinterlace | ---> | scale | ---> | output |
142 |_______| |_____________| |_______| |________|
146 Note that some filters change frame properties but not frame contents. E.g. the
147 @code{fps} filter in the example above changes number of frames, but does not
148 touch the frame contents. Another example is the @code{setpts} filter, which
149 only sets timestamps and otherwise passes the frames unchanged.
151 @subsection Complex filtergraphs
152 Complex filtergraphs are those which cannot be described as simply a linear
153 processing chain applied to one stream. This is the case, for example, when the graph has
154 more than one input and/or output, or when output stream type is different from
155 input. They can be represented with the following diagram:
160 | input 0 |\ __________
162 \ _________ /| output 0 |
164 _________ \| complex | /
166 | input 1 |---->| filter |\
167 |_________| | | \ __________
170 _________ / |_________| |__________|
177 Complex filtergraphs are configured with the @option{-filter_complex} option.
178 Note that this option is global, since a complex filtergraph, by its nature,
179 cannot be unambiguously associated with a single stream or file.
181 The @option{-lavfi} option is equivalent to @option{-filter_complex}.
183 A trivial example of a complex filtergraph is the @code{overlay} filter, which
184 has two video inputs and one video output, containing one video overlaid on top
185 of the other. Its audio counterpart is the @code{amix} filter.
188 Stream copy is a mode selected by supplying the @code{copy} parameter to the
189 @option{-codec} option. It makes @command{ffmpeg} omit the decoding and encoding
190 step for the specified stream, so it does only demuxing and muxing. It is useful
191 for changing the container format or modifying container-level metadata. The
192 diagram above will, in this case, simplify to this:
195 _______ ______________ ________
197 | input | demuxer | encoded data | muxer | output |
198 | file | ---------> | packets | -------> | file |
199 |_______| |______________| |________|
203 Since there is no decoding or encoding, it is very fast and there is no quality
204 loss. However, it might not work in some cases because of many factors. Applying
205 filters is obviously also impossible, since filters work on uncompressed data.
207 @c man end DETAILED DESCRIPTION
209 @chapter Stream selection
210 @c man begin STREAM SELECTION
212 By default, @command{ffmpeg} includes only one stream of each type (video, audio, subtitle)
213 present in the input files and adds them to each output file. It picks the
214 "best" of each based upon the following criteria: for video, it is the stream
215 with the highest resolution, for audio, it is the stream with the most channels, for
216 subtitles, it is the first subtitle stream. In the case where several streams of
217 the same type rate equally, the stream with the lowest index is chosen.
219 You can disable some of those defaults by using the @code{-vn/-an/-sn} options. For
220 full manual control, use the @code{-map} option, which disables the defaults just
223 @c man end STREAM SELECTION
228 @include fftools-common-opts.texi
230 @section Main options
234 @item -f @var{fmt} (@emph{input/output})
235 Force input or output file format. The format is normally auto detected for input
236 files and guessed from the file extension for output files, so this option is not
237 needed in most cases.
239 @item -i @var{filename} (@emph{input})
242 @item -y (@emph{global})
243 Overwrite output files without asking.
245 @item -n (@emph{global})
246 Do not overwrite output files, and exit immediately if a specified
247 output file already exists.
249 @item -c[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
250 @itemx -codec[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
251 Select an encoder (when used before an output file) or a decoder (when used
252 before an input file) for one or more streams. @var{codec} is the name of a
253 decoder/encoder or a special value @code{copy} (output only) to indicate that
254 the stream is not to be re-encoded.
258 ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
260 encodes all video streams with libx264 and copies all audio streams.
262 For each stream, the last matching @code{c} option is applied, so
264 ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
266 will copy all the streams except the second video, which will be encoded with
267 libx264, and the 138th audio, which will be encoded with libvorbis.
269 @item -t @var{duration} (@emph{output})
270 Stop writing the output after its duration reaches @var{duration}.
271 @var{duration} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.
273 -to and -t are mutually exclusive and -t has priority.
275 @item -to @var{position} (@emph{output})
276 Stop writing the output at @var{position}.
277 @var{position} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.
279 -to and -t are mutually exclusive and -t has priority.
281 @item -fs @var{limit_size} (@emph{output})
282 Set the file size limit, expressed in bytes.
284 @item -ss @var{position} (@emph{input/output})
285 When used as an input option (before @code{-i}), seeks in this input file to
286 @var{position}. Note the in most formats it is not possible to seek exactly, so
287 @command{ffmpeg} will seek to the closest seek point before @var{position}.
288 When transcoding and @option{-accurate_seek} is enabled (the default), this
289 extra segment between the seek point and @var{position} will be decoded and
290 discarded. When doing stream copy or when @option{-noaccurate_seek} is used, it
293 When used as an output option (before an output filename), decodes but discards
294 input until the timestamps reach @var{position}.
296 @var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
298 @item -itsoffset @var{offset} (@emph{input})
299 Set the input time offset.
301 @var{offset} must be a time duration specification,
302 see @ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}.
304 The offset is added to the timestamps of the input files. Specifying
305 a positive offset means that the corresponding streams are delayed by
306 the time duration specified in @var{offset}.
308 @item -timestamp @var{date} (@emph{output})
309 Set the recording timestamp in the container.
311 @var{date} must be a time duration specification,
312 see @ref{date syntax,,the Date section in the ffmpeg-utils(1) manual,ffmpeg-utils}.
