4 Demuxers are configured elements in FFmpeg that can read the
5 multimedia streams from a particular type of file.
7 When you configure your FFmpeg build, all the supported demuxers
8 are enabled by default. You can list all available ones using the
9 configure option @code{--list-demuxers}.
11 You can disable all the demuxers using the configure option
12 @code{--disable-demuxers}, and selectively enable a single demuxer with
13 the option @code{--enable-demuxer=@var{DEMUXER}}, or disable it
14 with the option @code{--disable-demuxer=@var{DEMUXER}}.
16 The option @code{-formats} of the ff* tools will display the list of
19 The description of some of the currently available demuxers follows.
23 Audible Format 2, 3, and 4 demuxer.
25 This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
29 Apple HTTP Live Streaming demuxer.
31 This demuxer presents all AVStreams from all variant streams.
32 The id field is set to the bitrate variant index number. By setting
33 the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
34 the caller can decide which variant streams to actually receive.
35 The total bitrate of the variant that the stream belongs to is
36 available in a metadata key named "variant_bitrate".
40 Animated Portable Network Graphics demuxer.
42 This demuxer is used to demux APNG files.
43 All headers, but the PNG signature, up to (but not including) the first
44 fcTL chunk are transmitted as extradata.
45 Frames are then split as being all the chunks between two fcTL ones, or
46 between the last fcTL and IEND chunks.
49 @item -ignore_loop @var{bool}
50 Ignore the loop variable in the file if set.
51 @item -max_fps @var{int}
52 Maximum framerate in frames per second (0 for no limit).
53 @item -default_fps @var{int}
54 Default framerate in frames per second when none is specified in the file
55 (0 meaning as fast as possible).
60 Advanced Systems Format demuxer.
62 This demuxer is used to demux ASF files and MMS network streams.
65 @item -no_resync_search @var{bool}
66 Do not try to resynchronize by looking for a certain optional start code.
72 Virtual concatenation script demuxer.
74 This demuxer reads a list of files and other directives from a text file and
75 demuxes them one after the other, as if all their packet had been muxed
78 The timestamps in the files are adjusted so that the first file starts at 0
79 and each next file starts where the previous one finishes. Note that it is
80 done globally and may cause gaps if all streams do not have exactly the same
83 All files must have the same streams (same codecs, same time base, etc.).
85 The duration of each file is used to adjust the timestamps of the next file:
86 if the duration is incorrect (because it was computed using the bit-rate or
87 because the file is truncated, for example), it can cause artifacts. The
88 @code{duration} directive can be used to override the duration stored in
93 The script is a text file in extended-ASCII, with one directive per line.
94 Empty lines, leading spaces and lines starting with '#' are ignored. The
95 following directive is recognized:
99 @item @code{file @var{path}}
100 Path to a file to read; special characters and spaces must be escaped with
101 backslash or single quotes.
103 All subsequent file-related directives apply to that file.
105 @item @code{ffconcat version 1.0}
106 Identify the script type and version. It also sets the @option{safe} option
107 to 1 if it was to its default -1.
109 To make FFmpeg recognize the format automatically, this directive must
110 appears exactly as is (no extra space or byte-order-mark) on the very first
113 @item @code{duration @var{dur}}
114 Duration of the file. This information can be specified from the file;
115 specifying it here may be more efficient or help if the information from the
116 file is not available or accurate.
118 If the duration is set for all files, then it is possible to seek in the
119 whole concatenated video.
121 @item @code{inpoint @var{timestamp}}
122 In point of the file. When the demuxer opens the file it instantly seeks to the
123 specified timestamp. Seeking is done so that all streams can be presented
124 successfully at In point.
126 This directive works best with intra frame codecs, because for non-intra frame
127 ones you will usually get extra packets before the actual In point and the
128 decoded content will most likely contain frames before In point too.
130 For each file, packets before the file In point will have timestamps less than
131 the calculated start timestamp of the file (negative in case of the first
132 file), and the duration of the files (if not specified by the @code{duration}
133 directive) will be reduced based on their specified In point.
135 Because of potential packets before the specified In point, packet timestamps
136 may overlap between two concatenated files.
138 @item @code{outpoint @var{timestamp}}
139 Out point of the file. When the demuxer reaches the specified decoding
140 timestamp in any of the streams, it handles it as an end of file condition and
141 skips the current and all the remaining packets from all streams.
143 Out point is exclusive, which means that the demuxer will not output packets
144 with a decoding timestamp greater or equal to Out point.
146 This directive works best with intra frame codecs and formats where all streams
147 are tightly interleaved. For non-intra frame codecs you will usually get
148 additional packets with presentation timestamp after Out point therefore the
149 decoded content will most likely contain frames after Out point too. If your
150 streams are not tightly interleaved you may not get all the packets from all
151 streams before Out point and you may only will be able to decode the earliest
152 stream until Out point.
154 The duration of the files (if not specified by the @code{duration}
155 directive) will be reduced based on their specified Out point.
157 @item @code{file_packet_metadata @var{key=value}}
158 Metadata of the packets of the file. The specified metadata will be set for
159 each file packet. You can specify this directive multiple times to add multiple
163 Introduce a stream in the virtual file.
164 All subsequent stream-related directives apply to the last introduced
166 Some streams properties must be set in order to allow identifying the
167 matching streams in the subfiles.
168 If no streams are defined in the script, the streams from the first file are
171 @item @code{exact_stream_id @var{id}}
172 Set the id of the stream.
173 If this directive is given, the string with the corresponding id in the
174 subfiles will be used.
175 This is especially useful for MPEG-PS (VOB) files, where the order of the
176 streams is not reliable.
182 This demuxer accepts the following option:
187 If set to 1, reject unsafe file paths. A file path is considered safe if it
188 does not contain a protocol specification and is relative and all components
189 only contain characters from the portable character set (letters, digits,
190 period, underscore and hyphen) and have no period at the beginning of a
193 If set to 0, any file name is accepted.
195 The default is -1, it is equivalent to 1 if the format was automatically
196 probed and 0 otherwise.
199 If set to 1, try to perform automatic conversions on packet data to make the
200 streams concatenable.
203 Currently, the only conversion is adding the h264_mp4toannexb bitstream
204 filter to H.264 streams in MP4 format. This is necessary in particular if
205 there are resolution changes.
207 @item segment_time_metadata
208 If set to 1, every packet will contain the @var{lavf.concat.start_time} and the
209 @var{lavf.concat.duration} packet metadata values which are the start_time and
210 the duration of the respective file segments in the concatenated output
211 expressed in microseconds. The duration metadata is only set if it is known
212 based on the concat file.
219 Adobe Flash Video Format demuxer.
221 This demuxer is used to demux FLV files and RTMP network streams.
224 @item -flv_metadata @var{bool}
225 Allocate the streams according to the onMetaData array content.
230 The Game Music Emu library is a collection of video game music file emulators.
232 See @url{http://code.google.com/p/game-music-emu/} for more information.
234 Some files have multiple tracks. The demuxer will pick the first track by
235 default. The @option{track_index} option can be used to select a different
236 track. Track indexes start at 0. The demuxer exports the number of tracks as
237 @var{tracks} meta data entry.
239 For very large files, the @option{max_size} option may have to be adjusted.
243 Play media from Internet services using the quvi project.
245 The demuxer accepts a @option{format} option to request a specific quality. It
246 is by default set to @var{best}.
248 See @url{http://quvi.sourceforge.net/} for more information.
250 FFmpeg needs to be built with @code{--enable-libquvi} for this demuxer to be
255 Animated GIF demuxer.
257 It accepts the following options:
261 Set the minimum valid delay between frames in hundredths of seconds.
262 Range is 0 to 6000. Default value is 2.
265 Set the maximum valid delay between frames in hundredth of seconds.
266 Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
267 the maximum value allowed by the specification.
