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".
35 Virtual concatenation script demuxer.
37 This demuxer reads a list of files and other directives from a text file and
38 demuxes them one after the other, as if all their packet had been muxed
41 The timestamps in the files are adjusted so that the first file starts at 0
42 and each next file starts where the previous one finishes. Note that it is
43 done globally and may cause gaps if all streams do not have exactly the same
46 All files must have the same streams (same codecs, same time base, etc.).
48 The duration of each file is used to adjust the timestamps of the next file:
49 if the duration is incorrect (because it was computed using the bit-rate or
50 because the file is truncated, for example), it can cause artifacts. The
51 @code{duration} directive can be used to override the duration stored in
56 The script is a text file in extended-ASCII, with one directive per line.
57 Empty lines, leading spaces and lines starting with '#' are ignored. The
58 following directive is recognized:
62 @item @code{file @var{path}}
63 Path to a file to read; special characters and spaces must be escaped with
64 backslash or single quotes.
66 All subsequent directives apply to that file.
68 @item @code{ffconcat version 1.0}
69 Identify the script type and version. It also sets the @option{safe} option
70 to 1 if it was to its default -1.
72 To make FFmpeg recognize the format automatically, this directive must
73 appears exactly as is (no extra space or byte-order-mark) on the very first
76 @item @code{duration @var{dur}}
77 Duration of the file. This information can be specified from the file;
78 specifying it here may be more efficient or help if the information from the
79 file is not available or accurate.
81 If the duration is set for all files, then it is possible to seek in the
82 whole concatenated video.
88 This demuxer accepts the following option:
93 If set to 1, reject unsafe file paths. A file path is considered safe if it
94 does not contain a protocol specification and is relative and all components
95 only contain characters from the portable character set (letters, digits,
96 period, underscore and hyphen) and have no period at the beginning of a
99 If set to 0, any file name is accepted.
101 The default is -1, it is equivalent to 1 if the format was automatically
102 probed and 0 otherwise.
110 This demuxer reads from a list of image files specified by a pattern.
111 The syntax and meaning of the pattern is specified by the
112 option @var{pattern_type}.
114 The pattern may contain a suffix which is used to automatically
115 determine the format of the images contained in the files.
117 The size, the pixel format, and the format of each image must be the
118 same for all the files in the sequence.
120 This demuxer accepts the following options:
123 Set the frame rate for the video stream. It defaults to 25.
125 If set to 1, loop over the input. Default value is 0.
127 Select the pattern type used to interpret the provided filename.
129 @var{pattern_type} accepts one of the following values.
132 Select a sequence pattern type, used to specify a sequence of files
133 indexed by sequential numbers.
135 A sequence pattern may contain the string "%d" or "%0@var{N}d", which
136 specifies the position of the characters representing a sequential
137 number in each filename matched by the pattern. If the form
138 "%d0@var{N}d" is used, the string representing the number in each
139 filename is 0-padded and @var{N} is the total number of 0-padded
140 digits representing the number. The literal character '%' can be
141 specified in the pattern with the string "%%".
143 If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
144 the file list specified by the pattern must contain a number
145 inclusively contained between @var{start_number} and
146 @var{start_number}+@var{start_number_range}-1, and all the following
147 numbers must be sequential.
149 For example the pattern "img-%03d.bmp" will match a sequence of
150 filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
151 @file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
152 sequence of filenames of the form @file{i%m%g-1.jpg},
153 @file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
155 Note that the pattern must not necessarily contain "%d" or
156 "%0@var{N}d", for example to convert a single image file
157 @file{img.jpeg} you can employ the command:
159 ffmpeg -i img.jpeg img.png
163 Select a glob wildcard pattern type.
165 The pattern is interpreted like a @code{glob()} pattern. This is only
166 selectable if libavformat was compiled with globbing support.
168 @item glob_sequence @emph{(deprecated, will be removed)}
169 Select a mixed glob wildcard/sequence pattern.
171 If your version of libavformat was compiled with globbing support, and
172 the provided pattern contains at least one glob meta character among
173 @code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
174 interpreted like a @code{glob()} pattern, otherwise it is interpreted
175 like a sequence pattern.
177 All glob special characters @code{%*?[]@{@}} must be prefixed
178 with "%". To escape a literal "%" you shall use "%%".
180 For example the pattern @code{foo-%*.jpeg} will match all the
181 filenames prefixed by "foo-" and terminating with ".jpeg", and
182 @code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
183 "foo-", followed by a sequence of three characters, and terminating
186 This pattern type is deprecated in favor of @var{glob} and
190 Default value is @var{glob_sequence}.
192 Set the pixel format of the images to read. If not specified the pixel
193 format is guessed from the first image file in the sequence.
195 Set the index of the file matched by the image file pattern to start
196 to read from. Default value is 0.
197 @item start_number_range
198 Set the index interval range to check when looking for the first image
199 file in the sequence, starting from @var{start_number}. Default value
202 Set the video size of the images to read. If not specified the video
203 size is guessed from the first image file in the sequence.
210 Use @command{ffmpeg} for creating a video from the images in the file
211 sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
212 input frame rate of 10 frames per second:
214 ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
218 As above, but start by reading from a file with index 100 in the sequence:
220 ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv
224 Read images matching the "*.png" glob pattern , that is all the files
225 terminating with the ".png" suffix:
227 ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv
235 This demuxer allows to read raw video data. Since there is no header
236 specifying the assumed video parameters, the user must specify them
237 in order to be able to decode the data correctly.
239 This demuxer accepts the following options:
243 Set input video frame rate. Default value is 25.
246 Set the input video pixel format. Default value is @code{yuv420p}.
249 Set the input video size. This value must be specified explicitly.
252 For example to read a rawvideo file @file{input.raw} with
253 @command{ffplay}, assuming a pixel format of @code{rgb24}, a video
254 size of @code{320x240}, and a frame rate of 10 images per second, use
257 ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
262 SBaGen script demuxer.
264 This demuxer reads the script language used by SBaGen
265 @url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
266 script looks like that:
269 a: 300-2.5/3 440+4.5/0
270 b: 300-2.5/0 440+4.5/3
279 A SBG script can mix absolute and relative timestamps. If the script uses
280 either only absolute timestamps (including the script start time) or only
281 relative ones, then its layout is fixed, and the conversion is
282 straightforward. On the other hand, if the script mixes both kind of
283 timestamps, then the @var{NOW} reference for relative timestamps will be
284 taken from the current time of day at the time the script is read, and the
285 script layout will be frozen according to that reference. That means that if
286 the script is directly played, the actual times will match the absolute
287 timestamps up to the sound controller's clock accuracy, but if the user
288 somehow pauses the playback or seeks, all times will be shifted accordingly.
292 JSON captions used for @url{http://www.ted.com/, TED Talks}.
294 TED does not provide links to the captions, but they can be guessed from the
295 page. The file @file{tools/bookmarklets.html} from the FFmpeg source tree
296 contains a bookmarklet to expose them.
298 This demuxer accepts the following option:
301 Set the start time of the TED talk, in milliseconds. The default is 15000
302 (15s). It is used to sync the captions with the downloadable videos, because
303 they include a 15s intro.
306 Example: convert the captions to a format most players understand:
308 ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt