[mythtv-users] How to Prevent Freeze When Starting Playback

[Tom Wheeler]

I'm running 0.27, and all of my storage is locally mounted SATA disks on
the backend. No NFS or even external USB disks.

I do have a fair number of programs recorded, but in the hundreds rather
than thousands. I wouldn't think that would be enough to stress MySQL at
all, but I haven't looked at the database tuning parameters. I'm pretty
experienced with MySQL, so I will check those tonight.

I also haven't seen anything definitive in the logs, though since it's an
intermittent problem, it's kind of hard to correlate the timestamps with
when the problem occurs. I'll take a laptop with me when I watch TV tonight
so I can ssh into the backend and frontend and look at the logs in real
time while starting playback.



On Mon, Oct 6, 2014 at 6:34 AM, Tremayne, Steve <
steven.tremayne at honeywell.com> wrote:

>  Do you have a lot of recorded shows in your list – or just a few?
>
>
>
> It could be an issue with your database – for example, if there are a lot
> of recorded programs then when you start a show, Myth & the database need
> to work out which actual file your computer is actually going to start
> playing.
>
>
>
> I am in the process of setting up a new Myth box and saw this recently:
>
> http://www.mythtv.org/wiki/Tune_MySQL
>
>
>
> Just a thought…
>
>
>
> Cheers,
>
>
> Steve
>
>
>
> *From:* mythtv-users-bounces at mythtv.org [mailto:
> mythtv-users-bounces at mythtv.org] *On Behalf Of *Tom Wheeler
> *Sent:* 03 October 2014 23:27
> *To:* Discussion about MythTV
> *Subject:* [mythtv-users] How to Prevent Freeze When Starting Playback
>
>
>
> I have a combined backend/frontend and now an additional (separate)
> frontend, both running 0.27 on Mythbuntu. I have noticed with increasing
> frequency on both systems over the past several weeks that MythTV
> temporarily hangs when I start playing back a previously recorded show.
>
> To be a bit more specific, when I select the show I want to watch and
> click OK on my remote, playback often does not begin for a few seconds, and
> sometimes for as much as 45 seconds. I'd estimate that the frequency of the
> delay follows this pattern:
>
>  40% - No noticeable delay at all
>
>  30% - Delay of 3 seconds or less
>
>  15% - Delay of 3-5 seconds
>  10% - Delay of 5-10 seconds
>    5% - Delay of 10 seconds or more
>
>
>
> What I mean by "freeze" is that it continues showing the list of programs
> from which I selected (the video hasn't started playing yet) and the
> frontend no longer responds to input from the remote. In the extreme cases
> where it freezes for 20+ seconds, I start to doubt whether I'd actually hit
> OK in the first place, so I hit it again. Nothing happens, of course, until
> the program eventually starts playing and the system processes both clicks.
>
> Any idea what causes this delay and how I can eliminate it?
>
> Thanks,
>
> Tom
>
>
>
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