Hello, Vicul, you wrote: V> VMR9 works with DXVA1 Fairly, DXVA1 passed and never with it worked. I, even, did not see filters which it is a mode support. I know that DXVA, initially, had API where acceleration has been spread"by an equal layer on the decoder and a renderer that very much it was not convenient to vendors of decoders. Then, the Microsoft overworked API and made DXVA2 where all acceleration moved entirely to the decoder. Actually, if you are concentrated only on DirectShow - for you EVR will differ only that supports format NV12 which is necessary for display Direct3D c which generates DXVA2 the decoder. About windowless, I not in course as we entirely"moved"on own engine of a player where DirectShow filters are used separately from the graph, on a level with ffmpeg. Renderers that video that audio, at me the. It is all it is necessary for support of playing with the arbitrary speed forward and back, and also for game of plej-sheets. But, anyway, DXVA2 gives a huge scoring in speed, it is especially noticeable at playing back when GOP in advance in video storage, and it is then lost upside-down.