The way I do the upload is pretty simple, I convert the avframe to a
packed YUV444 buffer. This can be done really fast, then I upload this
texture using GL_RGB. I use a pixelshader to convert the YUV data to
RGB. This last part can also be done by using the default matrix
operations which can be set before uploading. Personally I think the
shader variant is faster, although I have no data to support this
Depending on your drivers it can be faster to convert the avframe to a
YUV444 format with a dummy alpha channel, and then uploading it as an
GL_BGRA texture.
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