[mythtv-users] 0.24-fixes, upgraded, VDPAU - LiveTV playback is choppy, watching as recording is ok

Dave Richardson mythtv at derdev.com
Wed Dec 1 00:39:12 UTC 2010

 On Tue, 30 Nov 2010 22:41:01 +0000 (GMT), Neil Cooper 
 <neilcoo at yahoo.co.uk> wrote:
> I seem to remember that somewhere in the settings you can set the
> size of the HD ring buffer. Especially as you said you can record and
> watch the show at the same time with no problems, it sounds to me 
> like
> your ring buffer may be set too small.
> --- On TUE, 11/30/10, KEVIN ROSS __ wrote:
> From: Kevin Ross
> Subject: Re: [mythtv-users] 0.24-fixes, upgraded, VDPAU - LiveTV
> playback is choppy, watching as recording is ok
> To: mythtv-users at mythtv.org
> Date: Tuesday, November 30, 2010, 2:54 PM
> On 11/30/2010 01:37 PM, Dave Richardson wrote:
>> Like so many open threads these days, I'll also say "on 0.23 - with
> the same hardware - this was working..." :-)
>> I have my HD local channels QAM thru HDHR with multirec enabled.
> Audio is SPDIF ALSA, passthru enabled. 0.24-fixes upgraded recently.
>> I have noticed that watching LiveTV for local HD broadcasts is very
> choppy (both video and audio). It never syncs up to smooth playback.
> Some channels differ in the degree of choppiness. Does not appear to
> differ if I choose another HDHR tuner.
>> System utilization (via 'top' or 'w') on a 2-core dedicated ION FE
> less than .90 at all times and generally less than .60 while I see 
> the
> issue.
>> I'm not seeing streams of errors in the mythfrontend.log
>> What confuses me is that if I record that same program/channel and
> watch the recording (even while recording is still active) the
> playback is great.
>> All other video media playback fine.
>> I don't understand why LiveTV playback seems to have different
> "performance", what should I be checking please?
>> TIA!!!
> I can think of a couple differences between LiveTV and Recordings.
> You can configure different storage locations for Live TV and
> Recordings. You can have different Recording Profiles for LIveTV and
> Recordings. Not sure what else could be different. Does pausing for a
> few seconds and resuming help at all?
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 Did a lot of trial and error.  Tried pause/rewind.  Tried change of HD 
 Buffer.  It seems that Advanced 2X isn't suitable on my kit for 1080 
 content.  I'm OK with Advanced 1X and Temporal 1X (fallback).  I'll keep 

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