[FFmpeg-user] multiple inputs into a single frame

[Roger Pack]

> [Parsed_overlay_7 @ 0x3542a40] Overlay area (204,16)<->(924,592) not within the main area (0,0)<->(128,128) or zero-sized
> [auto-inserted scaler 0 @ 0x3544d80] Failed to configure input pad on Parsed_overlay_7
> Error opening filters!

appears you can only overlay "directly over the top" of another movie.
 Though I wish this could be made optional :)