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-   -   Stuttering video at 50Hz (http://www.nvnews.net/vbulletin/showthread.php?t=154342)

thecapsaicinkid 08-22-10 12:53 PM

Stuttering video at 50Hz
 
I'm seeing regular stuttering in PAL video when running at the default 1920x1080 50Hz but not apparent when I use nvidia-settings to switch output to 60Hz. It's most noticeable when the video pans and you can see the video stutter ever half second or so.

Ubuntu 10.04 64bit
Nvidia onboard gpu with driver 195.36.24-0ubuntu1~10.04
Xorg.conf http://pastebin.com/fPvnkGAj
nvidia-settings cleared

Any ideas?

Many thanks

brebs 08-22-10 10:54 PM

Re: Stuttering video at 50Hz
 
Follow the procedure at how to report a problem.

thefirstm 08-23-10 09:33 AM

Re: Stuttering video at 50Hz
 
You don't need an nvidia bug report to know the cause of this problem. It occurs because the PAL framerate must not be evenly divisible into 50. It apparently is evenly divisible into 60. Why can't you just use 60hz?

Deanjo 08-24-10 03:48 PM

Re: Stuttering video at 50Hz
 
Quote:

Originally Posted by thefirstm (Post 2306495)
You don't need an nvidia bug report to know the cause of this problem. It occurs because the PAL framerate must not be evenly divisible into 50. It apparently is evenly divisible into 60. Why can't you just use 60hz?

PAL is evenly divisible in to 50 Hz. PAL Framrate is 25.0000fps

thefirstm 08-24-10 06:13 PM

Re: Stuttering video at 50Hz
 
Still, why not just use 60hz?

poltsy 08-27-10 06:59 AM

Re: Stuttering video at 50Hz
 
Disable composite, twinview and gpu scaling. They all make mode setting confusing so what you think is 50Hz might be something completely different in reality.

Looking at the config it seems there isn't really anything that should stop it from working properly. I'm using pretty much the exact same settings and playback is very close to perfection; looking at a news scroller in vdr-xineliboutput it very very rarely pauses for a frame's duration or so.

You could try disabling edid and completely defining the modes yourself, probably won't change a thing but at least then it won't be able to pick the wrong one and lie which one you're seeing.

The driver version is a bit old though, have you tried anything newer?

Perhaps there are settings in your tv that are causing the issue, some "image enhancing" filters or such?


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