Poor HD playback on QAM

[Modular]

I've been getting poor HD playback (actually poor playback on anything from my QAM tuner). In the config I cannot choose what decoder h.264 files are run with. Is there a way to register the decoder I want to use? I have the Purevideo decoder which as I understand works pretty well with ATI cards as well as nVidia ones, and I know that the HD4850 is more card than is needed for quality hardware based HD decoding, I just don't know how to force the hardware to decode the channel stream.

When I play an HD file, the Purevideo decoder panel tells me that I'm using software decoders and my processor is pegged at 100% the whole time.

[pBS]

afaik, the purevideo only does mpeg2...no .264...
there's a section in config to set .264 codec, if a known codec doesn't show there, you have to add it to config yourself in 'supported' codecs..

try ffdshow for h.264....or coreavc...or even mpc codecs..[now really good w/dxva]

also, ati avivo should be able to do h.264 w/hardware accell too...
[add 'ATI MPEG Video Decoder' to supported decoders for 264 and mpeg2 in config]

[sub]

I've been getting poor HD playback (actually poor playback on anything from my QAM tuner). In the config I cannot choose what decoder h.264 files are run with. Is there a way to register the decoder I want to use?

QAM is MPEG2, so you dont need to worry about H.264 decoders.

Its apparently pretty common that the newest ATI cards wont do hardware acceleration of HD MPEG2 playback. Do a search for this on the avsforums, where this sort of stuff is discussed all the time (driver bugs, extra registry settings required etc).

[pBS]

seriously? then how do i get only 17% cpu on a 1.6ghz? i assumed the actual 'decoding' was done in software, but the deinterlacing,[90% of the work] is done by the hardware so almost as good as full hardware accell...

plus i do get decoding too when using dxva-checker with some codecs..
[shows hardware decode and hardware deinterlace active]

[gazoo]

Yeah, it's SUPPOSED to do HD MPEG2, but it doesn't for me either. I have a Vista box with a 780g motherboard with integrated ATI HD3200 and H.264 works great, but no HA for MPEG2. However, other ATI's may work but I know mine doesn't and I haven't bothered to figure it either.