270 Set the default delay between frames in hundredths of seconds.
271 Range is 0 to 6000. Default value is 10.
274 GIF files can contain information to loop a certain number of times (or
275 infinitely). If @option{ignore_loop} is set to 1, then the loop setting
276 from the input will be ignored and looping will not occur. If set to 0,
277 then looping will occur and will cycle the number of times according to
278 the GIF. Default value is 1.
281 For example, with the overlay filter, place an infinitely looping GIF
284 ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
287 Note that in the above example the shortest option for overlay filter is
288 used to end the output video at the length of the shortest input file,
289 which in this case is @file{input.mp4} as the GIF in this example loops
296 This demuxer reads from a list of image files specified by a pattern.
297 The syntax and meaning of the pattern is specified by the
298 option @var{pattern_type}.
300 The pattern may contain a suffix which is used to automatically
301 determine the format of the images contained in the files.
303 The size, the pixel format, and the format of each image must be the
304 same for all the files in the sequence.
306 This demuxer accepts the following options:
309 Set the frame rate for the video stream. It defaults to 25.
311 If set to 1, loop over the input. Default value is 0.
313 Select the pattern type used to interpret the provided filename.
315 @var{pattern_type} accepts one of the following values.
318 Disable pattern matching, therefore the video will only contain the specified
319 image. You should use this option if you do not want to create sequences from
320 multiple images and your filenames may contain special pattern characters.
322 Select a sequence pattern type, used to specify a sequence of files
323 indexed by sequential numbers.
325 A sequence pattern may contain the string "%d" or "%0@var{N}d", which
326 specifies the position of the characters representing a sequential
327 number in each filename matched by the pattern. If the form
328 "%d0@var{N}d" is used, the string representing the number in each
329 filename is 0-padded and @var{N} is the total number of 0-padded
330 digits representing the number. The literal character '%' can be
331 specified in the pattern with the string "%%".
333 If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
334 the file list specified by the pattern must contain a number
335 inclusively contained between @var{start_number} and
336 @var{start_number}+@var{start_number_range}-1, and all the following
337 numbers must be sequential.
339 For example the pattern "img-%03d.bmp" will match a sequence of
340 filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
341 @file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
342 sequence of filenames of the form @file{i%m%g-1.jpg},
343 @file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
345 Note that the pattern must not necessarily contain "%d" or
346 "%0@var{N}d", for example to convert a single image file
347 @file{img.jpeg} you can employ the command:
349 ffmpeg -i img.jpeg img.png
353 Select a glob wildcard pattern type.
355 The pattern is interpreted like a @code{glob()} pattern. This is only
356 selectable if libavformat was compiled with globbing support.
358 @item glob_sequence @emph{(deprecated, will be removed)}
359 Select a mixed glob wildcard/sequence pattern.
361 If your version of libavformat was compiled with globbing support, and
362 the provided pattern contains at least one glob meta character among
363 @code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
364 interpreted like a @code{glob()} pattern, otherwise it is interpreted
365 like a sequence pattern.
367 All glob special characters @code{%*?[]@{@}} must be prefixed
368 with "%". To escape a literal "%" you shall use "%%".
370 For example the pattern @code{foo-%*.jpeg} will match all the
371 filenames prefixed by "foo-" and terminating with ".jpeg", and
372 @code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
373 "foo-", followed by a sequence of three characters, and terminating
376 This pattern type is deprecated in favor of @var{glob} and
380 Default value is @var{glob_sequence}.
382 Set the pixel format of the images to read. If not specified the pixel
383 format is guessed from the first image file in the sequence.
385 Set the index of the file matched by the image file pattern to start
386 to read from. Default value is 0.
