A picture frame declaring a negative width or height.
The sibling of InvalidSampleCount on the picture road, and found
by auditing for it: width and height were floored with .max(0)
before anything judged them, so a declared -1 became 0 and then
sailed through the pixel ceiling (zero pixels is under every
ceiling) to produce a real VideoFrame of zero extent. A refusal
delivered as a successful decode, which is the one outcome worse
than an error.
Zero itself is not refused here: it is what an unset dimension
reads as, the ceilings and the plane geometry both handle it, and
inventing a refusal for it would be policy this audit has no
evidence for. Only the negative — which cannot be a dimension under
any reading — is named.