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 Apple HTTP Live Streaming demuxer.
25 This demuxer presents all AVStreams from all variant streams.
26 The id field is set to the bitrate variant index number. By setting
27 the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
28 the caller can decide which variant streams to actually receive.
29 The total bitrate of the variant that the stream belongs to is
30 available in a metadata key named "variant_bitrate".
34 Advanced Systems Format demuxer.
36 This demuxer is used to demux ASF files and MMS network streams.
39 @item -no_resync_search @var{bool}
40 Do not try to resynchronize by looking for a certain optional start code.
46 Virtual concatenation script demuxer.
48 This demuxer reads a list of files and other directives from a text file and
49 demuxes them one after the other, as if all their packet had been muxed
52 The timestamps in the files are adjusted so that the first file starts at 0
53 and each next file starts where the previous one finishes. Note that it is
54 done globally and may cause gaps if all streams do not have exactly the same
57 All files must have the same streams (same codecs, same time base, etc.).
59 The duration of each file is used to adjust the timestamps of the next file:
60 if the duration is incorrect (because it was computed using the bit-rate or
61 because the file is truncated, for example), it can cause artifacts. The
62 @code{duration} directive can be used to override the duration stored in
67 The script is a text file in extended-ASCII, with one directive per line.
68 Empty lines, leading spaces and lines starting with '#' are ignored. The
69 following directive is recognized:
73 @item @code{file @var{path}}
74 Path to a file to read; special characters and spaces must be escaped with
75 backslash or single quotes.
77 All subsequent directives apply to that file.
79 @item @code{ffconcat version 1.0}
80 Identify the script type and version. It also sets the @option{safe} option
81 to 1 if it was to its default -1.
83 To make FFmpeg recognize the format automatically, this directive must
84 appears exactly as is (no extra space or byte-order-mark) on the very first
87 @item @code{duration @var{dur}}
88 Duration of the file. This information can be specified from the file;
89 specifying it here may be more efficient or help if the information from the
90 file is not available or accurate.
92 If the duration is set for all files, then it is possible to seek in the
93 whole concatenated video.
99 This demuxer accepts the following option:
104 If set to 1, reject unsafe file paths. A file path is considered safe if it
105 does not contain a protocol specification and is relative and all components
106 only contain characters from the portable character set (letters, digits,
107 period, underscore and hyphen) and have no period at the beginning of a
110 If set to 0, any file name is accepted.
112 The default is -1, it is equivalent to 1 if the format was automatically
113 probed and 0 otherwise.
119 Adobe Flash Video Format demuxer.
121 This demuxer is used to demux FLV files and RTMP network streams.
124 @item -flv_metadata @var{bool}
125 Allocate the streams according to the onMetaData array content.
130 The Game Music Emu library is a collection of video game music file emulators.
132 See @url{http://code.google.com/p/game-music-emu/} for more information.
134 Some files have multiple tracks. The demuxer will pick the first track by
135 default. The @option{track_index} option can be used to select a different
136 track. Track indexes start at 0. The demuxer exports the number of tracks as
137 @var{tracks} meta data entry.
139 For very large files, the @option{max_size} option may have to be adjusted.
143 Play media from Internet services using the quvi project.
145 The demuxer accepts a @option{format} option to request a specific quality. It
146 is by default set to @var{best}.
148 See @url{http://quvi.sourceforge.net/} for more information.
150 FFmpeg needs to be built with @code{--enable-libquvi} for this demuxer to be
157 This demuxer reads from a list of image files specified by a pattern.
158 The syntax and meaning of the pattern is specified by the
159 option @var{pattern_type}.
161 The pattern may contain a suffix which is used to automatically
162 determine the format of the images contained in the files.
164 The size, the pixel format, and the format of each image must be the
165 same for all the files in the sequence.
167 This demuxer accepts the following options:
170 Set the frame rate for the video stream. It defaults to 25.
172 If set to 1, loop over the input. Default value is 0.
174 Select the pattern type used to interpret the provided filename.
176 @var{pattern_type} accepts one of the following values.
179 Select a sequence pattern type, used to specify a sequence of files
180 indexed by sequential numbers.
182 A sequence pattern may contain the string "%d" or "%0@var{N}d", which
183 specifies the position of the characters representing a sequential
184 number in each filename matched by the pattern. If the form
185 "%d0@var{N}d" is used, the string representing the number in each
186 filename is 0-padded and @var{N} is the total number of 0-padded
187 digits representing the number. The literal character '%' can be
188 specified in the pattern with the string "%%".
190 If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
191 the file list specified by the pattern must contain a number
192 inclusively contained between @var{start_number} and
193 @var{start_number}+@var{start_number_range}-1, and all the following
194 numbers must be sequential.
