[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
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