314 @item -metadata[:metadata_specifier] @var{key}=@var{value} (@emph{output,per-metadata})
315 Set a metadata key/value pair.
317 An optional @var{metadata_specifier} may be given to set metadata
318 on streams or chapters. See @code{-map_metadata} documentation for
321 This option overrides metadata set with @code{-map_metadata}. It is
322 also possible to delete metadata by using an empty value.
324 For example, for setting the title in the output file:
326 ffmpeg -i in.avi -metadata title="my title" out.flv
329 To set the language of the first audio stream:
331 ffmpeg -i INPUT -metadata:s:a:1 language=eng OUTPUT
334 @item -target @var{type} (@emph{output})
335 Specify target file type (@code{vcd}, @code{svcd}, @code{dvd}, @code{dv},
336 @code{dv50}). @var{type} may be prefixed with @code{pal-}, @code{ntsc-} or
337 @code{film-} to use the corresponding standard. All the format options
338 (bitrate, codecs, buffer sizes) are then set automatically. You can just type:
341 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
344 Nevertheless you can specify additional options as long as you know
345 they do not conflict with the standard, as in:
348 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
351 @item -dframes @var{number} (@emph{output})
352 Set the number of data frames to record. This is an alias for @code{-frames:d}.
354 @item -frames[:@var{stream_specifier}] @var{framecount} (@emph{output,per-stream})
355 Stop writing to the stream after @var{framecount} frames.
357 @item -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
358 @itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
359 Use fixed quality scale (VBR). The meaning of @var{q}/@var{qscale} is
361 If @var{qscale} is used without a @var{stream_specifier} then it applies only
362 to the video stream, this is to maintain compatibility with previous behavior
363 and as specifying the same codec specific value to 2 different codecs that is
364 audio and video generally is not what is intended when no stream_specifier is
367 @anchor{filter_option}
368 @item -filter[:@var{stream_specifier}] @var{filtergraph} (@emph{output,per-stream})
369 Create the filtergraph specified by @var{filtergraph} and use it to
372 @var{filtergraph} is a description of the filtergraph to apply to
373 the stream, and must have a single input and a single output of the
374 same type of the stream. In the filtergraph, the input is associated
375 to the label @code{in}, and the output to the label @code{out}. See
376 the ffmpeg-filters manual for more information about the filtergraph
379 See the @ref{filter_complex_option,,-filter_complex option} if you
380 want to create filtergraphs with multiple inputs and/or outputs.
382 @item -filter_script[:@var{stream_specifier}] @var{filename} (@emph{output,per-stream})
383 This option is similar to @option{-filter}, the only difference is that its
384 argument is the name of the file from which a filtergraph description is to be
387 @item -pre[:@var{stream_specifier}] @var{preset_name} (@emph{output,per-stream})
388 Specify the preset for matching stream(s).
390 @item -stats (@emph{global})
391 Print encoding progress/statistics. It is on by default, to explicitly
392 disable it you need to specify @code{-nostats}.
394 @item -progress @var{url} (@emph{global})
395 Send program-friendly progress information to @var{url}.
397 Progress information is written approximately every second and at the end of
398 the encoding process. It is made of "@var{key}=@var{value}" lines. @var{key}
399 consists of only alphanumeric characters. The last key of a sequence of
400 progress information is always "progress".
403 Enable interaction on standard input. On by default unless standard input is
404 used as an input. To explicitly disable interaction you need to specify
407 Disabling interaction on standard input is useful, for example, if
408 ffmpeg is in the background process group. Roughly the same result can
409 be achieved with @code{ffmpeg ... < /dev/null} but it requires a
412 @item -debug_ts (@emph{global})
413 Print timestamp information. It is off by default. This option is
414 mostly useful for testing and debugging purposes, and the output
415 format may change from one version to another, so it should not be
416 employed by portable scripts.
418 See also the option @code{-fdebug ts}.
420 @item -attach @var{filename} (@emph{output})
421 Add an attachment to the output file. This is supported by a few formats
422 like Matroska for e.g. fonts used in rendering subtitles. Attachments
423 are implemented as a specific type of stream, so this option will add
424 a new stream to the file. It is then possible to use per-stream options
425 on this stream in the usual way. Attachment streams created with this
426 option will be created after all the other streams (i.e. those created
427 with @code{-map} or automatic mappings).
429 Note that for Matroska you also have to set the mimetype metadata tag:
431 ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
433 (assuming that the attachment stream will be third in the output file).
435 @item -dump_attachment[:@var{stream_specifier}] @var{filename} (@emph{input,per-stream})
436 Extract the matching attachment stream into a file named @var{filename}. If
437 @var{filename} is empty, then the value of the @code{filename} metadata tag
440 E.g. to extract the first attachment to a file named 'out.ttf':
442 ffmpeg -dump_attachment:t:0 out.ttf -i INPUT
444 To extract all attachments to files determined by the @code{filename} tag:
446 ffmpeg -dump_attachment:t "" -i INPUT
449 Technical note -- attachments are implemented as codec extradata, so this
450 option can actually be used to extract extradata from any stream, not just
455 @section Video Options
458 @item -vframes @var{number} (@emph{output})
459 Set the number of video frames to record. This is an alias for @code{-frames:v}.
460 @item -r[:@var{stream_specifier}] @var{fps} (@emph{input/output,per-stream})
461 Set frame rate (Hz value, fraction or abbreviation).
463 As an input option, ignore any timestamps stored in the file and instead
464 generate timestamps assuming constant frame rate @var{fps}.
466 As an output option, duplicate or drop input frames to achieve constant output
467 frame rate @var{fps}.
