[mythtv] Backend hangs initializing channels

Thu Feb 17 12:36:18 UTC 2005

I tried with another soundcard, still the same behavior.
Now I tried with MythTV 0.16, 0.17, yesterday's CVS and ivtv 0.1, 
0.2rc3b-c-d-f, 0.3, and behaviours are always the same. Still, the 
PVR350 runs fine fine mplayer /dev/video...

At least, can anyone tell me what these "128000" stands for? And the 
"0[]:[]0" thats appears when the system succeeds...?

Thanks
Eric

Eric STEIMER wrote:
> OK sorry to disturb the dev ML. I already had a try on the user ML.
> Moreover this could possibly unveils a bug, as the behaviour has nothing 
> rational.
> 
> I was able to reproduce the same behaviours with late january CVS, 0.16, 
> and now I'm working with the sources of 0.17.
> My system is Debian pure64 (CPU is AMD64) with kernel 2.6.10, ivtv is 
> 0.2.0-rc3f (I also tried with 0.1 driver, 0.3 driver, and found nothing 
> usefull)
> 
> The description: basically, I'm *almost* able to get LiveTV working. 
> Most often, I can have it (everything fine with sound and channel 
> switching) after a cold boot.
> 
> Starting b/e then f/e in verbose mode gives the following :
> 
> 2005-02-16 04:18:56.079 Changing from None to WatchingLiveTV
> 2005-02-16 04:18:56.087 Using profile 'Live TV' to record
> 2005-02-16 04:18:56.088 Channel(/dev/video0)::CheckSignalFull(): input = 4
> 2005-02-16 04:18:56.116 2       ok
> 2005-02-16 04:18:56.148 135      []:[] []:[] []:[] []:[] []:[] 
> []:[]F2[]:[]/hom...
> 2005-02-16 04:18:57.098 6       128000
> 2005-02-16 04:18:57.103 7       0[]:[]0
> 2005-02-16 04:18:57.111 6       128000
> 2005-02-16 04:18:57.301 6       128000
> 2005-02-16 04:18:57.446 6       128000
> 2005-02-16 04:18:57.662 6       128000
> 2005-02-16 04:18:57.792 6       128000
> 2005-02-16 04:18:57.925 6       128000
> 2005-02-16 04:18:58.132 6       128000
> 2005-02-16 04:18:58.262 6       128000
> 2005-02-16 04:18:58.268 8       0[]:[]34
> 2005-02-16 04:18:58.278 78 
> 0[]:[]0[]:[]0[]:[]38[]:[]0[]:[]1[]:[]0[]:[]3441...
> 2005-02-16 04:18:58.406 6       128000
> 2005-02-16 04:18:58.464 1       1
> 2005-02-16 04:18:58.471 1       1
> 2005-02-16 04:18:58.478 2       25
> 2005-02-16 04:18:58.485 7       Tuner 0
> 2005-02-16 04:18:58.492 2       ok
> 2005-02-16 04:18:58.596 8       0[]:[]41
> 2005-02-16 04:18:58.601 25      0[]:[]3[]:[]0[]:[]1130534
> 2005-02-16 04:18:58.618 6       128000
> 2005-02-16 04:18:58.742 6       128000
> 2005-02-16 04:18:58.886 6       128000
> 2005-02-16 04:18:59.019 6       128000
> 
> And frontend seems to do its job.
> 
> --> Now when the strange behaviour occurs, starting LiveTV gets nothing 
> but a black screen. Still, my logs gets filled by ivtv so I guess the 
> system is using it.
> 
> In that case, the backend verbose is a bit different. It looks like this:
> 
> 2005-02-16 04:23:51.914 Changing from None to WatchingLiveTV
> 2005-02-16 04:23:51.927 Using profile 'Live TV' to record
> 2005-02-16 04:23:51.928 Channel(/dev/video0)::CheckSignalFull(): input = 4
> 2005-02-16 04:23:51.960 2       ok
> 2005-02-16 04:23:51.992 135      []:[] []:[] []:[] []:[] []:[] 
> []:[]F2[]:[]/hom...
> 2005-02-16 04:23:52.936 6       128000
> 2005-02-16 04:23:53.140 6       128000
> 2005-02-16 04:23:53.284 6       128000
> 2005-02-16 04:23:53.489 6       128000
> 2005-02-16 04:23:53.619 6       128000
> 2005-02-16 04:23:53.764 6       128000
> 2005-02-16 04:23:53.896 6       128000
> 2005-02-16 04:23:54.089 6       128000
> 2005-02-16 04:23:54.218 6       128000
> 2005-02-16 04:23:54.376 6       128000
> 2005-02-16 04:23:54.570 6       128000
> 2005-02-16 04:23:54.698 6       128000
> 2005-02-16 04:23:54.856 6       128000
> 2005-02-16 04:23:55.051 6       128000
> 2005-02-16 04:23:55.168 6       128000
> 2005-02-16 04:23:55.300 6       128000
> 2005-02-16 04:23:55.457 6       128000
> 2005-02-16 04:23:55.648 6       128000
> 2005-02-16 04:23:55.780 6       128000
> 2005-02-16 04:23:55.936 6       128000
> 
> Then NOTHING more. It seems to hang. Well actually it does not 
> completely as I can see the QueueJob messages every minutes.
> 
> Notice the difference between the OK and the noOK : mythbackend does not 
> show such line as
> 
> 2005-02-16 04:18:58.478 2       25
> 2005-02-16 04:18:58.485 7       Tuner 0
> 2005-02-16 04:18:58.492 2       ok
> 2005-02-16 04:18:58.596 8       0[]:[]41
> 2005-02-16 04:18:58.601 25      0[]:[]3[]:[]0[]:[]1130534
> 
> when it fails. I guess it struggles to initialize tuning the channel... or?
> 
> Exiting b/e end f/e then starting mplayer /dev/video shows the correct 
> LiveTV.
> 
> I don't know if this relies on the amd64 architecture. I found no other 
> topic describing the same issue. Now after more that a week hunting the 
> bug (or is it?), I'm out of clue.
> 
> Can anyone give me some new direction to look at?
> 
> 
> PS : I may add that unfortunately I was totally unable to catch any 
> difference in the system use between OK and noOK. It's really "sometimes 
> if works, sometimes it doesn't" :-/
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