[mythtv-users] 0.24+fixes - tearing, /dev/rtc permissions and getting openGL to work

[Brian J. Murrell]

On 11-02-23 08:33 PM, Mike wrote:
> 
> i) very slight tearing about midway across the screen typically on
> horizonatl panning

Welcome to the club.  My Revo 1600 with ION tears and so does my 8400 GS.

> ii) /dev/rtc is symlinked to /dev/rtc0 which only have root access permissions

Same here.

> iii) Player(0): Waited 100ms for video buffers messages occasionally

Yeah, I get that quite a bit on my 8400 GS.

> iv)  I have seen, with usleep moreso, the sound lagging the video

I don't get that on either of my frontends.

> The tearing problem is likely related to Vsync and OpenGL.  I have
> instructed nvidia-settings to enable this feature.

And did it solve it?  No combination of settings I have tried has been
able to resolve this.

> However, in (ii) I
> see it using usleep unless I start mythfrontend as sudo/root.  Then I
> see RTC.  I've never seen OpenGL method.

I have to admit having never fiddled with trying to get /dev/rtc sync
working.

> For (iii) I saw many of these errors with 0.23 and hence downloaded
> the latest 0.24 and compiled it with --enable-vdpau.  It took a while
> to figure out that this didn't include VDPAU without having the -dev
> package installed.  Not it is available and I can configure VDPAU
> settings in mythtv.

I am most definitely using VDPAU on my 8400 GS (as well as the ION in
the Revo of course) frontend and I see that quite frequently still.  I
even see it playing local DVDs.

> What I would like to know is how to ensure/check/enable OpenGL as this
> seems to be a problem with tearing and possibly the timing method.
> Problem (iv) seems to be much better when RTC is used so how do I fix
> (ii)?  I can change the permissions but they dont persist a reboot.

A udev rule would be the key here.

But do you find that having /dev/rtc really is the panacea?  I thought
simply having a working OpenGL would be enough.

Cheers,
b.

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