469 @item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})
472 As an input option, this is a shortcut for the @option{video_size} private
473 option, recognized by some demuxers for which the frame size is either not
474 stored in the file or is configurable -- e.g. raw video or video grabbers.
476 As an output option, this inserts the @code{scale} video filter to the
477 @emph{end} of the corresponding filtergraph. Please use the @code{scale} filter
478 directly to insert it at the beginning or some other place.
480 The format is @samp{wxh} (default - same as source).
482 @item -aspect[:@var{stream_specifier}] @var{aspect} (@emph{output,per-stream})
483 Set the video display aspect ratio specified by @var{aspect}.
485 @var{aspect} can be a floating point number string, or a string of the
486 form @var{num}:@var{den}, where @var{num} and @var{den} are the
487 numerator and denominator of the aspect ratio. For example "4:3",
488 "16:9", "1.3333", and "1.7777" are valid argument values.
490 If used together with @option{-vcodec copy}, it will affect the aspect ratio
491 stored at container level, but not the aspect ratio stored in encoded
492 frames, if it exists.
494 @item -vn (@emph{output})
495 Disable video recording.
497 @item -vcodec @var{codec} (@emph{output})
498 Set the video codec. This is an alias for @code{-codec:v}.
500 @item -pass[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
501 Select the pass number (1 or 2). It is used to do two-pass
502 video encoding. The statistics of the video are recorded in the first
503 pass into a log file (see also the option -passlogfile),
504 and in the second pass that log file is used to generate the video
505 at the exact requested bitrate.
506 On pass 1, you may just deactivate audio and set output to null,
507 examples for Windows and Unix:
509 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
510 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
513 @item -passlogfile[:@var{stream_specifier}] @var{prefix} (@emph{output,per-stream})
514 Set two-pass log file name prefix to @var{prefix}, the default file name
515 prefix is ``ffmpeg2pass''. The complete file name will be
516 @file{PREFIX-N.log}, where N is a number specific to the output
519 @item -vf @var{filtergraph} (@emph{output})
520 Create the filtergraph specified by @var{filtergraph} and use it to
523 This is an alias for @code{-filter:v}, see the @ref{filter_option,,-filter option}.
526 @section Advanced Video Options
529 @item -pix_fmt[:@var{stream_specifier}] @var{format} (@emph{input/output,per-stream})
530 Set pixel format. Use @code{-pix_fmts} to show all the supported
532 If the selected pixel format can not be selected, ffmpeg will print a
533 warning and select the best pixel format supported by the encoder.
534 If @var{pix_fmt} is prefixed by a @code{+}, ffmpeg will exit with an error
535 if the requested pixel format can not be selected, and automatic conversions
536 inside filtergraphs are disabled.
537 If @var{pix_fmt} is a single @code{+}, ffmpeg selects the same pixel format
538 as the input (or graph output) and automatic conversions are disabled.
540 @item -sws_flags @var{flags} (@emph{input/output})
545 @item -rc_override[:@var{stream_specifier}] @var{override} (@emph{output,per-stream})
546 Rate control override for specific intervals, formatted as "int,int,int"
547 list separated with slashes. Two first values are the beginning and
548 end frame numbers, last one is quantizer to use if positive, or quality
552 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
553 Use this option if your input file is interlaced and you want
554 to keep the interlaced format for minimum losses.
555 The alternative is to deinterlace the input stream with
556 @option{-deinterlace}, but deinterlacing introduces losses.
558 Calculate PSNR of compressed frames.
560 Dump video coding statistics to @file{vstats_HHMMSS.log}.
561 @item -vstats_file @var{file}
562 Dump video coding statistics to @var{file}.
563 @item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
564 top=1/bottom=0/auto=-1 field first
565 @item -dc @var{precision}
567 @item -vtag @var{fourcc/tag} (@emph{output})
568 Force video tag/fourcc. This is an alias for @code{-tag:v}.
569 @item -qphist (@emph{global})
571 @item -vbsf @var{bitstream_filter}
574 @item -force_key_frames[:@var{stream_specifier}] @var{time}[,@var{time}...] (@emph{output,per-stream})
575 @item -force_key_frames[:@var{stream_specifier}] expr:@var{expr} (@emph{output,per-stream})
576 Force key frames at the specified timestamps, more precisely at the first
577 frames after each specified time.
579 If the argument is prefixed with @code{expr:}, the string @var{expr}
580 is interpreted like an expression and is evaluated for each frame. A
581 key frame is forced in case the evaluation is non-zero.
583 If one of the times is "@code{chapters}[@var{delta}]", it is expanded into
584 the time of the beginning of all chapters in the file, shifted by
585 @var{delta}, expressed as a time in seconds.
586 This option can be useful to ensure that a seek point is present at a
587 chapter mark or any other designated place in the output file.
589 For example, to insert a key frame at 5 minutes, plus key frames 0.1 second
590 before the beginning of every chapter:
592 -force_key_frames 0:05:00,chapters-0.1
595 The expression in @var{expr} can contain the following constants:
598 the number of current processed frame, starting from 0
600 the number of forced frames
602 the number of the previous forced frame, it is @code{NAN} when no
603 keyframe was forced yet
605 the time of the previous forced frame, it is @code{NAN} when no
606 keyframe was forced yet
608 the time of the current processed frame
611 For example to force a key frame every 5 seconds, you can specify:
613 -force_key_frames expr:gte(t,n_forced*5)
616 To force a key frame 5 seconds after the time of the last forced one,
617 starting from second 13:
619 -force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5))
622 Note that forcing too many keyframes is very harmful for the lookahead
623 algorithms of certain encoders: using fixed-GOP options or similar
624 would be more efficient.
