I think I know what he means (and I think I misunderstood him in my previous comment). With acceleration, he means "render speedup by not converting color space", which is what he introduced with #845. @elupus: Yes, I disable your render speedup because none of the two DXVA renderers currently available can render anything else than YV12-8bit, resulting in in a black screen on attempted Hi10P playback. This is more of a workaround right now - the proper fix would be to completely overhaul the DXVA2 and DXVA-HD renderers to (1) accept any color space the processor supports instead of just YV12 and (2) do the color space conversion as late as possible to maximize quality. Probably a post-Gotham ToDo...