Hi,

> ffprobe now reports out.mov being yuv420p. Is this an implicit conversion to 
> a lower bit depth?

It's just the default output format for overlay. It's commonly used for stuff 
across colorspaces (like yuv420p video and argb png logos overlaid) especially 
with alpha.

You can set format option in the filter itself to force output format. I assume 
it doesn't do any conversions when you overlay two sources with same format 
with no alpha internally.

Regards,
Ted Park

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