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doc/filters: add overlay daisy-chaining example

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Stefano Sabatini 2012-12-15 15:36:30 +01:00
parent 35b97ad7c0
commit 0824aa6743
1 changed files with 14 additions and 2 deletions
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doc/filters.texi
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@ -3214,8 +3214,8 @@ to pass the two inputs through a @var{setpts=PTS-STARTPTS} filter to
have them begin in the same zero timestamp, as it does the example for
the @var{movie} filter.
You can chain together more overlays but the efficiency of such
approach is yet to be tested.
You can chain together more overlays but you should test the
efficiency of such approach.
@subsection Examples
@ -3264,6 +3264,18 @@ The above command is the same as:
@example
ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
@end example
@item
Chain several overlays in cascade:
@example
nullsrc=s=200x200 [bg];
testsrc=s=100x100, split=4 [in0][in1][in2][in3];
[in0] lutrgb=r=0, [bg] overlay=0:0 [mid0];
[in1] lutrgb=g=0, [mid0] overlay=100:0 [mid1];
[in2] lutrgb=b=0, [mid1] overlay=0:100 [mid2];
[in3] null, [mid2] overlay=100:100 [out0]
@end example
@end itemize
@section pad