[mythtv-users] playback not smooth regardless of source
Steven Adeff
adeffs.mythtv at gmail.com
Wed Feb 28 15:42:28 UTC 2007
On 2/26/07, Seth Daniel <mythtv.org at sethdaniel.org> wrote:
> Hello,
>
> I have a combined FE/BE myth box. AMD64 3800+, AM2 motherboard, 1G
> memory, Nvidia 6200TC.
>
> I have searched this mailing list up and down looking for a workable
> solution to my playback problems. No matter what I playback I get
> jitters or stutters (not sure what the difference is). It is especially
> pronounced during horizontal panning. I have no audio problems. Plenty
> of people have reported this in past e-mails. Responders have suggested:
>
> - disabling vertical sync; enabling vertical sync; enabling flipping
> etc... in nvidia-settings.
>
> I have done this and tried any number of combinations. If I turn
> all syncing off I get tearing (which seems pretty typical). Hard to
> tell if the jitters go away with all the tearing going on. I've
> also enabled and disabled the GL sync option in the frontend
> settings with no effect.
>
> - using various deinterlacing methods (bob; linear; etc...) or turning
> deinterlacing off.
>
> Tried these. Same problems. I typically run with Bob deint.
>
> - pci latency tuning
>
> My motherboard doesn't appear to support this (setpci has no effect).
> The BIOS doesn't have any options for setting latency.
>
> - turn off compositing in xorg.conf
>
> Did this to no effect.
>
> - turn on realtime thread scheduling (this I found in the mythtv howto)
>
> Followed the instructions. No difference in playback.
>
> - turn DMA on for hard drive
>
> I have an SATA drive. AFAIK the DMA is always on and you can't tune
> or see the setting through hdparm.
>
>
> I have tried different resolutions. Specifically 1080i and 720p. Both
> have the same jitteriness. I normally run at 1080i. This happens with
> pre-recorded SD TV shows, ripped DVDs, live TV, and live DVDs.
>
> The processor is dual core and playback rarely pushes any single core
> over 20%. Except for the frontend nothing else is doing much of
> anything.
>
> I am running a lightweight window manager (openbox). Ubuntu Feisty with
> the latest Ubuntu Feisty myth packages (one person claimed they had the
> same problems I am having and resolved the problem by rolling their own
> packages. That would be my solution of last resort).
>
> By default the frontend logs rarely log anything. When I ran the
> frontend with the 'all' log option I didn't see anything interesting.
> Then again I may not know what interesting would be.
what nvidia driver are you using?
--
Steve
Before you ask, read the FAQ!
http://www.mythtv.org/wiki/index.php/Frequently_Asked_Questions
then search the Wiki, and this list,
http://www.gossamer-threads.com/lists/mythtv/
Mailinglist etiquette -
http://www.mythtv.org/wiki/index.php/Mailing_List_etiquette
More information about the mythtv-users
mailing list