4 Demuxers are configured elements in FFmpeg which allow to 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 Virtual concatenation script demuxer.
36 This demuxer reads a list of files and other directives from a text file and
37 demuxes them one after the other, as if all their packet had been muxed
40 The timestamps in the files are adjusted so that the first file starts at 0
41 and each next file starts where the previous one finishes. Note that it is
42 done globally and may cause gaps if all streams do not have exactly the same
45 All files must have the same streams (same codecs, same time base, etc.).
47 This script format can currently not be probed, it must be specified explicitly.
51 The script is a text file in extended-ASCII, with one directive per line.
52 Empty lines, leading spaces and lines starting with '#' are ignored. The
53 following directive is recognized:
57 @item @code{file @var{path}}
58 Path to a file to read; special characters and spaces must be escaped with
59 backslash or single quotes.
65 This demuxer accepts the following option:
70 If set to 1, reject unsafe file paths. A file path is considered safe if it
71 does not contain a protocol specification and is relative and all components
72 only contain characters from the portable character set (letters, digits,
73 period, underscore and hyphen) and have no period at the beginning of a
76 If set to 0, any file name is accepted.
78 The default is -1, it is equivalent to 1 if the format was automatically
79 probed and 0 otherwise.
87 This demuxer reads from a list of image files specified by a pattern.
88 The syntax and meaning of the pattern is specified by the
89 option @var{pattern_type}.
91 The pattern may contain a suffix which is used to automatically
92 determine the format of the images contained in the files.
94 The size, the pixel format, and the format of each image must be the
95 same for all the files in the sequence.
97 This demuxer accepts the following options:
100 Set the framerate for the video stream. It defaults to 25.
102 If set to 1, loop over the input. Default value is 0.
104 Select the pattern type used to interpret the provided filename.
106 @var{pattern_type} accepts one of the following values.
109 Select a sequence pattern type, used to specify a sequence of files
110 indexed by sequential numbers.
112 A sequence pattern may contain the string "%d" or "%0@var{N}d", which
113 specifies the position of the characters representing a sequential
114 number in each filename matched by the pattern. If the form
115 "%d0@var{N}d" is used, the string representing the number in each
116 filename is 0-padded and @var{N} is the total number of 0-padded
117 digits representing the number. The literal character '%' can be
118 specified in the pattern with the string "%%".
120 If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
121 the file list specified by the pattern must contain a number
122 inclusively contained between @var{start_number} and
123 @var{start_number}+@var{start_number_range}-1, and all the following
124 numbers must be sequential.
126 For example the pattern "img-%03d.bmp" will match a sequence of
127 filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
128 @file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
129 sequence of filenames of the form @file{i%m%g-1.jpg},
130 @file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
132 Note that the pattern must not necessarily contain "%d" or
133 "%0@var{N}d", for example to convert a single image file
134 @file{img.jpeg} you can employ the command:
136 ffmpeg -i img.jpeg img.png
140 Select a glob wildcard pattern type.
142 The pattern is interpreted like a @code{glob()} pattern. This is only
143 selectable if libavformat was compiled with globbing support.
145 @item glob_sequence @emph{(deprecated, will be removed)}
146 Select a mixed glob wildcard/sequence pattern.
148 If your version of libavformat was compiled with globbing support, and
149 the provided pattern contains at least one glob meta character among
150 @code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
151 interpreted like a @code{glob()} pattern, otherwise it is interpreted
152 like a sequence pattern.
154 All glob special characters @code{%*?[]@{@}} must be prefixed
155 with "%". To escape a literal "%" you shall use "%%".
157 For example the pattern @code{foo-%*.jpeg} will match all the
158 filenames prefixed by "foo-" and terminating with ".jpeg", and
159 @code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
160 "foo-", followed by a sequence of three characters, and terminating
163 This pattern type is deprecated in favor of @var{glob} and
167 Default value is @var{glob_sequence}.
169 Set the pixel format of the images to read. If not specified the pixel
170 format is guessed from the first image file in the sequence.
172 Set the index of the file matched by the image file pattern to start
173 to read from. Default value is 0.
174 @item start_number_range
175 Set the index interval range to check when looking for the first image
176 file in the sequence, starting from @var{start_number}. Default value
179 Set the video size of the images to read. If not specified the video
180 size is guessed from the first image file in the sequence.
187 Use @command{ffmpeg} for creating a video from the images in the file
188 sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
189 input frame rate of 10 frames per second:
191 ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
195 As above, but start by reading from a file with index 100 in the sequence:
197 ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv
201 Read images matching the "*.png" glob pattern , that is all the files
202 terminating with the ".png" suffix:
204 ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv
212 This demuxer allows to read raw video data. Since there is no header
213 specifying the assumed video parameters, the user must specify them
214 in order to be able to decode the data correctly.
216 This demuxer accepts the following options:
220 Set input video frame rate. Default value is 25.
223 Set the input video pixel format. Default value is @code{yuv420p}.
226 Set the input video size. This value must be specified explicitly.
229 For example to read a rawvideo file @file{input.raw} with
230 @command{ffplay}, assuming a pixel format of @code{rgb24}, a video
231 size of @code{320x240}, and a frame rate of 10 images per second, use
234 ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
239 SBaGen script demuxer.
241 This demuxer reads the script language used by SBaGen
242 @url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
243 script looks like that:
246 a: 300-2.5/3 440+4.5/0
247 b: 300-2.5/0 440+4.5/3
256 A SBG script can mix absolute and relative timestamps. If the script uses
257 either only absolute timestamps (including the script start time) or only
258 relative ones, then its layout is fixed, and the conversion is
259 straightforward. On the other hand, if the script mixes both kind of
260 timestamps, then the @var{NOW} reference for relative timestamps will be
261 taken from the current time of day at the time the script is read, and the
262 script layout will be frozen according to that reference. That means that if
263 the script is directly played, the actual times will match the absolute
264 timestamps up to the sound controller's clock accuracy, but if the user
265 somehow pauses the playback or seeks, all times will be shifted accordingly.
269 JSON captions used for @url{http://www.ted.com/, TED Talks}.
271 TED does not provide links to the captions, but they can be guessed from the
272 page. The file @file{tools/bookmarklets.html} from the FFmpeg source tree
273 contains a bookmarklet to expose them.
275 This demuxer accepts the following option:
278 Set the start time of the TED talk, in milliseconds. The default is 15000
279 (15s). It is used to sync the captions with the downloadable videos, because
280 they include a 15s intro.
283 Example: convert the captions to a format most players understand:
285 ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt