[mythtv-users] nVidia driver 304.88: problems

Jean-Yves Avenard jyavenard at gmail.com
Mon Apr 15 04:37:16 UTC 2013


Hi


On 15 April 2013 14:25, George Nassas <gnassas at mac.com> wrote:

> Sorry, brief side question: so driving your TV at 24p depends on having an
> nVidia card? I'm using intel graphics which, of course, doesn't have NVctl
> and I've been trying to figure out how to get myth to switch to 24p on
> material encoded that way. Where would I look if I wanted to have a go at
> using xrandr for intel cards?
> - George
>
>
If NVCtrl is available (with nvidia drivers only) this is what myth will
use.
If not, it will use xrandr on linux, other on mac etc...

Problem  with xrandr is that the frequency rate is stored as a short. So
you'll have 24, 50, 60 and that's about it.

NVCtrl allows much finer control: 23.976Hz (US) vs 24.00Hz (PAL), 59.976Hz
vs 60Hz etc... as what NVCtrl reports is the full ModeLine so you can
calculate the frequency from there.

But the instructions for getting myth to switch the refresh rate to follow
the content being played are the same across the board.
Just that with xrandr only (Intel, AMD and others), miss will use 24Hz no
matter if the video is 24 or 23.976Hz.

Jean-Yves
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