[mythtvnz] Pixellation Every ~ 20 minutes

[Paulgir]

On Fri, 05 Oct 2012 05:49:30 +1300, Pieter De Wit <pieter at insync.za.net>  
wrote:

> On 4/10/2012 22:34, Nick Rout wrote:
>>
>>
>> On Oct 4, 2012 8:07 PM, "Curtis Walker" <sultanoswing at gmail.com> wrote:
>>>
>>> Odd problem this.
>>>
>>> On all TV recordings, after around 20 minutes, the picture starts  
>>> becoming pixellated. Over the >>next 30 or so seconds it becomes more  
>>> and more pixellated until it looks like an impressionist >>painting.  
>>> The sound is generally OK, but does have the odd, brief "glitch" (a  
>>> noise like a modem >>negotiating). After no more than a minute, the  
>>> picture and sound suddenly return to normal.
>>>
>>> I'm fairly sure this is not a reception issue, since it seems to occur  
>>> so regularly, and at roughly >>the same time in each recording, and  
>>> for the rest of the recording picture and sound are perfect. >>Signal  
>>> strength and SNR are fine (98% and 2.3dB respectively, and this is  
>>> representative). Same thing >>occurs on all channels.
>>>
>>> It doesn't appear to be related to the playback, as the same  
>>> pixellation occurs in the same place >>whether viewing the recording  
>>> on desktop (nvidia) or Laptop (intel integrated), although it sounds  
>>> >>similar to symptoms reported by others on mythtv <0.25 which people  
>>> ascribed to vdpau and buffer >>settings.
>>>
>>> Could be some scheduled process is running every 20 minutes or so on  
>>> my disks? Although why it >>occurs ~20 minutes into a recording, and  
>>> never at other times, doesn't seem to fit with this either.
>>>
>>> Hmmmm ....
>>
>> I have seen similar stuff. I thought it was to do with the networking  
>> between my HDHR and my backend. >>I should indicate further.
>>
> Quite correct Nick. If you drop a few packets from the h264 stream, it  
> does this, the more your drop, the worst >the result (logical, I know :)  
> ). I used to see this with program changes (I am sure most of you have  
> seen my >rants on the main list), but since then I took a certain  
> supplier to task on a $99 deal for a 120gig SSD, >problem gone :)
>
> Why this happens at the 20 min mark is hard to say, can you tell us more  
> about your setup ? Perhaps more details >around CPU,memory,disk,mount  
> points ?
>
> Cheers,
>
> Pieter

In my case I have a combined BE/FE wit an Intel G620 2.6 GHz CPU,4GB RAM  
OS is on a separate drive to storage and is not performing comm flagging  
or transcoding.

Cheers

Paul

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