[mythtv-users] what resolution is mythui with a PCI VDPAU video card?
raymond at wagnerrp.com
Sat May 15 00:27:07 UTC 2010
On 5/14/2010 20:12, Brian J. Murrell wrote:
> Just doing the math, a 132MB/s PCI bus should be able to carry 63 bytes
> for every pixel on the screen:
> 132000000/(1920*1080) = 63
> Why is that not enough for even raw HD? Not that I really care about
> being able to push raw HD, but I would like my UI at 1920x1080 on my
You missed a couple steps there. That's at 60fps, and three colors per
pixel at one byte each. Now technically, we're using YUV, so you halve
that bitrate, but youre still talking about ~190MB/s, on a bus that can
only theoretically hit 133MB/s.
Now the UI is not going to be full motion video, so it won't need
anything like that kind of bandwidth, but you still need enough
bandwidth to send whatever your video content is unscaled (Xv does
scaling on the video card).
More information about the mythtv-users