387 @item start_number_range
388 Set the index interval range to check when looking for the first image
389 file in the sequence, starting from @var{start_number}. Default value
392 If set to 1, will set frame timestamp to modification time of image file. Note
393 that monotonity of timestamps is not provided: images go in the same order as
394 without this option. Default value is 0.
395 If set to 2, will set frame timestamp to the modification time of the image file in
396 nanosecond precision.
398 Set the video size of the images to read. If not specified the video
399 size is guessed from the first image file in the sequence.
406 Use @command{ffmpeg} for creating a video from the images in the file
407 sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
408 input frame rate of 10 frames per second:
410 ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
414 As above, but start by reading from a file with index 100 in the sequence:
416 ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
420 Read images matching the "*.png" glob pattern , that is all the files
421 terminating with the ".png" suffix:
423 ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
429 MPEG-2 transport stream demuxer.
431 This demuxer accepts the following options:
434 Set size limit for looking up a new synchronization. Default value is
437 @item fix_teletext_pts
438 Override teletext packet PTS and DTS values with the timestamps calculated
439 from the PCR of the first program which the teletext stream is part of and is
440 not discarded. Default value is 1, set this option to 0 if you want your
441 teletext packet PTS and DTS values untouched.
444 Output option carrying the raw packet size in bytes.
445 Show the detected raw packet size, cannot be set by the user.
448 Scan and combine all PMTs. The value is an integer with value from -1
449 to 1 (-1 means automatic setting, 1 means enabled, 0 means
450 disabled). Default value is -1.
455 MJPEG encapsulated in multi-part MIME demuxer.
457 This demuxer allows reading of MJPEG, where each frame is represented as a part of
458 multipart/x-mixed-replace stream.
461 @item strict_mime_boundary
462 Default implementation applies a relaxed standard to multi-part MIME boundary detection,
463 to prevent regression with numerous existing endpoints not generating a proper MIME
464 MJPEG stream. Turning this option on by setting it to 1 will result in a stricter check
465 of the boundary value.
472 This demuxer allows one to read raw video data. Since there is no header
473 specifying the assumed video parameters, the user must specify them
474 in order to be able to decode the data correctly.
476 This demuxer accepts the following options:
480 Set input video frame rate. Default value is 25.
483 Set the input video pixel format. Default value is @code{yuv420p}.
486 Set the input video size. This value must be specified explicitly.
489 For example to read a rawvideo file @file{input.raw} with
490 @command{ffplay}, assuming a pixel format of @code{rgb24}, a video
491 size of @code{320x240}, and a frame rate of 10 images per second, use
494 ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
499 SBaGen script demuxer.
501 This demuxer reads the script language used by SBaGen
502 @url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
503 script looks like that:
506 a: 300-2.5/3 440+4.5/0
507 b: 300-2.5/0 440+4.5/3
516 A SBG script can mix absolute and relative timestamps. If the script uses
517 either only absolute timestamps (including the script start time) or only
518 relative ones, then its layout is fixed, and the conversion is
519 straightforward. On the other hand, if the script mixes both kind of
520 timestamps, then the @var{NOW} reference for relative timestamps will be
521 taken from the current time of day at the time the script is read, and the
522 script layout will be frozen according to that reference. That means that if
523 the script is directly played, the actual times will match the absolute
524 timestamps up to the sound controller's clock accuracy, but if the user
525 somehow pauses the playback or seeks, all times will be shifted accordingly.
529 JSON captions used for @url{http://www.ted.com/, TED Talks}.
531 TED does not provide links to the captions, but they can be guessed from the
532 page. The file @file{tools/bookmarklets.html} from the FFmpeg source tree
533 contains a bookmarklet to expose them.
535 This demuxer accepts the following option:
538 Set the start time of the TED talk, in milliseconds. The default is 15000
539 (15s). It is used to sync the captions with the downloadable videos, because
540 they include a 15s intro.
543 Example: convert the captions to a format most players understand:
545 ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt