AVPixFmtDescriptor.log2_chroma_w

Amount to shift the luma width right to find the chroma width. For YV12 this is 1 for example. chroma_width = AV_CEIL_RSHIFT(luma_width, log2_chroma_w) The note above is needed to ensure rounding up. This value only refers to the chroma components.

struct AVPixFmtDescriptor
ubyte log2_chroma_w;

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