[mythtv-users] Playback problem -- random short pauses

[Andre]

On 23 May 2011, at 16:17, Steven Adeff wrote:

> On Mon, May 23, 2011 at 9:41 AM, Mark Lord <mythtv at rtr.ca> wrote:
>> On 11-05-23 08:08 AM, Steven Adeff wrote:
>>> Are any of the more involved Dev's other than JYA paying attention to
>>> this? (this is a callout for them to answer).
>>> 
>>> It's looking like this may be a major issue that many users, with
>>> varying levels of hardware, are experiencing. I think it may be time
>>> to  create a ticket for this issue, but it would be nice to have a dev
>>> that can work with us in figuring out what's going on, and how exactly
>>> to create a ticket that will lead to some debugging help from the
>>> dev's for the users experiencing the problem to use to troubleshoot.
>>> 
>>> the other end of all this is that it may be an issue that some of the
>>> further tweaking that's been done for the next release has resolved
>>> already. I'm wondering if anyone running off the latest git is
>>> experiencing?
>> 
>> 
>> I take it this is only (or is it primarily?) happening in trunk,
>> and not in 0.24-fixes?  I only run the latter here (no pauses).
>> 
>> What I would look for in the code, are sync(), fsync(),
>> and fdatasync() calls.  Those generally force writes to happen
>> and pause a lot of stuff to wait for them to complete in real-time.
>> 
>> Which can lead to tiny pauses and glitches elsewhere.
>> 
>> So just as a trial, perhaps grep through the code looking for those,
>> and temporarily remove them, to see if the problem then goes away.
>> That should prove/disprove this theory.
> 
> this is happening in 0.24-fixes for pretty much everyone, and looks to
> have started with 0.24 as people who changed no hardware and upgraded
> to 0.24 started experiencing the issue. I don't know if anyone using
> trunk is having the issue. it also does not look like everyone has the
> issue, and the severity varies as well. It also looks like it is also
> only an issue with HD content.

I see the same problem with SD too, well I did, I haven't watched any SD for months :-)

Andre

> 
> I think I will create a wiki page to keep track of each persons
> experience. A table with columns for specific issue notes, etc.
> 
> I think I may also need to temporarily upgrade to trunk to see if the
> issue goes away. Hopefully trunk is not severely buggy...
> 
> -- 
> Steve
> http://www.mythtv.org/wiki/User:Steveadeff
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