public static OffsetBuffer<byte> YuvToRgb24(
	int width,
	int height,
	int stride,
	byte* y,
	byte* u,
	byte* v
)

Visual Basic does not support APIs that consume or return unsafe types.

public:
static OffsetBuffer<unsigned char>^ YuvToRgb24(
	int width, 
	int height, 
	int stride, 
	unsigned char* y, 
	unsigned char* u, 
	unsigned char* v
)

F# does not support APIs that consume or return unsafe types.