AV_PIX_FMT_YUV444P10

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) @nogc nothrow
enum AV_PIX_FMT_YUV444P10 = AVPixelFormat.AV_PIX_FMT_YUV444P10LE;

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