[mythtv-commits] Ticket #9954: Bad channel crash loop - Problem since v 0.18

[MythTV]

#9954: Bad channel crash loop - Problem since v 0.18
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 Reporter:  al5121024@…               |          Owner:
     Type:  Bug Report - General      |         Status:  infoneeded_new
 Priority:  minor                     |      Milestone:  unknown
Component:  MythTV - General          |        Version:  Unspecified
 Severity:  medium                    |     Resolution:
 Keywords:  channel starting channel  |  Ticket locked:  0
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Comment (by al5121024@…):

 @mdean

 It's more complicated than that. There is one serious problem, compounded
 by a minor problem that I just found out about and have not previously
 reported. The more I experiment, the more quirks I find. My initial ticket
 was wrong about the cause of the serious problem. I incorrectly thought it
 was caused by the digital tuner going from good channel 171 to bad channel
 174 (for example) and then "watch TV" trying to tune to bad channel 174
 ever after. Instead mythtv tunes to 171, which has gone bad, corrupted by
 the previous attempt to tune to 174.

 So the serious problem is that once the digital tuner has been on certain
 bad channels, all digital tuner channels (even on a second digital input)
 are bad.

 The "can't change from SD to HD" is a red herring. First, it isn't SD to
 HD, since some digital channels are broadcast in SD. It is analog to
 digital. Second, it isn't changing from analog to digital that's the
 problem. Its that all digital channels have gone bad.

 Examples are the best way to show this:

 Channel 777 is good digital
 Channel 1313 is bad digital
 Channel 2 is analog

 Example 1) Start on channel 777. Change to 1313=crash to menu. "Watch TV"
 takes you directly to 777, but now 777=crash to menu.

 Example 2) Start on channel 2. Change to 1313=crash to menu. "Watch TV"
 takes you directly to 2, which still works, but all digital channels are
 now bad.

 It's not going from analog to digital that kills it, its just that
 starting over at analog is the only way to avoid instakill by the bad
 digital channel.

 The only reason it looks like going from analog to digital kills it is
 that analog is the only safe place once digital goes Hal9000 on you.

 Not all bad channels trigger "all bad". At least one crashes-to-menu but
 doesn't have further results. That one has content that can be recorded
 but not watched on live tv. At least one of the really bad channels can't
 be recorded.

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/9954#comment:7>
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