[mythtv-users] HD playback slight jitter every 10 secs

[Henk D. Schoneveld]

On 10 Feb 2014, at 21:40, Monkey Pet <monkeypet at gmail.com> wrote:

> I haven't yet gotten to 100 percent jitter free HD playback on my Intel Mac Mini (1.83 GHz (T5600) Intel Core 2 Duo) frontend running ubuntu 13.xx using MythTv 0.27.xx.  Every 10 secs, there is a slight jitter or frame jump.  The jitter isn't noticeable unless you are actively looking for it which I have trained myself to do.   The playback stream was recorded from OTA recording on a HD homerun device.  The mythtv frontend is remote from the background and connected over ethernet 10/100.  The fact that it happens every 10 secs is weird.  Any tips of where to look and how to debug?
> 
> I have tried:
> 1. real-time threads, bumping the priority of the mythtvfrontend process, X process.
> 2. starting with a custom xsession which only launches mythfrontend (no window manager).
> 3. finding and killing off daemons which I don't need.
> 4.  I am using the 'Normal' video playback profile.  However I have tried all the others as well, none eliminates the issue.
> 
> Next on my list is testing the performance of the network.
Try running iotop -o and maybe you’ll be able to spot what is causing it. Some time ago I saw regular kswapd ‘blocking’ throughput, although kswapd was the messenger of some problem underneath.
> 
> 
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