[mythtv-users] LiveTV: stutter at program start/change resolved by short pause..?

Jan Schneider jan at horde.org
Wed Sep 29 08:25:44 UTC 2010


Zitat von Nicholas Fasano <nfasano at mac.com>:

>> Hi all,
>>
>> I'm in the process of setting up a dual boot Mythbuntu 10.04 system  
>> but this is not operational yet so I'm still using Mythbuntu 9.10  
>> with a combined BE/FE and a separate FE (also on 9.10).
>>
>> This is the symptom: When watching LiveTV only, whenever we start  
>> it or when there is a program change (while not changing channels),  
>> there will be a noticeable video stutter (audio is fine) that will  
>> start and remain until the playback is paused and resumed. The  
>> pause could be a very short one (less than a second) or longer, it  
>> will be sufficient to make it flow normally again. This happens on  
>> the combined BE/FE and on the remote FE. I don't see anything in  
>> the logs and it always works OK when watching recordings.
>>
>> Anybody have this? any solution? I'm hoping that my future 10.04  
>> setup won't have it.
>>
>> I'm using an HD-PVR and an HD stb for recording.
>>
>> Thanks for any insight,
>> Daniel
>> P.S. I have run the script to clean up the database without any  
>> noticeable effect. I have a separate OS disk (250GB) less than 1%  
>> full and two 1TB disks for recordings that are about 85% and 50%  
>> full.
>
> Daniel,
>
> This has been an issue for me for quite some time.  I originally  
> posted the issue in December 2009 in the following thread:  
> <http://www.gossamer-threads.com/lists/mythtv/users/414307>.  As you  
> can see, it only got a few responses even though our setups seem to  
> be fairly standard mythtv installs.  Since then, I've kept my system  
> updated with the latest 0.23 fixes and kept the hdhomerun updated  
> with the latest firmware, but I have not found a solution (or anyone  
> else interested in finding one).  I think the problem is probably a  
> lot more common than the posts would suggest, but perhaps it hasn't  
> gotten much developer attention since it only involves live TV,  
> which the developers detest.  If anyone else has the same issue, or  
> better yet has a solution, please reply to this thread and maybe we  
> can at least try and piece together what is going on.

I'm seeing this too, especially with high bandwidth channels, for  
example HD content. Defragmenting the XFS storage improved the  
situation a bit, but not completely, and it gets worse again after a  
while.
I don't see this behaviour always, but regularly. Another symptom of  
what I guess has the same cause, is some loss of stream content during  
the program change. The video/audio almost freezes for 1-2 seconds,  
dropping a frame or two during this pausing, and then either continues  
normally, or with the symptoms you describe.
Programs that are being recorded in the background during that  
freeze/frame loss usually lose a few frames too.

Jan.

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