Thanks, I've got it working, Rick, but I just find it all a bit clunky. I noticed the video
did not progress on (the silly little) HP Pav computer as it was casting, but that's
nothing, as it caught up when stopped/finished. I will persevere.

I'm wondering why the Ccast key itself gets hot after a while in the HDMI port. It's
powered from its own mains power supply, rather than from a nearby USB port.