626 @item -copyinkf[:@var{stream_specifier}] (@emph{output,per-stream})
627 When doing stream copy, copy also non-key frames found at the
630 @item -hwaccel[:@var{stream_specifier}] @var{hwaccel} (@emph{input,per-stream})
631 Use hardware acceleration to decode the matching stream(s). The allowed values
632 of @var{hwaccel} are:
635 Do not use any hardware acceleration (the default).
638 Automatically select the hardware acceleration method.
641 Use VDPAU (Video Decode and Presentation API for Unix) hardware acceleration.
644 This option has no effect if the selected hwaccel is not available or not
645 supported by the chosen decoder.
647 Note that most acceleration methods are intended for playback and will not be
648 faster than software decoding on modern CPUs. Additionally, @command{ffmpeg}
649 will usually need to copy the decoded frames from the GPU memory into the system
650 memory, resulting in further performance loss. This option is thus mainly
653 @item -hwaccel_device[:@var{stream_specifier}] @var{hwaccel_device} (@emph{input,per-stream})
654 Select a device to use for hardware acceleration.
656 This option only makes sense when the @option{-hwaccel} option is also
657 specified. Its exact meaning depends on the specific hardware acceleration
662 For VDPAU, this option specifies the X11 display/screen to use. If this option
663 is not specified, the value of the @var{DISPLAY} environment variable is used
667 @section Audio Options
670 @item -aframes @var{number} (@emph{output})
671 Set the number of audio frames to record. This is an alias for @code{-frames:a}.
672 @item -ar[:@var{stream_specifier}] @var{freq} (@emph{input/output,per-stream})
673 Set the audio sampling frequency. For output streams it is set by
674 default to the frequency of the corresponding input stream. For input
675 streams this option only makes sense for audio grabbing devices and raw
676 demuxers and is mapped to the corresponding demuxer options.
677 @item -aq @var{q} (@emph{output})
678 Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
679 @item -ac[:@var{stream_specifier}] @var{channels} (@emph{input/output,per-stream})
680 Set the number of audio channels. For output streams it is set by
681 default to the number of input audio channels. For input streams
682 this option only makes sense for audio grabbing devices and raw demuxers
683 and is mapped to the corresponding demuxer options.
684 @item -an (@emph{output})
685 Disable audio recording.
686 @item -acodec @var{codec} (@emph{input/output})
687 Set the audio codec. This is an alias for @code{-codec:a}.
688 @item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt} (@emph{output,per-stream})
689 Set the audio sample format. Use @code{-sample_fmts} to get a list
690 of supported sample formats.
692 @item -af @var{filtergraph} (@emph{output})
693 Create the filtergraph specified by @var{filtergraph} and use it to
696 This is an alias for @code{-filter:a}, see the @ref{filter_option,,-filter option}.
699 @section Advanced Audio options:
702 @item -atag @var{fourcc/tag} (@emph{output})
703 Force audio tag/fourcc. This is an alias for @code{-tag:a}.
704 @item -absf @var{bitstream_filter}
706 @item -guess_layout_max @var{channels} (@emph{input,per-stream})
707 If some input channel layout is not known, try to guess only if it
708 corresponds to at most the specified number of channels. For example, 2
709 tells to @command{ffmpeg} to recognize 1 channel as mono and 2 channels as
710 stereo but not 6 channels as 5.1. The default is to always try to guess. Use
711 0 to disable all guessing.
714 @section Subtitle options:
717 @item -scodec @var{codec} (@emph{input/output})
718 Set the subtitle codec. This is an alias for @code{-codec:s}.
719 @item -sn (@emph{output})
720 Disable subtitle recording.
721 @item -sbsf @var{bitstream_filter}
725 @section Advanced Subtitle options:
729 @item -fix_sub_duration
730 Fix subtitles durations. For each subtitle, wait for the next packet in the
731 same stream and adjust the duration of the first to avoid overlap. This is
732 necessary with some subtitles codecs, especially DVB subtitles, because the
733 duration in the original packet is only a rough estimate and the end is
734 actually marked by an empty subtitle frame. Failing to use this option when
735 necessary can result in exaggerated durations or muxing failures due to
736 non-monotonic timestamps.
738 Note that this option will delay the output of all data until the next
739 subtitle packet is decoded: it may increase memory consumption and latency a
742 @item -canvas_size @var{size}
743 Set the size of the canvas used to render subtitles.
747 @section Advanced options
750 @item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] | @var{[linklabel]} (@emph{output})
752 Designate one or more input streams as a source for the output file. Each input
753 stream is identified by the input file index @var{input_file_id} and
754 the input stream index @var{input_stream_id} within the input
755 file. Both indices start at 0. If specified,
756 @var{sync_file_id}:@var{stream_specifier} sets which input stream
757 is used as a presentation sync reference.
759 The first @code{-map} option on the command line specifies the
760 source for output stream 0, the second @code{-map} option specifies
761 the source for output stream 1, etc.
763 A @code{-} character before the stream identifier creates a "negative" mapping.
764 It disables matching streams from already created mappings.
766 An alternative @var{[linklabel]} form will map outputs from complex filter
767 graphs (see the @option{-filter_complex} option) to the output file.
768 @var{linklabel} must correspond to a defined output link label in the graph.
