[mythtv-commits] Ticket #12759: VBox channel scan ignores HD channels with transmission type S2

[MythTV]

#12759: VBox channel scan ignores HD channels with transmission type S2
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 Reporter:  karl@…                    |          Owner:
     Type:  Bug Report - General      |         Status:  closed
 Priority:  minor                     |      Milestone:  0.28.1
Component:  MythTV - Channel Scanner  |        Version:  Master Head
 Severity:  medium                    |     Resolution:  Fixed
 Keywords:  vbox                      |  Ticket locked:  0
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Changes (by paulh):

 * status:  infoneeded_new => closed
 * resolution:   => Fixed
 * milestone:  unknown => 0.28.1


Comment:

 Replying to [comment:11 karl@…]:
 > That code update worked and I can now scan and view all HD channels.
 >

 Ok thanks for testing I will close this ticket as fixed. Please open
 separate tickets for any further problems.

 > Myth doesn't know that S2 channels are only available on the S2 tuner so
 will attempt (and fail) to tune an S2 channel on the S tuner if the S2
 tuner is busy.
 >

 Ok a couple of things to note :-

 1. Myth assumes it has exclusive access to any capture devices, that
 applies to all devices not just VBoxes so if another client is streaming
 from the VBox Myth doesn't know or care it assumes it has exclusive
 access. The VBox API does allow us to query what is being streamed and
 could in theory work around the problem by using other tuners or notifying
 the user it can't switch to a channel because the tuner is in use but I
 don't think there is anything in Myth to handle this sort of thing yet.

 2. If it's not a problem with other clients using a tuner then it could be
 a setup problem. The XTi-3340 like you say has 4 tuners total (2 x T, 1 x
 S2 and 1 x S) For Myth to be able to use those tuners it would require 3
 video sources being set up. That is because there are 3 different sets of
 channels that can be received (The DVB-T tuners can get one set, the DVB-S
 can get another and finally the DVB-S2 tuner can get another). If you
 attach the correct video source to the various tuners and do a channel
 scan for each source then if everything is working as it should Myth
 should only add the channels that each tuner can tune to that video
 source. You can verify this is working by going to the channel editor and
 switch the video source on there to filter the channel list.

 > Watching Live TV and switching between T and S tuners will crash the
 backend within a few channel changes (starting channels are correct in
 mythtv-setup), but these are different problems - original HD scan problem
 is fixed - thanks!

 If you can open a ticket preferably with a backtrace of the crash someone
 will take a look. I suspect this is a problem with IP streaming playback
 in general and isn't VBox related.

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Ticket URL: <https://code.mythtv.org/trac/ticket/12759#comment:12>
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