[mythtv-users] Weird jitter problem

alan alan at crabbnet.com
Thu Sep 27 10:43:32 UTC 2007

I've had a similar if not the same problem.  I've noticed that anytime
there are subtitles, or a lot of white on the screeen, or when the credits
roll, I get a lot of jitter.  I started having this problem before updating
to v0.20.2 and it's just seemed to get worse with the update.

I decided about 2 weeks ago to update, hoping it would resolve some of the
issues that I've had, but instead they only got worse.  After the update I
see more jitter, the video is choppy (even on recordings that were recorded
pre update), and my video goes to sleep about every 20 or so minutes.

On Sat, 22 Sep 2007 10:00:06 +0100, James Fidell <james at fidell.co.uk>
> Unfortunately, perhaps unwisely, but I get harrassment from my wife
> and kids if things are out of action for too long, I've made a whole
> load of updates to my systems at the same time... Nova-T 500 cards in
> the backend, latest Centos5 updates, latest v4l-dvb on the front-end and
> the new nvidia video drivers, and an upgrade to v0.20.2.
> *Sometimes* during recording playback, I'm now seeing very bad jitter on
> some recordings only.  Even stranger, the jitter will even happen during
> the tail end of one programme before the one I actually wanted to
> record, stop for the duration of the recorded programme and then start
> again after the end.
> Neither the front end nor the back end are reporting any obvious errors,
> XvMC appears to be working fine.  Up until the changes, I'd never
> noticed any problems.  Both back end and front end are 2.4GHz P4
> machines with 1GB+ RAM.
> I'm going to see if I can set up another front end to see if the problem
> is consistent (my existing "other" front end is an EPIA M10000 box which
> seems a bit marginal for performance and probably isn't the best
> comparison).  I'm also going to try stuff like transcoding the
> programme, playing it back outside mythtv on the same box, playing it
> back outside mythtv elsewhere, to see what results I come up with.
> Any other places I should look/things I should check/ideas about the
> cause?
> James
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