[mythtv-users] nvidia 6x00 vs mythtv and mpeg offload

[Michael T. Dean]

On 01/26/2006 02:01 PM, Big Wave Dave wrote:
> My understanding is that the MythTV developers are still working on
> the "hooks" to be able to use the 6x00 hardware decoding.  It sounds
> like the cards use something other than XvMC.
>
> I personally would like to have component-out from my MythTV, but it
> doesn't seem any of the cards that have  the capability can do XvMC. 
> I'd prefer to not have to use the audio-authority box.
>   
XvMC works fine on the 6200, 6600, 6800, 7800, and all the other cards 
that use pixel shaders for video.  What's changed, however, is how it's 
implemented.  Like any good API, XvMC is independent of the 
hardware--it's up to the drivers to map API calls to hardware calls, so 
it's been handled by NVIDIA.

Oh, and NVIDIA hasn't implemented some parts of Xv--including the 
XV_BRIGHTNESS, XV_CONTRAST, XV_COLOR, XV_HUE attributes--for these 
cards, so you can't use standard Xv video settings to adjust your 
picture.  I doubt that NVIDIA will ever include support for these 
attributes as their position seems to be that applications should 
instead use OpenGL-based video output instead of Xv-based.  The 
OpenGL-based video output is probably what you're thinking of when you 
say that some work hasn't been done.

Mike