In FFV1 specification, I read: > plane_count prior to version 4: without transparency: 2 else 3. > version 4 and later: gray: 1, gray+alpha or color:2, color+alpha:3
but in both headers (FrameHeader01 or GlobalHeader), I see chroma_planes flag, it looks like all versions of FFV1 bitstream are supporting gray (and gray+alpha). Does it make sense to consider this difference between "prior to version 4" and "version 4 and later" as applicable to the FFmpeg encoder/decoder, not the FFV1 bistream specification itself?
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