mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.5 KiB
67 lines
2.5 KiB
@chapter Demuxers |
|
@c man begin DEMUXERS |
|
|
|
Demuxers are configured elements in Libav which allow to read the |
|
multimedia streams from a particular type of file. |
|
|
|
When you configure your Libav 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 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 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 0 and 4, all the following numbers must |
|
be sequential. This limitation may be hopefully fixed. |
|
|
|
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 |
|
|
|
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 -f image2 -i img.jpeg img.png |
|
@end example |
|
|
|
@c man end INPUT DEVICES
|
|
|