avfilter: add maskedmerge filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 0fdb677124..a5906d6ccb 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -7625,6 +7625,25 @@ lutyuv=y='bitand(val, 128+64+32)'
 @end example
 @end itemize
 
+@section maskedmerge
+
+Merge the first input stream with the second input stream using per pixel
+weights in the third input stream.
+
+A value of 0 in the third stream pixel component means that pixel component
+from first stream is returned unchanged, while maximum value (eg. 255 for
+8-bit videos) means that pixel component from second stream is returned
+unchanged. Intermediate values define the amount of merging between both
+input stream's pixel components.
+
+This filter accepts the following options:
+@table @option
+@item planes
+Set which planes will be processed as bitmap, unprocessed planes will be
+copied from first stream.
+By default value 0xf, all planes will be processed.
+@end table
+
 @section mergeplanes
 
 Merge color channel components from several video streams.