Examples


Look at '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 ffplay. In this example the last overlay filter has an instance name. All other filters will have default instance names. 

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@my=x=100 "

To change the color of the left side of the video, the following command can be used: 

echo Parsed_color_0 c yellow | tools/zmqsend

To change the right side: 

echo Parsed_color_1 c pink | tools/zmqsend

To change the position of the right side: 

echo overlay@my x 150 | tools/zmqsend

Below is a description of the currently available multimedia sources.