[mythtv-users] Jerky video & prebuffering pause messages with MergedFB multi-screen setup

[Michael Lynch]

On 6/5/06, Gee, David <david at allpowerfuldave.com> wrote:
> Hi,
>
> I have a dual-head setup using the DVI and VGA outputs on my ATI Radeon
> 9200SE video card. Xorg is set up to use the "radeon" driver, and it
> uses the driver's MergedFB option for the dual-headedness, because I
> understand it's better than the generic Xorg multi-head capabilities
> (and also I couldn't get the Xorg native stuff to work). Anyway, when I
> attempt to play TV through Myth, it's very jerky (like 1 second of
> audio/video, then a few seconds pause, etc.), and the console outputs
> the following stuff.
>
> 2006-06-05 18:58:21.037 TV: Changing from None to WatchingLiveTV
> 2006-06-05 18:58:21.058 Realtime priority would require SUID as root.
> 2006-06-05 18:58:21.133 Video timing method: DRM
> 2006-06-05 18:58:24.240 NVP: prebuffering pause
> 2006-06-05 18:58:27.329 NVP: prebuffering pause
> 2006-06-05 18:58:30.431 NVP: prebuffering pause
> 2006-06-05 18:58:31.032 New DB connection, total: 3
> 2006-06-05 18:58:31.041 Connected to database 'mythconverg' at host:
> localhost
> 2006-06-05 18:58:31.961 rebuffering (7221 32768)
> 2006-06-05 18:58:32.101 rebuffering (19993 32768)
> 2006-06-05 18:58:33.629 NVP: prebuffering pause
> 2006-06-05 18:58:33.873 rebuffering (19901 32768)
> 2006-06-05 18:58:34.333 rebuffering (1549 32768)
> 2006-06-05 18:58:37.026 NVP: prebuffering pause
> 2006-06-05 18:58:40.123 NVP: prebuffering pause
> 2006-06-05 18:58:42.936 TV: Attempting to change from WatchingLiveTV to None
> 2006-06-05 18:58:43.230 TV: Changing from WatchingLiveTV to None
> 2006-06-05 18:58:43.242 Enable DPMS
>
> This never used to happen when I was running in single head mode and I'm
> not quite sure what to do to fix it so I'd appreciate some suggestions.
> I'm running the latest version of Myth and the ivtv drivers, and I have
> a Hauppauge WinTV PVR 150 PAL TV card.
>
> Thanks in advance
>
> Regards
> David Gee
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>

I had a similar problem with an nvidia card and had to turn off
'realtime priority' in one of the myth frontend menus.  I'm at work
right now so I don't have the menus in front of me to find it.

After turning this off, the pauses/jerkiness stopped.