[mythtv] Ticket #10414: HDHomeRun: Bad Recordings (was: Bad Recordings - Choppy Playback)

Derek Atkins warlord at MIT.EDU
Fri Mar 9 17:44:57 UTC 2012


Tom Lichti <tom at redpepperracing.com> writes:

>>>  Does this happen with the latest HDHomeRun firmware? I assume some if it
>>>  happens with the prime as well; but I want to be sure you are using RTP
>>>  and not UDP streaming.
>>>
>>
>> Yes,  I have the latest firmware.   I downloaded and installed it about a
>> week ago as a trouble shooting step. I'm not sure how to verify it was rtp
>> and not udp.
>>
>> I'm almost certain it was both the prime and HDhr devices, but I cannot
>> recall with one hundred percent accuracy right now.
>
> Unfortunately even with the change put in today by Daniel, I still see
> the problem. The 4 concurrent HDHR streams are too much. CPU is still
> around 75-80%, and all recordings in progress become choppy. It is
> definitely the recordings, if I play them back after they are still
> choppy.

This leads me to believe the issue is that your backend cannot keep up
with all the data streams.  Perhaps the disk is too slow, or there's a
problem with the network card, or interrupts?  Can you run 'top' and
see, for example, if e.g. there is ksoftirqd spinning while all these
recordings are running?

I'm seeing similar things here, but I don't think it's a mythtv issue or
an HD Homerun issue.  I think it's a hardware issue on my backend
server.

> Tom

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available


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