[mythtv-users] Strange "choppy" video during playback

[OJ]

2008/11/16 OJ <olejl77 at gmail.com>:
> 2008/11/15 OJ <olejl77 at gmail.com>:
>> I'm experiences the problem both during LiveTV and DVD playback.
>> Possibly others also, but not tested yet.
>>
>> This "chopping" happens every 2 min, and lasts 1-3 sec.
>>
>> I'm not sure what introduced this, but since I last had it working I
>> have changed from nVidia 6200 GPU to an ATI 4850 GPU. In addition I
>> have updated to trunk all along.
>>
>> Due to what seems like a bug with the fglrx driver from ATI had did as
>> described in the 2nd post here:
>> http://forums.dvbowners.com/index.php?showtopic=10431
>>
>> I haven't seen anything suspicious in the frontend logs, but on the
>> backend I see a pattern, but I don't know if it relevant.
>> (the logs are from LiveTV)
>> When this sequence is on the backend there is "chopping"
>> 2008-11-15 11:27:14.437 JobQueue: Currently set to run up to 1 job(s) max.
>> 2008-11-15 11:27:14.438 JobQueue: GetJobsInQueue: findJobs search
>> bitmask 4, found 0 total jobs
>> 2008-11-15 11:27:39.338 AutoExpire: Adding Programs to 'Do Not Expire' List
>> 2008-11-15 11:27:39.338     1429 @ 2008-11-15T11:19:16 in use by
>> player on stuepc
>>
>> When this sequence is on the backend there is _not_ "chopping"
>> 2008-11-15 11:28:14.439 JobQueue: Currently set to run up to 1 job(s) max.
>> 2008-11-15 11:28:14.440 JobQueue: GetJobsInQueue: findJobs search
>> bitmask 4, found 0 total jobs
>> 2008-11-15 11:28:41.105 AutoExpire: Adding Programs to 'Do Not Expire' List
>> 2008-11-15 11:28:41.105     1429 @ 2008-11-15T11:19:16 in use by
>> player on stuepc
>> 2008-11-15 11:28:41.105 AutoExpire: ExpireLiveTV(10000)
>> 2008-11-15 11:28:41.105 AutoExpire: FillDBOrdered: Adding Short LiveTV
>> programs in starttime order
>> 2008-11-15 11:28:41.106 AutoExpire: SendDeleteMessages. Nothing to expire.
>>
>> When this sequence is on the backend there is "chopping"
>> 2008-11-15 11:29:14.440 JobQueue: Currently set to run up to 1 job(s) max.
>> 2008-11-15 11:29:14.440 JobQueue: GetJobsInQueue: findJobs search
>> bitmask 4, found 0 total jobs
>> 2008-11-15 11:29:41.107 AutoExpire: Adding Programs to 'Do Not Expire' List
>> 2008-11-15 11:29:41.107     1429 @ 2008-11-15T11:19:16 in use by
>> player on stuepc
>>
>> Any tips on how to solve it, or what could be causing this?
>>
>> A few I have managed to avoid it the problem. I have started the
>> backend and frontend with different verbose options, but I don't know
>> if this is what is causing it or something else.
>>
>
> I have not seen this problem after I did an upgrade made available
> from Fedora today. The most likely updates to solve it is:
>
> kmod-fglrx-8.543-0.3.8.11beta.fc9.6.x86_64
> kmod-fglrx-2.6.27.5-37.fc9.x86_64-8.543-0.3.8.11beta.fc9.6.x86_64
>

The problem has reappeared (or maybe it never disappeared), and I have
been struggeling with it for I while now. I have found a different
pattern also. Everythime the playback stops for 1-2 sec I see an
increase in available RAM. I did some simple logging of the RAM usage
on my computer. (Manually supervised it using 'top').

- When I reboot my system, the system stabilizes on using approx.
825MB RAM (mythfrontend and mythbackend is startet automatically at
start up).
- When I enter LiveTV the used RAM increases with 50 -100MB each minute.
- Every 2-3 min the playback stops for 2-3 sec.
- At the same time as the playback stops, 130 - 300MB RAM is "released".
- Between each playback stop the used RAM has increased (30 - 100MB).

I have no idea what is happening so any help would be greatly
appreciated. All the numbers are approxemately values, but I could
probably make a script to make it more scientific, if it will make a
difference.