770 For example, to map ALL streams from the first input file to output
772 ffmpeg -i INPUT -map 0 output
775 For example, if you have two audio streams in the first input file,
776 these streams are identified by "0:0" and "0:1". You can use
777 @code{-map} to select which streams to place in an output file. For
780 ffmpeg -i INPUT -map 0:1 out.wav
782 will map the input stream in @file{INPUT} identified by "0:1" to
783 the (single) output stream in @file{out.wav}.
785 For example, to select the stream with index 2 from input file
786 @file{a.mov} (specified by the identifier "0:2"), and stream with
787 index 6 from input @file{b.mov} (specified by the identifier "1:6"),
788 and copy them to the output file @file{out.mov}:
790 ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
793 To select all video and the third audio stream from an input file:
795 ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
798 To map all the streams except the second audio, use negative mappings
800 ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
803 Note that using this option disables the default mappings for this output file.
805 @item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][:@var{output_file_id}.@var{stream_specifier}]
806 Map an audio channel from a given input to an output. If
807 @var{output_file_id}.@var{stream_specifier} is not set, the audio channel will
808 be mapped on all the audio streams.
810 Using "-1" instead of
811 @var{input_file_id}.@var{stream_specifier}.@var{channel_id} will map a muted
814 For example, assuming @var{INPUT} is a stereo audio file, you can switch the
815 two audio channels with the following command:
817 ffmpeg -i INPUT -map_channel 0.0.1 -map_channel 0.0.0 OUTPUT
820 If you want to mute the first channel and keep the second:
822 ffmpeg -i INPUT -map_channel -1 -map_channel 0.0.1 OUTPUT
825 The order of the "-map_channel" option specifies the order of the channels in
826 the output stream. The output channel layout is guessed from the number of
827 channels mapped (mono if one "-map_channel", stereo if two, etc.). Using "-ac"
828 in combination of "-map_channel" makes the channel gain levels to be updated if
829 input and output channel layouts don't match (for instance two "-map_channel"
830 options and "-ac 6").
832 You can also extract each channel of an input to specific outputs; the following
833 command extracts two channels of the @var{INPUT} audio stream (file 0, stream 0)
834 to the respective @var{OUTPUT_CH0} and @var{OUTPUT_CH1} outputs:
836 ffmpeg -i INPUT -map_channel 0.0.0 OUTPUT_CH0 -map_channel 0.0.1 OUTPUT_CH1
839 The following example splits the channels of a stereo input into two separate
840 streams, which are put into the same output file:
842 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
845 Note that currently each output stream can only contain channels from a single
846 input stream; you can't for example use "-map_channel" to pick multiple input
847 audio channels contained in different streams (from the same or different files)
848 and merge them into a single output stream. It is therefore not currently
849 possible, for example, to turn two separate mono streams into a single stereo
850 stream. However splitting a stereo stream into two single channel mono streams
853 If you need this feature, a possible workaround is to use the @emph{amerge}
854 filter. For example, if you need to merge a media (here @file{input.mkv}) with 2
855 mono audio streams into one single stereo channel audio stream (and keep the
856 video stream), you can use the following command:
858 ffmpeg -i input.mkv -filter_complex "[0:1] [0:2] amerge" -c:a pcm_s16le -c:v copy output.mkv
861 @item -map_metadata[:@var{metadata_spec_out}] @var{infile}[:@var{metadata_spec_in}] (@emph{output,per-metadata})
862 Set metadata information of the next output file from @var{infile}. Note that
863 those are file indices (zero-based), not filenames.
864 Optional @var{metadata_spec_in/out} parameters specify, which metadata to copy.
865 A metadata specifier can have the following forms:
868 global metadata, i.e. metadata that applies to the whole file
870 @item @var{s}[:@var{stream_spec}]
871 per-stream metadata. @var{stream_spec} is a stream specifier as described
872 in the @ref{Stream specifiers} chapter. In an input metadata specifier, the first
873 matching stream is copied from. In an output metadata specifier, all matching
874 streams are copied to.
876 @item @var{c}:@var{chapter_index}
877 per-chapter metadata. @var{chapter_index} is the zero-based chapter index.
879 @item @var{p}:@var{program_index}
880 per-program metadata. @var{program_index} is the zero-based program index.
882 If metadata specifier is omitted, it defaults to global.
884 By default, global metadata is copied from the first input file,
885 per-stream and per-chapter metadata is copied along with streams/chapters. These
886 default mappings are disabled by creating any mapping of the relevant type. A negative
887 file index can be used to create a dummy mapping that just disables automatic copying.
889 For example to copy metadata from the first stream of the input file to global metadata
892 ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
895 To do the reverse, i.e. copy global metadata to all audio streams:
897 ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
899 Note that simple @code{0} would work as well in this example, since global
900 metadata is assumed by default.
902 @item -map_chapters @var{input_file_index} (@emph{output})
903 Copy chapters from input file with index @var{input_file_index} to the next
904 output file. If no chapter mapping is specified, then chapters are copied from
905 the first input file with at least one chapter. Use a negative file index to
906 disable any chapter copying.
908 @item -benchmark (@emph{global})
909 Show benchmarking information at the end of an encode.
910 Shows CPU time used and maximum memory consumption.
911 Maximum memory consumption is not supported on all systems,
912 it will usually display as 0 if not supported.
