[Openchrome-users] CN700, XvMC and HDTV.

[Thomas Hellström]

Thomas Hellstr?m wrote:

>Hi, all
>
>I just got a chance to play around with a CN700 board.
>
>Unfortunately it seems like VIA has used the same video core as the 
>Unichrome Pro group B series (The K8M800 / K8N800 chips), and all nice 
>features that were present on the CN400 seem to be gone.
>
>This includes
>
>    * Mpeg2 decoder AGP DMA capabilities. This means that mpeg data
>      can't be queued up to the decoder and the processor has to wait
>      for decoder ready. Gone is the small CPU usage and you will
>      basically end up at 20% or so with a normal (SD) dvd.
>    * Mpeg2 decoder HD capabilities. The hardware decoder is not capable
>      of anything above 1024x1024. Smooth software decoding of HDTV
>      using a via processor should probably not work very well either.
>
>I'd say xvmc is more or less useless on this chip if the video player 
>has a good software mpeg2 decoder.
>
>If the HQV (video prefilter engine) is the same as the other group B 
>chips, then CN700 users can also say goodbye to future 
>composite-compatible playback.
>
>Out of curiosity it would be interesting to know how CN700 behaves with 
>VEXP and VEMP? Does anybody see any HD capabilities with those players?
>
>/Thomas
>
>
>  
>
I just got a confirmation from VIA that CN700 is indeed a Unichrome Pro 
group B.
No HD accelerated mpeg2 on that chip and its similar friends.

/Thomas

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