To get motionadaptive you have to output only NV12 (or maybe YUV2) colorspace- in ffdshow you also have to set interlace flag to auto. DXVA checker shows motion adaptive is possible on my 3200 HD up to 1920x1080 (with 64x2 5000+).@jov12v: If you are happy with the bob deinterlacing of your 1080i material and think it is adaptive deinterlaced, I don´t mind.
OK, sorry but there has been much progress with ffdshow recently- it is a rival for Core AVC (except it is free). I am getting actually less than 50, average around 47% on BBC HD 1080i 16Mbps. With Luxe HD 1080i 7.5Mbps I get average 41%, no frames dropped and 50 frame rate. You have to set output to only NV12, set interlace flag in output media type and set to auto- hardware deinterlacing is then enabled. You also have to use VMR7 or Overlay renderer (in XP at least).@jo16v: If you are happy with the bob deinterlacing of your 1080i material and think it is adaptive deinterlaced, I don´t care. And there is no way to playback 1080i with an AMD X2 5000+ with ffdshow with 50% CPU usage. It won't cope with real 1080i withou stutter.