913 @item -benchmark_all (@emph{global})
914 Show benchmarking information during the encode.
915 Shows CPU time used in various steps (audio/video encode/decode).
916 @item -timelimit @var{duration} (@emph{global})
917 Exit after ffmpeg has been running for @var{duration} seconds.
918 @item -dump (@emph{global})
919 Dump each input packet to stderr.
920 @item -hex (@emph{global})
921 When dumping packets, also dump the payload.
922 @item -re (@emph{input})
923 Read input at native frame rate. Mainly used to simulate a grab device.
924 or live input stream (e.g. when reading from a file). Should not be used
925 with actual grab devices or live input streams (where it can cause packet
927 By default @command{ffmpeg} attempts to read the input(s) as fast as possible.
928 This option will slow down the reading of the input(s) to the native frame rate
929 of the input(s). It is useful for real-time output (e.g. live streaming).
931 Loop over the input stream. Currently it works only for image
932 streams. This option is used for automatic FFserver testing.
933 This option is deprecated, use -loop 1.
934 @item -loop_output @var{number_of_times}
935 Repeatedly loop output for formats that support looping such as animated GIF
936 (0 will loop the output infinitely).
937 This option is deprecated, use -loop.
938 @item -vsync @var{parameter}
940 For compatibility reasons old values can be specified as numbers.
941 Newly added values will have to be specified as strings always.
945 Each frame is passed with its timestamp from the demuxer to the muxer.
947 Frames will be duplicated and dropped to achieve exactly the requested
950 Frames are passed through with their timestamp or dropped so as to
951 prevent 2 frames from having the same timestamp.
953 As passthrough but destroys all timestamps, making the muxer generate
954 fresh timestamps based on frame-rate.
956 Chooses between 1 and 2 depending on muxer capabilities. This is the
960 Note that the timestamps may be further modified by the muxer, after this.
961 For example, in the case that the format option @option{avoid_negative_ts}
964 With -map you can select from which stream the timestamps should be
965 taken. You can leave either video or audio unchanged and sync the
966 remaining stream(s) to the unchanged one.
968 @item -async @var{samples_per_second}
969 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
970 the parameter is the maximum samples per second by which the audio is changed.
971 -async 1 is a special case where only the start of the audio stream is corrected
972 without any later correction.
974 Note that the timestamps may be further modified by the muxer, after this.
975 For example, in the case that the format option @option{avoid_negative_ts}
978 This option has been deprecated. Use the @code{aresample} audio filter instead.
981 Do not process input timestamps, but keep their values without trying
982 to sanitize them. In particular, do not remove the initial start time
985 Note that, depending on the @option{vsync} option or on specific muxer
986 processing (e.g. in case the format option @option{avoid_negative_ts}
987 is enabled) the output timestamps may mismatch with the input
988 timestamps even when this option is selected.
990 @item -copytb @var{mode}
991 Specify how to set the encoder timebase when stream copying. @var{mode} is an
992 integer numeric value, and can assume one of the following values:
996 Use the demuxer timebase.
998 The time base is copied to the output encoder from the corresponding input
999 demuxer. This is sometimes required to avoid non monotonically increasing
1000 timestamps when copying video streams with variable frame rate.
1003 Use the decoder timebase.
1005 The time base is copied to the output encoder from the corresponding input
1009 Try to make the choice automatically, in order to generate a sane output.
1012 Default value is -1.
1014 @item -shortest (@emph{output})
1015 Finish encoding when the shortest input stream ends.
1016 @item -dts_delta_threshold
1017 Timestamp discontinuity delta threshold.
1018 @item -muxdelay @var{seconds} (@emph{input})
1019 Set the maximum demux-decode delay.
1020 @item -muxpreload @var{seconds} (@emph{input})
1021 Set the initial demux-decode delay.
1022 @item -streamid @var{output-stream-index}:@var{new-value} (@emph{output})
1023 Assign a new stream-id value to an output stream. This option should be
1024 specified prior to the output filename to which it applies.
1025 For the situation where multiple output files exist, a streamid
1026 may be reassigned to a different value.
1028 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
1029 an output mpegts file:
1031 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
1034 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
1035 Set bitstream filters for matching streams. @var{bitstream_filters} is
1036 a comma-separated list of bitstream filters. Use the @code{-bsfs} option
1037 to get the list of bitstream filters.
1039 ffmpeg -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264
1042 ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
1045 @item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{input/output,per-stream})
1046 Force a tag/fourcc for matching streams.
1048 @item -timecode @var{hh}:@var{mm}:@var{ss}SEP@var{ff}
1049 Specify Timecode for writing. @var{SEP} is ':' for non drop timecode and ';'
1052 ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
1055 @anchor{filter_complex_option}
1056 @item -filter_complex @var{filtergraph} (@emph{global})
1057 Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
1058 outputs. For simple graphs -- those with one input and one output of the same
1059 type -- see the @option{-filter} options. @var{filtergraph} is a description of
1060 the filtergraph, as described in the ``Filtergraph syntax'' section of the
1061 ffmpeg-filters manual.
1063 Input link labels must refer to input streams using the
1064 @code{[file_index:stream_specifier]} syntax (i.e. the same as @option{-map}
1065 uses). If @var{stream_specifier} matches multiple streams, the first one will be
1066 used. An unlabeled input will be connected to the first unused input stream of
1069 Output link labels are referred to with @option{-map}. Unlabeled outputs are
1070 added to the first output file.
