[mythtv-users] Recordings spontaneously slow down

[Craig Read]

Craig Read wrote:

>
> Philip Nelson wrote:
>
>>
>>  
>>
>>> I've been having a problem for a while (but only since switching to
>>> .17), where occasionally, partway through recording something, it will
>>> suddenly slow down -- the  video slows to about 70% normal speed, and
>>> the audio drops in pitch accordingly.  It doesn't happen all the time,
>>> and I cannot reproduce it, nor do I have any idea as to what causes it.
>>> I know that the problem is during recording, because if I export the
>>> .nuv to another format, the problem remains.  Has anybody else had this
>>> problem?
>>>   
>>
>>
>> I am having either the same problem as you or something similar (also
>> happened since 0.17) - part way through a recording, quite randomly, 
>> sound
>> drops out totally and video slows right down. Eventually (perhaps 5-10
>> minutes) it speeds up again, but audio doesn't come back - it's very
>> frustrating.
>>  
>>
> That's exactly the same problem I'm having Philip.  I'm in Australia 
> and it's only occurring  on 3 channels (9, 7 and 10), but doesn't 
> happen on 2 or SBS.
>
>> Are you using dvb? For me, when this happens, the mpeg stream goes 
>> bad for
>> a second or two (as if I've got a low signal, but I don't think I do),
>> audio then cuts out and video goes slow. It seems to happen quite
>> randomly, and has happened when I've been watching live tv - I changed
>> channels, changed back and it was fine again.
>>
> I am using dvb (two Twinhan DST cards), and it does seem to happen 
> when I get poor signal for a second or two (either due to signal 
> problems or the back-end not keeping up with error correction).  I 
> haven't noticed it while watching live tv, but I don't use the box to 
> watch live tv. 

I have done some testing today and have noticed this occurring on Live 
TV as well.  When I view the mythfrontend output, I always get 
"prebuffering pause" or "decoding error" in the log just when it 
happens.  It seems to happen less when I turn extra sound buffering OFF.

Craig...


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