[mythtvnz] Pixellation Every ~ 20 minutes

[Nick Rout]

On Tue, Oct 16, 2012 at 7:13 PM, Curtis Walker <sultanoswing at gmail.com> wrote:
> On 16 October 2012 17:56, Noel & Diane <noel at igrin.co.nz> wrote:
>> Random thought to ponder..
>> If not a signal strength issue, maybe a thermal issue with the card?
>> Perhaps the card components become out of tolerance when "warmed up" after
>> 20 odd mins of operation....
>> I would obtain the use of a digital signal strength meter & check the signal
>> strength first & verify packet integrity before delving into potential
>> internal hardware or software issues.
>> Noel
>>
>>
>> -----Original Message-----
>> From: Brendan Dacre <bjdacre at gmail.com>
>> Reply-to: MythTV in NZ <mythtvnz at lists.linuxnut.co.nz>
>> To: MythTV in NZ <mythtvnz at lists.linuxnut.co.nz>
>> Subject: Re: [mythtvnz] Pixellation Every ~ 20 minutes
>> Date: Tue, 16 Oct 2012 10:14:57 +1300
>>
>>
>> On 16 October 2012 07:32, Paulgir <paulgir at gmail.com> wrote:
>>
>> On Mon, 15 Oct 2012 16:13:03 +1300, Robin Gilks <g8ecj at gilks.org> wrote:
>>
>> Just a random idea...
>>
>> Has anyone with this problem tried to manual schedule a recording at odd
>> start and end times to get away from any external effects being on the
>> hour or half hour?
>>
>>
>>
>>
>> I'm not sure there are actually on the hour or half hour.I think it is more
>> like 20 to 30 mins after the scheduled recoding begins.Of course this looks
>> like an hourly thing because the broadcasts are scheduled that way.
>>
>> -Paul
>>
>>
>> Paul,
>>
>> I think the point of Robin's suggestion is this;
>>
>> If the problem occurs at the same time after the hour, then a scheduled or
>> repeating event might be a likely culprit.
>>
>> If the problem occurs at the same offset into the recording, it may be a
>> buffer overflow issue or something like it...
>>
>> Brendan
>>
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>>
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>
> Good random thought. I had the same one, and swapped out my GTX460 for
> a spare GT430 - no difference.
>
> I also - on balance of evidence and anecdote - now think this is a
> buffer issue. Pixellation occurred while watching LiveTV today at
> around the 20 minute mark (started watching at 17:15, so not an "on
> the hour" problem or scheduling problem).
>
> Stopping LiveTV as the pixellation starts and restarting it straight
> away (signal 98%, SNR 2.4dB) resolved the issue. Problem occurred ~10
> minutes later and was again resolved (or preempted from going to a
> complete blur) by restarting LiveTV.
>
> Now - how to find the cause .... ?


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