[FFmpeg-devel] [PATCH] doc/filters: add overlay daisy-chaining example

Stefano Sabatini stefasab at gmail.com
Sat Dec 15 15:38:22 CET 2012

 doc/filters.texi |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index fecb629..44654fe 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3132,8 +3132,8 @@ 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
@@ -3182,6 +3182,18 @@ The above command is the same as:
 ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
 @end example
+ at item
+Chain several overlays in cascade:
+ at 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=b=0, [mid0] overlay=100:0   [mid1];
+[in2] lutrgb=g=0, [mid1] overlay=0:100   [mid2];
+[in3] null,       [mid2] overlay=100:100 [out0]"
+ at end example
 @end itemize
 @section pad

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