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

[Gee, David]

Michael,

Thanks for the suggestion. I tried disabling the realtime priority
option, but it didn't seem to make any difference. As a variation, I
also tried running mythfrontend as root so it could take advantage of
the realtime priority threads, but that didn't make any difference either.

Any other suggestions?

Regards
David Gee

Michael Lynch wrote:
> 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.
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