[mythtv-commits] Ticket #2226: Current SVN DVB-S zapping problems (diseqc?)

[MythTV]

#2226: Current SVN DVB-S zapping problems (diseqc?)
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 Reporter:  lukas.kasprowicz at online.de  |        Owner:  danielk
     Type:  defect                      |       Status:  new    
 Priority:  minor                       |    Milestone:  0.20   
Component:  mythtv                      |      Version:  head   
 Severity:  medium                      |   Resolution:         
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Comment (by yeasah at schwide.net):

 I attached a patch to help with flakey diseqc devices, but from the
 attached log it looks like this particular problem might be unrelated. My
 interpretation is that the first channel change to channel 898 is
 successful (which includes a diseqc switching, and is on 12480 V), at
 least to the point of receiving a correct-looking PAT, but the subsequent
 channel change to 12003 doesn't seem to get a signal lock. After that it
 changes back to 898 which is fine.

 * The channel change to 898 involves some diseqc operations (a switch),
 and it's successful.

 * Neither of the remaining channel changes involve any diseqc operations,
 since they all use the same switch position.

 * The diseqc switch isn't losing its position, because when channel 898 is
 tuned again it works fine without being told to switch.

 * The only thing different about the channel that doesn't work (from a
 tuning perspective) is that it has a different frequency, and voltage
 (polarity). Also the multiplex has a null field for the inversion setting
 (but that defaults to auto in that case), so that shouldn't matter.

 It looks to me like tuning is just plain failing here. Does it always fail
 on the same channels? Is it always channels on transports with a certain
 polarity or anything? Myth has had various retuning code enabled at
 various times (currently it doesn't have that), so maybe that was helping
 if for some reason tuning is flakey for this setup?

 Just some ideas. I think we can rule out diseqc as the source of the
 problem though.

 -yeasah

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Ticket URL: <http://svn.mythtv.org/trac/ticket/2226#comment:3>
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