[mythtv-users] LiveTV stutter while in EPG/Guide

[Mark Greenwood]

On 24 Oct 2012, at 13:04, Matt Piermarini wrote:

> 
> On 10/24/2012 07:27 AM, Scott Harris wrote:
>>>> I'm working on wife factor here.. Live TV does work, with a couple sub-second pauses here and there, but wife acceptable.  The problems I'm having is while watching liveTV, and I bring up the EPG, the >>smaller TV picture in the corner will stutter.  A couple seconds after bringing up the guide, it will be fine.  Then, after each up/down arrow press to browse the guide will result in the same stutter, level >>out, stutter, level out, stutter, level out, etc. It works, but is very annoying.
>>>> 
>>>> This happens on both frontends: (core2duo/NV G210 and Nvidia ION -- both using vdpau). -- HDHR Prime directly connected to backend. Tried both .25 and .26.  I did NOT have this problem on .24. >>Happens on any VDPAU profile.. happens on any content (1080i, standard-def (which actually is worse believe it or not)).
>>>> 
>>>> Does anybody else see this, and if so, do you just deal with it?
>>>> 
>> 
>>> This is not much help but I'm having the same issue too. 0.24 was fine but on 0.26 every time I press the mouse while the EPG is up the picture stutters. I kind of just deal with it but it's got to the stage >where I'm contemplating going back to 0.24 because it's so annoying.
>> 
>>> Mark
>> 
>> In 0.25, apparently code was changed so that every time you jump to a new channel (you'll notice there is no stutter if you scroll horizontally across the time), some stuff including a sql query is done to determine if the channel you just navigated to would be tunable (i.e. it doesn't have a scheduled recording with new free tuners, etc).  The "stuff" that happens causes the stutter while it processes.  I agree, it's annoying, but apparently necessary.
>> _______________________________________________
>> 
> I agree that it does more "work" when moving channel to channel in the guide, but I can't believe that it's so much as to cause the video to get starved for resources.. the CPU's are only at 5%.   The network might get saturated for the SQL queries, as it is streaming the video from the BE and the mysql engine is on that same backend.

Network issues can't be my problem as I'm running a combined FE/BE. The processor is only an atom though, but like you say with VDPAU rendering the CPU usage during live TV is a little under 10%. Might it be some disc bottleneck that has appeared in recent kernels?

Mark

> I'll check that.  Has anybody tried jumbo frames (MTU 9000)? Good/bad/no difference?
> 
> Matt
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