@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 filename of each file to read must contain a sequential number,
which specifies the position of the file in the sequence.

The pattern must contain the string "%d" or "%0@var{N}d", which
specifies the position of the characters representing the seqential
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 "%%".

The first filename of the file sequence specified by the pattern must
contain a number inclusively contained between 0 and 4, all the
following numbers must be sequential.

The pattern may contain a suffix which is used to automatically
determine the format of the images contained in the files.

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.

The size, the pixel format, and the format of each image must be the
same for all the files in the sequence.

The following example shows how to use @file{ffmpeg} for creating a
video from the images in the file sequence @file{img-001.jpeg},
@file{img-002.jpeg}, ..., assuming an input framerate of 10 frames per
second:
@example
ffmpeg -r 10 -f image2 -i 'img-%03d.jpeg' out.avi
@end example

@c man end INPUT DEVICES
