Question / Help Any way to delay XComposite Capture?

I'm using a navigator screen to generate a chroma key overlay for a video source. Unfortunately , due to camera transmission delays, data from navigator screen (overlay) comes faster than matching camera video. I can apply a delay filter to video source, but don't know if possible with xcomposite capture

You can see an example with one of my videos at:
https://www.youtube.com/watch?v=B1mRxj8Y8no

( you can see an overlay with competitor data and chronometer information starting before the runner starts :-)


Any ideas?
Thanks in advance

Juan Antonio
 
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