[mythtv-commits] Ticket #6369: One channel stopped tuning in

[MythTV]

#6369: One channel stopped tuning in
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 Reporter:  jan at horde.org            |       Owner:  ijr       
     Type:  defect                   |      Status:  new       
 Priority:  major                    |   Milestone:  unknown   
Component:  MythTV - Video Playback  |     Version:  0.21-fixes
 Severity:  medium                   |     Mlocked:  0         
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 I have one single station that is not tuning in, and this only happens
 with MythTV.

 Long story:
 I have a TT C-2300 FF card for DVB-C. It works fine after solving the
 known frequencies issues with this card. No problems with QAM-256 either.
 Every transponder and every channel works fine. But one. I get a lock,
 PAT, and PMT but the screen stays black. No sound either. All other
 channels on the same transponder work fine. Tuning to this channel with
 mplayer works too. The backend log doesn't show any difference to the
 working channels.

 I'm running a weekly of 0.21-fixes.

 This seems to be an issue with this channel, another user reported a few
 days later, independently:
 I had a perfectly working mythTV DVB-C (Germany) installation until end of
 february. Out of a sudden, without me chaning anything, one single channel
 (ZDF) stopped working. It doesn't work in LiveTV mode any more, nor do any
 recordings I made on this channel. 2-week-old recordings from this channel
 which I kept, however, are still working.

 I figured out that, when recording something on this channel, recording
 works fine in the sense that the video data is recorded. The corresponding
 .mpg file stored on disk seems to be ok and plays perfectly when I
 manually play it with mplayer (also, it doesn't produce any errors,
 warnings or other unusual output when playing it with mplayer). BUT:
 mythTV can't play this recording! The preview icons both in mythfrontend
 and mythweb are just black (when they're created while displaying them the
 first time, the mythbackend process does something which causes load for
 several minutes but doesn't result in any debug output or a thumbnail
 icon). When trying to play the recording I just get a black screen and
 mythfrontend keeps printing "NVP: Prebuffer wait timed out 10 times." --
 just repeatedly this line, nothing more compared to the usual output.
 (When deinterlacing is disabled, mythfrontend stays reactive and playback
 can be cancelled using ESC; when deinterlacing is enabled however, I've to
 kill mythfrontend.)

 I just can't get the clue what's going on here. Old recordings from this
 channel reproducibly play and new ones don't. All other channels still
 work. I verified that the VID and service ID of that channel did not
 change. I also contacted the TV network and asked if they changed anything
 in the stream format or the stream headers. But they say that they didn't
 change anything lately.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/6369>
MythTV <http://www.mythtv.org/>
MythTV