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diff --git a/doc/filters.texi b/doc/filters.texi index f14cf6b557..def2751ba7 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -8413,6 +8413,32 @@ will send a reply to the client, adopting the format: @var{MESSAGE} is optional. +@subsection Examples + +Look at @file{tools/zmqsend} for an example of a zmq client which can +be used to send commands processed by these filters. + +Consider the following filtergraph generated by @command{ffplay} +@example +ffplay -dumpgraph 1 -f lavfi " +color=s=100x100:c=red [l]; +color=s=100x100:c=blue [r]; +nullsrc=s=200x100, zmq [bg]; +[bg][l] overlay [bg+l]; +[bg+l][r] overlay=x=100 " +@end example + +To change the color of the left side of the video, the following +command can be used: +@example +echo Parsed_color_0 c yellow | tools/zmqsend +@end example + +To change the right side: +@example +echo Parsed_color_1 c pink | tools/zmqsend +@end example + @c man end MULTIMEDIA FILTERS @chapter Multimedia Sources |