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

[Stefano Sabatini]

ffmpeg | branch: master | Stefano Sabatini <stefasab at gmail.com> | Sat Dec 15 15:36:30 2012 +0100| [0824aa67436d4c90fb71330d97ba4a20b44ddedb] | committer: Stefano Sabatini

doc/filters: add overlay daisy-chaining example

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0824aa67436d4c90fb71330d97ba4a20b44ddedb
---

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

diff --git a/doc/filters.texi b/doc/filters.texi
index 259a5e5..ac5eece 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -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
+
+ 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=g=0, [mid0] overlay=100:0   [mid1];
+[in2] lutrgb=b=0, [mid1] overlay=0:100   [mid2];
+[in3] null,       [mid2] overlay=100:100 [out0]
+ at end example
+
 @end itemize
 
 @section pad