[mythtv-users] Video 'waves' of speed up, slow down watching recorded TV

[Tom Bongiorno]

On Wed, Dec 5, 2012 at 3:25 PM, Dan Gravell <dan.gravell at talk21.com> wrote:

> Ah, apologies, but it turns out I was running the nvidia proprietary
> drivers after all ("version current").
>
> I re-enabled standard VDPAU (it was on 'Normal' playback config before)
> and the results are interesting... one CPU is now always pegged at 100% CPU
> or thereabouts. A/V sync is always a negative number.
>
> I wonder why the CPU usage appears *greater* when VDPAU is enabled?
>
> But most importantly, the speed up/slow down appears to be lessened. I'll
> keep my eye on it, the extent to which it is manifest depends very much on
> the video content being watched.
>
> Dan
>
>   ------------------------------
> *From:* HP-mini <blm-ubunet at slingshot.co.nz>
> *To:* mythtv-users at mythtv.org
> *Sent:* Wednesday, 5 December 2012, 17:45
> *Subject:* Re: [mythtv-users] Video 'waves' of speed up, slow down
> watching recorded TV
>
> On Wed, 2012-12-05 at 15:33 +0000, Dan Gravell wrote:
> > This might be a little hard to describe... I am using a Zotac ZBox
> > ID41 as a frontend only, connected to a backend via powerline
> > ethernet. It's a Mythbuntu 11.10 install.
> >
> >
> > I'm using nouveau I think. Should I be using the proprietary NVidiaAnd
> the sp
>
> > drivers? Mythbuntu offered both at installation time, and with no
> > other information as to which one to choose I decided on nouveau.
>
> > I have tried VDPAU and VDPAU Slim, both seem to give the same
> > behaviour.
> >
>
> That sounds like stuttering/frame dropping from having an under powered
> CPU performing decoding.
> The later nouveau driver has VDPAU overlay support only..No decode so
> the CPU is used.
>
> I would try the nVidia proprietary driver & VDPAU normal.
> The ION shared system RAM setup could require a particular RAM
> configuration (allocated size & number sticks), see Mythtv.org wiki..
>
> Brett.
>
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>
Interestingly, I have had the same behavior with all of my frontends with
playback of my blu-rays under videos.  I have several similar GPUs in my
three Zotac IONITX-C-U, three Zotac ZBox ID11, and one NVidia GT210.
 Panning shots are the most obvious.  The videos plays back
slow-fast-slow-fast...  Audio is unaffected, and no obvious dropped frames.
 It is still watchable, but rather annoying.  I am running Mythbuntu 12.04
with .25.  I will admit that I didn't do any debugging yet.  I will look
into it this weekend.

-Tom
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