1072 Note that with this option it is possible to use only lavfi sources without
1075 For example, to overlay an image over video
1077 ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
1080 Here @code{[0:v]} refers to the first video stream in the first input file,
1081 which is linked to the first (main) input of the overlay filter. Similarly the
1082 first video stream in the second input is linked to the second (overlay) input
1085 Assuming there is only one video stream in each input file, we can omit input
1086 labels, so the above is equivalent to
1088 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map
1092 Furthermore we can omit the output label and the single output from the filter
1093 graph will be added to the output file automatically, so we can simply write
1095 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
1098 To generate 5 seconds of pure red video using lavfi @code{color} source:
1100 ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
1103 @item -lavfi @var{filtergraph} (@emph{global})
1104 Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
1105 outputs. Equivalent to @option{-filter_complex}.
1107 @item -filter_complex_script @var{filename} (@emph{global})
1108 This option is similar to @option{-filter_complex}, the only difference is that
1109 its argument is the name of the file from which a complex filtergraph
1110 description is to be read.
1112 @item -accurate_seek (@emph{input})
1113 This option enables or disables accurate seeking in input files with the
1114 @option{-ss} option. It is enabled by default, so seeking is accurate when
1115 transcoding. Use @option{-noaccurate_seek} to disable it, which may be useful
1116 e.g. when copying some streams and transcoding the others.
1118 @item -override_ffserver (@emph{global})
1119 Overrides the input specifications from @command{ffserver}. Using this
1120 option you can map any input stream to @command{ffserver} and control
1121 many aspects of the encoding from @command{ffmpeg}. Without this
1122 option @command{ffmpeg} will transmit to @command{ffserver} what is
1123 requested by @command{ffserver}.
1125 The option is intended for cases where features are needed that cannot be
1126 specified to @command{ffserver} but can be to @command{ffmpeg}.
1130 As a special exception, you can use a bitmap subtitle stream as input: it
1131 will be converted into a video with the same size as the largest video in
1132 the file, or 720x576 if no video is present. Note that this is an
1133 experimental and temporary solution. It will be removed once libavfilter has
1134 proper support for subtitles.
1136 For example, to hardcode subtitles on top of a DVB-T recording stored in
1137 MPEG-TS format, delaying the subtitles by 1 second:
1139 ffmpeg -i input.ts -filter_complex \
1140 '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
1141 -sn -map '#0x2dc' output.mkv
1143 (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video,
1144 audio and subtitles streams; 0:0, 0:3 and 0:7 would have worked too)
1146 @section Preset files
1147 A preset file contains a sequence of @var{option}=@var{value} pairs,
1148 one for each line, specifying a sequence of options which would be
1149 awkward to specify on the command line. Lines starting with the hash
1150 ('#') character are ignored and are used to provide comments. Check
1151 the @file{presets} directory in the FFmpeg source tree for examples.
1153 Preset files are specified with the @code{vpre}, @code{apre},
1154 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
1155 filename of the preset instead of a preset name as input and can be
1156 used for any kind of codec. For the @code{vpre}, @code{apre}, and
1157 @code{spre} options, the options specified in a preset file are
1158 applied to the currently selected codec of the same type as the preset
1161 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
1162 preset options identifies the preset file to use according to the
1165 First ffmpeg searches for a file named @var{arg}.ffpreset in the
1166 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
1167 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
1168 or in a @file{ffpresets} folder along the executable on win32,
1169 in that order. For example, if the argument is @code{libvpx-1080p}, it will
1170 search for the file @file{libvpx-1080p.ffpreset}.
1172 If no such file is found, then ffmpeg will search for a file named
1173 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
1174 directories, where @var{codec_name} is the name of the codec to which
1175 the preset file options will be applied. For example, if you select
1176 the video codec with @code{-vcodec libvpx} and use @code{-vpre 1080p},
1177 then it will search for the file @file{libvpx-1080p.ffpreset}.
1185 For streaming at very low bitrates, use a low frame rate
1186 and a small GOP size. This is especially true for RealVideo where
1187 the Linux player does not seem to be very fast, so it can miss
1188 frames. An example is:
1191 ffmpeg -g 3 -r 3 -t 10 -b:v 50k -s qcif -f rv10 /tmp/b.rm
1195 The parameter 'q' which is displayed while encoding is the current
1196 quantizer. The value 1 indicates that a very good quality could
1197 be achieved. The value 31 indicates the worst quality. If q=31 appears
1198 too often, it means that the encoder cannot compress enough to meet
1199 your bitrate. You must either increase the bitrate, decrease the
1200 frame rate or decrease the frame size.
1203 If your computer is not fast enough, you can speed up the
1204 compression at the expense of the compression ratio. You can use
1205 '-me zero' to speed up motion estimation, and '-g 0' to disable
1206 motion estimation completely (you have only I-frames, which means it
1207 is about as good as JPEG compression).
1210 To have very low audio bitrates, reduce the sampling frequency
1211 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
1214 To have a constant quality (but a variable bitrate), use the option
1215 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
1222 @c man begin EXAMPLES
1224 @section Preset files
1226 A preset file contains a sequence of @var{option=value} pairs, one for
1227 each line, specifying a sequence of options which can be specified also on
1228 the command line. Lines starting with the hash ('#') character are ignored and
1229 are used to provide comments. Empty lines are also ignored. Check the
1230 @file{presets} directory in the FFmpeg source tree for examples.
1232 Preset files are specified with the @code{pre} option, this option takes a
1233 preset name as input. FFmpeg searches for a file named @var{preset_name}.avpreset in
1234 the directories @file{$AVCONV_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
1235 the data directory defined at configuration time (usually @file{$PREFIX/share/ffmpeg})
1236 in that order. For example, if the argument is @code{libx264-max}, it will
1237 search for the file @file{libx264-max.avpreset}.
