[mythtv-users] E: nvidia new drivers hdtv/interlacing, any benefit for us non HDTV people?

[J. Donavan Stanley]

Thomas Börkel wrote:

> HI!
>
> J. Donavan Stanley wrote:
>
>>>> It's highly dependent on the shows you watch,  most shows I watch 
>>>> look perfect as long as I have the A/V sync turned on, those that 
>>>> don't look 
>>>
>>>
>>> You mean the experimental A/V sync? What about jitter reduction?
>>
>>
>> A/V sync requires jitter reduction in 15.1, recent CVS builds have 
>> the two separated if memory serves me.
>
>
> I did not try A/V sync, yet. What does it do exactly? For me, audio is 
> in sync with video, as far as I can tell.


A/V sync tries to ensure that the video is being displayed in sync with 
the vertical retrace of your TV.  This results is much smoother looking 
video.

> 1.
> With the old NVidia driver, I could not watch car racing, because the 
> cars jumped. With the new driver, this jumping is gone. I think that's 
> because I set the Flicker Filter in the nvidia-settings tool to 1 (0 
> does not work correctly), where the default is 127 (out of 255).
> But the motion of the cars still looks blurry.

I have mine set to something like 101 because lower than that flickered 
too much (oddly enough). 


> 2.
> When I watch shows from NTSC land, that have been converted to PAL, 
> motion and panning is jerky.

I would imagine it would be since they use different refresh rates so 
you're never going to get "perfect" NTSC output on a PAL TV..


> I have big audio buffer on and also enabled jitter reduction. Without 
> that, background motion is always jerky (even for native PAL shows).
>
> What else can I do? Will A/V sync and kerneldeint help eliminate blur 
> and jerky motion?

Both might help.  Also make sure that you're not using Twinview, or XvMC 
and that you've told the nvidia card that you have only have a TV 
connected and what format the TV is in.


Using a higher bitrate might also help.  It'll almost certainly help 
overall quality.