@Sinan @bryanb @marios @allklier thanks for looking at this issue btw!
One quick test you could do - replace input1 on the Mastergrade with a color source. Guaranteed to provide picture to Mastergrade. Render that. If it still happens, it’s a bug in Mastergrade. If it works fine, then there’s something wrong upstream that breaks the feed.
Could very well be that you have a single frame that is broken upstream. That may be harder to find in the UI as you don’t always hit each frame. But the render will absolutely find it.
same issue happens with a colour source instead of media. looks like its a bug then.
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