1239 @section Video and Audio grabbing
1241 If you specify the input format and device then ffmpeg can grab video
1245 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
1248 Or with an ALSA audio source (mono input, card id 1) instead of OSS:
1250 ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg
1253 Note that you must activate the right video source and channel before
1254 launching ffmpeg with any TV viewer such as
1255 @uref{http://linux.bytesex.org/xawtv/, xawtv} by Gerd Knorr. You also
1256 have to set the audio recording levels correctly with a
1259 @section X11 grabbing
1261 Grab the X11 display with ffmpeg via
1264 ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg
1267 0.0 is display.screen number of your X11 server, same as
1268 the DISPLAY environment variable.
1271 ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg
1274 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
1275 variable. 10 is the x-offset and 20 the y-offset for the grabbing.
1277 @section Video and Audio file format conversion
1279 Any supported file format and protocol can serve as input to ffmpeg:
1284 You can use YUV files as input:
1287 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
1290 It will use the files:
1292 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
1293 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
1296 The Y files use twice the resolution of the U and V files. They are
1297 raw files, without header. They can be generated by all decent video
1298 decoders. You must specify the size of the image with the @option{-s} option
1299 if ffmpeg cannot guess it.
1302 You can input from a raw YUV420P file:
1305 ffmpeg -i /tmp/test.yuv /tmp/out.avi
1308 test.yuv is a file containing raw YUV planar data. Each frame is composed
1309 of the Y plane followed by the U and V planes at half vertical and
1310 horizontal resolution.
1313 You can output to a raw YUV420P file:
1316 ffmpeg -i mydivx.avi hugefile.yuv
1320 You can set several input files and output files:
1323 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
1326 Converts the audio file a.wav and the raw YUV video file a.yuv
1330 You can also do audio and video conversions at the same time:
1333 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
1336 Converts a.wav to MPEG audio at 22050 Hz sample rate.
1339 You can encode to several formats at the same time and define a
1340 mapping from input stream to output streams:
1343 ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2
1346 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
1347 file:index' specifies which input stream is used for each output
1348 stream, in the order of the definition of output streams.
1351 You can transcode decrypted VOBs:
1354 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
1357 This is a typical DVD ripping example; the input is a VOB file, the
1358 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
1359 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
1360 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
1361 input video. Furthermore, the audio stream is MP3-encoded so you need
1362 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
1363 The mapping is particularly useful for DVD transcoding
1364 to get the desired audio language.
1366 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
1369 You can extract images from a video, or create a video from many images:
1371 For extracting images from a video:
1373 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1376 This will extract one video frame per second from the video and will
1377 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1378 etc. Images will be rescaled to fit the new WxH values.
1380 If you want to extract just a limited number of frames, you can use the
1381 above command in combination with the -vframes or -t option, or in
1382 combination with -ss to start extracting from a certain point in time.
1384 For creating a video from many images:
1386 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1389 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1390 composed of three digits padded with zeroes to express the sequence
1391 number. It is the same syntax supported by the C printf function, but
1392 only formats accepting a normal integer are suitable.
1394 When importing an image sequence, -i also supports expanding
1395 shell-like wildcard patterns (globbing) internally, by selecting the
1396 image2-specific @code{-pattern_type glob} option.
1398 For example, for creating a video from filenames matching the glob pattern
1401 ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi
1405 You can put many streams of the same type in the output:
1408 ffmpeg -i test1.avi -i test2.avi -map 0:3 -map 0:2 -map 0:1 -map 0:0 -c copy test12.nut
1411 The resulting output file @file{test12.avi} will contain first four streams from
1412 the input file in reverse order.
1415 To force CBR video output:
1417 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
1421 The four options lmin, lmax, mblmin and mblmax use 'lambda' units,
1422 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
1424 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
1430 @include config.texi
1432 @ifset config-avutil
1435 @ifset config-avcodec
1436 @include codecs.texi
1437 @include bitstream_filters.texi
1439 @ifset config-avformat
1440 @include formats.texi
1441 @include protocols.texi
1443 @ifset config-avdevice
1444 @include devices.texi
1446 @ifset config-swresample
1447 @include resampler.texi
1449 @ifset config-swscale
1450 @include scaler.texi
1452 @ifset config-avfilter
1453 @include filters.texi
1461 @url{ffmpeg.html,ffmpeg}
1463 @ifset config-not-all
1464 @url{ffmpeg-all.html,ffmpeg-all},
1466 @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe}, @url{ffserver.html,ffserver},
1467 @url{ffmpeg-utils.html,ffmpeg-utils},
1468 @url{ffmpeg-scaler.html,ffmpeg-scaler},
1469 @url{ffmpeg-resampler.html,ffmpeg-resampler},
1470 @url{ffmpeg-codecs.html,ffmpeg-codecs},
1471 @url{ffmpeg-bitstream-filters.html,ffmpeg-bitstream-filters},
1472 @url{ffmpeg-formats.html,ffmpeg-formats},
1473 @url{ffmpeg-devices.html,ffmpeg-devices},
1474 @url{ffmpeg-protocols.html,ffmpeg-protocols},
1475 @url{ffmpeg-filters.html,ffmpeg-filters}
1482 @ifset config-not-all
1485 ffplay(1), ffprobe(1), ffserver(1),
1486 ffmpeg-utils(1), ffmpeg-scaler(1), ffmpeg-resampler(1),
1487 ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
1488 ffmpeg-devices(1), ffmpeg-protocols(1), ffmpeg-filters(1)
1491 @include authors.texi
1496 @settitle ffmpeg video converter