[mythtv] Failed DVB recording

[David Whyte]

Are you guys experiencing this on channels that normally tune and cards that 
work fine otherwise?
 Twice I have had a recording not happen because the card could not tune. 
All I did was restart mythbackend and the card would then tune fine.
 I thought maybe my hardware was gettting dodgy, but if you are also 
experiencing this, maybe it is a bug.
 FTR, I am using 2 x Avermedia 771 DVB-T's.
 Dave

 On Apr 7, 2005 5:58 PM, Tom Hughes <tom at compton.nu> wrote: 
> 
> In message <e558cc3b4d.tom at loxley.compton.nu>
> Tom Hughes <tom at compton.nu> wrote:
> 
> > In message <1108064943.420bbaaf3b10f at www.digitalregime.com>
> > Taylor Jacob <rtjacob at earthlink.net> wrote:
> >
> >> Quoting Tom Hughes <tom at compton.nu>:
> >>
> >> > I had a DVB recording fail last night. The relevant log extract is:
> >>
> >> > 2005-02-09 18:30:04.271 DVB#0 DVB signal 5300 | snr 5000 | ber 
> 143af12 | unc
> >> > 7961d18
> >> > 2005-02-09 18:30:04.273 DVB#0 Status: LOCK.
> >> > 2005-02-09 18:30:04.273 DVB#0 Multiplex Locked
> >> > 2005-02-09 18:30:10.966 DVB#0 Timeout Getting PMT
> >> > 2005-02-09 18:30:11.096 DVB#0 ERROR - Tuning for channel #4 failed.
> >> > 2005-02-09 18:30:11.176 Changing from None to RecordingOnly
> >> > 2005-02-09 18:30:11.237 DVB#0 Recorder: Card opened successfully 
> (using PS
> >> > mode).
> >> > 2005-02-09 18:30:12.265 DVB#0 WARNING - No data from card in 1 
> second.
> >> > 2005-02-09 18:30:13.316 DVB#0 WARNING - No data from card in 1 
> second.
> >> > 2005-02-09 18:30:14.318 DVB#0 WARNING - No data from card in 1 
> second.
> >> >
> >> > Obviously it failed to tune the right channel due to a timeout
> >> > getting the PMT from the multiplex. I don't know what the cause
> >> > of that was, but what happened afterwards is that it continued
> >> > to pretend it was recording and spew out those "No data" messages
> >> > for the duration of the program.
> >>
> >> Can you tune to this multiplex with zap and look at the PMT deltas? 
> There is
> >> currently a 5 second PMT timeout when attempting to get the PIDs for 
> the
> >> desired channel. The average PMT delta is .1 to .2 seconds, so I 
> suspect that
> >> there was some issue with the deilvery of it.
> >
> > OK. I've worked out how to do this now by tuning with tzap and then
> > using dvbsnoop to look for the PMT data. They are coming in about
> > every 0.19 seconds most of the time - one or are longer but the longest
> > that I've seen is about 0.35 or so.
> 
> I've had this happen a few more times recently so I decided to try
> increasing the timeout to see if it helped but I when I went to look
> at the code I found that the timeout is not actually 5 seconds but
> is just 0.3 seconds which would explain why I'm having problems as
> my gaps between PMTs are sometimes as long as 0.35 seconds.
> 
> The code in DVBChannel::Tune does 3000 iterations of the loop and
> sleeps for 100us on each pass which gives 300000us or 0.3 seconds.
> 
> I've just upped it to 30000 iterations to give a 3 second timeout
> and am rebuilding at the moment to see if that improves thing. It
> will probably take a few weeks before I'm really sure though as it
> doesn't fail very often.
> 
> Tom
> 
> --
> Tom Hughes (tom at compton.nu)
> http://www.compton.nu/
> 
> 
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> 


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