196 For example the pattern "img-%03d.bmp" will match a sequence of
197 filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
198 @file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
199 sequence of filenames of the form @file{i%m%g-1.jpg},
200 @file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
202 Note that the pattern must not necessarily contain "%d" or
203 "%0@var{N}d", for example to convert a single image file
204 @file{img.jpeg} you can employ the command:
206 ffmpeg -i img.jpeg img.png
210 Select a glob wildcard pattern type.
212 The pattern is interpreted like a @code{glob()} pattern. This is only
213 selectable if libavformat was compiled with globbing support.
215 @item glob_sequence @emph{(deprecated, will be removed)}
216 Select a mixed glob wildcard/sequence pattern.
218 If your version of libavformat was compiled with globbing support, and
219 the provided pattern contains at least one glob meta character among
220 @code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
221 interpreted like a @code{glob()} pattern, otherwise it is interpreted
222 like a sequence pattern.
224 All glob special characters @code{%*?[]@{@}} must be prefixed
225 with "%". To escape a literal "%" you shall use "%%".
227 For example the pattern @code{foo-%*.jpeg} will match all the
228 filenames prefixed by "foo-" and terminating with ".jpeg", and
229 @code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
230 "foo-", followed by a sequence of three characters, and terminating
233 This pattern type is deprecated in favor of @var{glob} and
237 Default value is @var{glob_sequence}.
239 Set the pixel format of the images to read. If not specified the pixel
240 format is guessed from the first image file in the sequence.
242 Set the index of the file matched by the image file pattern to start
243 to read from. Default value is 0.
244 @item start_number_range
245 Set the index interval range to check when looking for the first image
246 file in the sequence, starting from @var{start_number}. Default value
249 If set to 1, will set frame timestamp to modification time of image file. Note
250 that monotonity of timestamps is not provided: images go in the same order as
251 without this option. Default value is 0.
253 Set the video size of the images to read. If not specified the video
254 size is guessed from the first image file in the sequence.
261 Use @command{ffmpeg} for creating a video from the images in the file
262 sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
263 input frame rate of 10 frames per second:
265 ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
269 As above, but start by reading from a file with index 100 in the sequence:
271 ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
275 Read images matching the "*.png" glob pattern , that is all the files
276 terminating with the ".png" suffix:
278 ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
284 MPEG-2 transport stream demuxer.
288 @item fix_teletext_pts
289 Overrides teletext packet PTS and DTS values with the timestamps calculated
290 from the PCR of the first program which the teletext stream is part of and is
291 not discarded. Default value is 1, set this option to 0 if you want your
292 teletext packet PTS and DTS values untouched.
299 This demuxer allows to read raw video data. Since there is no header
300 specifying the assumed video parameters, the user must specify them
301 in order to be able to decode the data correctly.
303 This demuxer accepts the following options:
307 Set input video frame rate. Default value is 25.
310 Set the input video pixel format. Default value is @code{yuv420p}.
313 Set the input video size. This value must be specified explicitly.
316 For example to read a rawvideo file @file{input.raw} with
317 @command{ffplay}, assuming a pixel format of @code{rgb24}, a video
318 size of @code{320x240}, and a frame rate of 10 images per second, use
321 ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
326 SBaGen script demuxer.
328 This demuxer reads the script language used by SBaGen
329 @url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
330 script looks like that:
333 a: 300-2.5/3 440+4.5/0
334 b: 300-2.5/0 440+4.5/3
343 A SBG script can mix absolute and relative timestamps. If the script uses
344 either only absolute timestamps (including the script start time) or only
345 relative ones, then its layout is fixed, and the conversion is
346 straightforward. On the other hand, if the script mixes both kind of
347 timestamps, then the @var{NOW} reference for relative timestamps will be
348 taken from the current time of day at the time the script is read, and the
349 script layout will be frozen according to that reference. That means that if
350 the script is directly played, the actual times will match the absolute
351 timestamps up to the sound controller's clock accuracy, but if the user
352 somehow pauses the playback or seeks, all times will be shifted accordingly.
356 JSON captions used for @url{http://www.ted.com/, TED Talks}.
358 TED does not provide links to the captions, but they can be guessed from the
359 page. The file @file{tools/bookmarklets.html} from the FFmpeg source tree
360 contains a bookmarklet to expose them.
362 This demuxer accepts the following option:
365 Set the start time of the TED talk, in milliseconds. The default is 15000
366 (15s). It is used to sync the captions with the downloadable videos, because
367 they include a 15s intro.
370 Example: convert the captions to a format most players understand:
372 ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt