[FFmpeg-user] Exclude a region of screen with black detect

[tangential]

I've got a set of videos with a logo in the lower right corner and some gaps
where that is all that is on the screen. I'm trying to identify those gaps
and eliminate them from the videos in a more automated manner.

I'm using black detect with various thresholds (px_th and pic_th) and either
it finds nothing or it yields a lot of false positives and I think it is
because of the logo. I'd like to look for a pretty much black frame but
eliminate a pixel range (something like 0,600 to 640,720)

Is that possible with ffmpeg?

Failing that, can I give it a frame to match and locate those?





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