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Add scale filter.

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Originally committed as revision 20519 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2009-11-11 23:50:21 +00:00
parent ba11257e48
commit c3eabb7d2f
5 changed files with 231 additions and 1 deletions
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doc/libavfilter.texi
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@ -164,6 +164,31 @@ not specified it will use the default value of 16.
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
@section scale
Scale the input video to width:height and/or convert the image format.
For example the command:
@example
./ffmpeg -i in.avi -vfilters "scale=200:100" out.avi
@end example
will scale the input video to a size of 200x100.
If the input image format is different from the format requested by
the next filter, the scale filter will convert the input to the
requested format.
If the value for ``width'' or ``height'' is 0, the respective input
size is used for the output.
If the value for ``width'' or ``height'' is -1, the scale filter will
use, for the respective output size, a value that maintains the aspect
ratio of the input image.
The default value of ``width'' and ``height'' is 0.
@section vflip
Flip the input video vertically.