mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
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
|
|
@c man begin DEMUXERS
|
|
|
|
Demuxers are configured elements in FFmpeg which allow to read the
|
|
multimedia streams from a particular type of file.
|
|
|
|
When you configure your FFmpeg build, all the supported demuxers
|
|
are enabled by default. You can list all available ones using the
|
|
configure option "--list-demuxers".
|
|
|
|
You can disable all the demuxers using the configure option
|
|
"--disable-demuxers", and selectively enable a single demuxer with
|
|
the option "--enable-demuxer=@var{DEMUXER}", or disable it
|
|
with the option "--disable-demuxer=@var{DEMUXER}".
|
|
|
|
The option "-formats" of the ff* tools will display the list of
|
|
enabled demuxers.
|
|
|
|
The description of some of the currently available demuxers follows.
|
|
|
|
@section image2
|
|
|
|
Image file demuxer.
|
|
|
|
This demuxer reads from a list of image files specified by a pattern.
|
|
The syntax and meaning of the pattern is specified by the
|
|
option @var{pattern_type}.
|
|
|
|
The pattern may contain a suffix which is used to automatically
|
|
determine the format of the images contained in the files.
|
|
|
|
The size, the pixel format, and the format of each image must be the
|
|
same for all the files in the sequence.
|
|
|
|
This demuxer accepts the following options:
|
|
@table @option
|
|
@item framerate
|
|
Set the framerate for the video stream. It defaults to 25.
|
|
@item loop
|
|
If set to 1, loop over the input. Default value is 0.
|
|
@item pattern_type
|
|
Select the pattern type used to interpret the provided filename.
|
|
|
|
@var{pattern_type} accepts one of the following values.
|
|
@table @option
|
|
@item sequence
|
|
Select a sequence pattern type, used to specify a sequence of files
|
|
indexed by sequential numbers.
|
|
|
|
A sequence pattern may contain the string "%d" or "%0@var{N}d", which
|
|
specifies the position of the characters representing a sequential
|
|
number in each filename matched by the pattern. If the form
|
|
"%d0@var{N}d" is used, the string representing the number in each
|
|
filename is 0-padded and @var{N} is the total number of 0-padded
|
|
digits representing the number. The literal character '%' can be
|
|
specified in the pattern with the string "%%".
|
|
|
|
If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
|
|
the file list specified by the pattern must contain a number
|
|
inclusively contained between @var{start_number} and
|
|
@var{start_number}+@var{start_number_range}-1, and all the following
|
|
numbers must be sequential.
|
|
|
|
For example the pattern "img-%03d.bmp" will match a sequence of
|
|
filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
|
|
@file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
|
|
sequence of filenames of the form @file{i%m%g-1.jpg},
|
|
@file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
|
|
|
|
Note that the pattern must not necessarily contain "%d" or
|
|
"%0@var{N}d", for example to convert a single image file
|
|
@file{img.jpeg} you can employ the command:
|
|
@example
|
|
ffmpeg -i img.jpeg img.png
|
|
@end example
|
|
|
|
@item glob
|
|
Select a glob wildcard pattern type.
|
|
|
|
The pattern is interpreted like a @code{glob()} pattern. This is only
|
|
selectable if libavformat was compiled with globbing support.
|
|
|
|
@item glob_sequence @emph{(deprecated, will be removed)}
|
|
Select a mixed glob wildcard/sequence pattern.
|
|
|
|
If your version of libavformat was compiled with globbing support, and
|
|
the provided pattern contains at least one glob meta character among
|
|
@code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
|
|
interpreted like a @code{glob()} pattern, otherwise it is interpreted
|
|
like a sequence pattern.
|
|
|
|
All glob special characters @code{%*?[]@{@}} must be prefixed
|
|
with "%". To escape a literal "%" you shall use "%%".
|
|
|
|
For example the pattern @code{foo-%*.jpeg} will match all the
|
|
filenames prefixed by "foo-" and terminating with ".jpeg", and
|
|
@code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
|
|
"foo-", followed by a sequence of three characters, and terminating
|
|
with ".jpeg".
|
|
|
|
This pattern type is deprecated in favor of @var{glob} and
|
|
@var{sequence}.
|
|
@end table
|
|
|
|
Default value is @var{glob_sequence}.
|
|
@item pixel_format
|
|
Set the pixel format of the images to read. If not specified the pixel
|
|
format is guessed from the first image file in the sequence.
|
|
@item start_number
|
|
Set the index of the file matched by the image file pattern to start
|
|
to read from. Default value is 0.
|
|
@item start_number_range
|
|
Set the index interval range to check when looking for the first image
|
|
file in the sequence, starting from @var{start_number}. Default value
|
|
is 5.
|
|
@item video_size
|
|
Set the video size of the images to read. If not specified the video
|
|
size is guessed from the first image file in the sequence.
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
@item
|
|
Use @command{ffmpeg} for creating a video from the images in the file
|
|
sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
|
|
input frame rate of 10 frames per second:
|
|
@example
|
|
ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
|
|
@end example
|
|
|
|
@item
|
|
As above, but start by reading from a file with index 100 in the sequence:
|
|
@example
|
|
ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv
|
|
@end example
|
|
|
|
@item
|
|
Read images matching the "*.png" glob pattern , that is all the files
|
|
terminating with the ".png" suffix:
|
|
@example
|
|
ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv
|
|
@end example
|
|
@end itemize
|
|
|
|
@section applehttp
|
|
|
|
Apple HTTP Live Streaming demuxer.
|
|
|
|
This demuxer presents all AVStreams from all variant streams.
|
|
The id field is set to the bitrate variant index number. By setting
|
|
the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
|
|
the caller can decide which variant streams to actually receive.
|
|
The total bitrate of the variant that the stream belongs to is
|
|
available in a metadata key named "variant_bitrate".
|
|
|
|
@section sbg
|
|
|
|
SBaGen script demuxer.
|
|
|
|
This demuxer reads the script language used by SBaGen
|
|
@url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
|
|
script looks like that:
|
|
@example
|
|
-SE
|
|
a: 300-2.5/3 440+4.5/0
|
|
b: 300-2.5/0 440+4.5/3
|
|
off: -
|
|
NOW == a
|
|
+0:07:00 == b
|
|
+0:14:00 == a
|
|
+0:21:00 == b
|
|
+0:30:00 off
|
|
@end example
|
|
|
|
A SBG script can mix absolute and relative timestamps. If the script uses
|
|
either only absolute timestamps (including the script start time) or only
|
|
relative ones, then its layout is fixed, and the conversion is
|
|
straightforward. On the other hand, if the script mixes both kind of
|
|
timestamps, then the @var{NOW} reference for relative timestamps will be
|
|
taken from the current time of day at the time the script is read, and the
|
|
script layout will be frozen according to that reference. That means that if
|
|
the script is directly played, the actual times will match the absolute
|
|
timestamps up to the sound controller's clock accuracy, but if the user
|
|
somehow pauses the playback or seeks, all times will be shifted accordingly.
|
|
|
|
@c man end INPUT DEVICES
|