[mythtv-commits] Ticket #9566: Mythbackend reports "multiplex is not available" and afterwards the specified DVB tuner is busy for ever

MythTV noreply at mythtv.org
Tue Apr 12 12:29:27 UTC 2011

#9566: Mythbackend reports "multiplex is not available" and afterwards the
specified DVB tuner is busy for ever
 Reporter:  Tomi Orava <tomi.orava@…>            |          Owner:  stuarta
     Type:  Bug Report                           |         Status:  new
 Priority:  minor                                |      Milestone:  unknown
Component:  MythTV - EIT                         |        Version:
 Severity:  medium                               |  0.24-fixes
 Keywords:  multiplex is not available           |     Resolution:
                                                 |  Ticket locked:  0

Comment (by mythtv@…):

 I would like to suggest an alternate cause of this issue: a race condition
 when attempting to simultaneously tune two tuners in one device. I have
 had similar issues over the past few months. Seeing this ticket, I
 disabled EIT by deselecting useonairguide for all my channels. I then
 tested by recording multiple programs with the same start time. One
 program didn't record, and MythTV had attempted to record it via a dual-
 tuner device.

 Next, I tested by setting multiple items to record, but setting the "Start
 Early" fields to make sure the start times weren't exactly the same. I
 only separated by a minute. This worked correctly. I also had a case where
 two MythTV attempted to tune two programs simultaneously, but using
 different devices. This also worked correctly.

 So, I suspect there is a race condition, either in the device (HD HomeRun
 with two tuners) or in MythTV. Would anyone with a different device with
 multiple tuners be able to try this experiment? That might narrow it down
 to my device or MythTV.

 I'm uploading a log for my recordings, along with version information. In
 the log, the first failure is Bones on April 7, right at the beginning of
 the log. Then on 4/11, after turning off EIT, I tried recording several
 shows at 1900. TMZ failed. I did more tests at 2100, just recording 5
 minutes at a time. However, since one program was already recording on the
 dual tuner, the other two streams were split between devices. Finally, at
 2330, I started recording TMZ again. At 2334 (2335 - Start Early==1), I
 started recording Letterman. At 2335 (Start Early == 0) I started
 recording Leno. All three recorded correctly.

 Full disclosure: I am a newbie to posting & fairly new to MythTV, so my
 apologies if I've made a mistake here. Also, my sample size is small. If
 you like, I can spend some time over the next few evenings to try this
 more. However, all the failed recordings in the previous months occurred
 when I had multiple programs with the same start time. I haven't scanned
 the logs to see if they were being sent to the same device though.

 First device: HD HomeRun, single tuner.[[BR]]
 Second device: HD HomeRun, dual tuner.[[BR]]
 Input: Terrestrial antenna.

Ticket URL: <http://code.mythtv.org/trac/ticket/9566#comment:3>
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