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3a06ea8436
Allow to override the default 'glob_sequence' value, which is deprecated in favor of the new 'glob' and 'sequence' options. The new pattern types should be easier on the user since they are more predictable than 'glob_sequence', and do not require awkward escaping.
188 lines
6.6 KiB
Plaintext
188 lines
6.6 KiB
Plaintext
@chapter Demuxers
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@c man begin DEMUXERS
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Demuxers are configured elements in FFmpeg which allow to read the
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multimedia streams from a particular type of file.
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When you configure your FFmpeg build, all the supported demuxers
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are enabled by default. You can list all available ones using the
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configure option "--list-demuxers".
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You can disable all the demuxers using the configure option
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"--disable-demuxers", and selectively enable a single demuxer with
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the option "--enable-demuxer=@var{DEMUXER}", or disable it
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with the option "--disable-demuxer=@var{DEMUXER}".
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The option "-formats" of the ff* tools will display the list of
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enabled demuxers.
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The description of some of the currently available demuxers follows.
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@section image2
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Image file demuxer.
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This demuxer reads from a list of image files specified by a pattern.
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The syntax and meaning of the pattern is specified by the
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option @var{pattern_type}.
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The pattern may contain a suffix which is used to automatically
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determine the format of the images contained in the files.
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The size, the pixel format, and the format of each image must be the
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same for all the files in the sequence.
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This demuxer accepts the following options:
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@table @option
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@item framerate
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Set the framerate for the video stream. It defaults to 25.
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@item loop
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If set to 1, loop over the input. Default value is 0.
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@item pattern_type
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Select the pattern type used to interpret the provided filename.
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@var{pattern_type} accepts one of the following values.
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@table @option
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@item sequence
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Select a sequence pattern type, used to specify a sequence of files
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indexed by sequential numbers.
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A sequence pattern may contain the string "%d" or "%0@var{N}d", which
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specifies the position of the characters representing a sequential
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number in each filename matched by the pattern. If the form
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"%d0@var{N}d" is used, the string representing the number in each
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filename is 0-padded and @var{N} is the total number of 0-padded
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digits representing the number. The literal character '%' can be
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specified in the pattern with the string "%%".
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If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
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the file list specified by the pattern must contain a number
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inclusively contained between @var{start_number} and
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@var{start_number}+@var{start_number_range}-1, and all the following
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numbers must be sequential.
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For example the pattern "img-%03d.bmp" will match a sequence of
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filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
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@file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
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sequence of filenames of the form @file{i%m%g-1.jpg},
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@file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
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Note that the pattern must not necessarily contain "%d" or
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"%0@var{N}d", for example to convert a single image file
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@file{img.jpeg} you can employ the command:
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@example
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ffmpeg -i img.jpeg img.png
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@end example
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@item glob
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Select a glob wildcard pattern type.
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The pattern is interpreted like a @code{glob()} pattern. This is only
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selectable if libavformat was compiled with globbing support.
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@item glob_sequence @emph{(deprecated, will be removed)}
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Select a mixed glob wildcard/sequence pattern.
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If your version of libavformat was compiled with globbing support, and
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the provided pattern contains at least one glob meta character among
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@code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
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interpreted like a @code{glob()} pattern, otherwise it is interpreted
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like a sequence pattern.
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All glob special characters @code{%*?[]@{@}} must be prefixed
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with "%". To escape a literal "%" you shall use "%%".
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For example the pattern @code{foo-%*.jpeg} will match all the
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filenames prefixed by "foo-" and terminating with ".jpeg", and
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@code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
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"foo-", followed by a sequence of three characters, and terminating
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with ".jpeg".
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This pattern type is deprecated in favor of @var{glob} and
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@var{sequence}.
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@end table
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Default value is @var{glob_sequence}.
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@item pixel_format
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Set the pixel format of the images to read. If not specified the pixel
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format is guessed from the first image file in the sequence.
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@item start_number
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Set the index of the file matched by the image file pattern to start
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to read from. Default value is 0.
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@item start_number_range
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Set the index interval range to check when looking for the first image
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file in the sequence, starting from @var{start_number}. Default value
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is 5.
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@item video_size
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Set the video size of the images to read. If not specified the video
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size is guessed from the first image file in the sequence.
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@end table
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@subsection Examples
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@itemize
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@item
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Use @command{ffmpeg} for creating a video from the images in the file
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sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
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input frame rate of 10 frames per second:
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@example
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ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
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@end example
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@item
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As above, but start by reading from a file with index 100 in the sequence:
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@example
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ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv
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@end example
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@item
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Read images matching the "*.png" glob pattern , that is all the files
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terminating with the ".png" suffix:
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@example
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ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv
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@end example
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@end itemize
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@section applehttp
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Apple HTTP Live Streaming demuxer.
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This demuxer presents all AVStreams from all variant streams.
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The id field is set to the bitrate variant index number. By setting
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the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
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the caller can decide which variant streams to actually receive.
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The total bitrate of the variant that the stream belongs to is
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available in a metadata key named "variant_bitrate".
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@section sbg
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SBaGen script demuxer.
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This demuxer reads the script language used by SBaGen
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@url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
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script looks like that:
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@example
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-SE
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a: 300-2.5/3 440+4.5/0
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b: 300-2.5/0 440+4.5/3
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off: -
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NOW == a
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+0:07:00 == b
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+0:14:00 == a
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+0:21:00 == b
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+0:30:00 off
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@end example
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A SBG script can mix absolute and relative timestamps. If the script uses
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either only absolute timestamps (including the script start time) or only
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relative ones, then its layout is fixed, and the conversion is
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straightforward. On the other hand, if the script mixes both kind of
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timestamps, then the @var{NOW} reference for relative timestamps will be
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taken from the current time of day at the time the script is read, and the
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script layout will be frozen according to that reference. That means that if
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the script is directly played, the actual times will match the absolute
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timestamps up to the sound controller's clock accuracy, but if the user
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somehow pauses the playback or seeks, all times will be shifted accordingly.
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@c man end INPUT DEVICES
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