[mythtv-commits] Ticket #4466: MythTV should disable tuner before switching inputs

[MythTV]

#4466: MythTV should disable tuner before switching inputs
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 Reporter:  starz909 at yahoo.com  |       Owner:  ijr    
     Type:  defect              |      Status:  new    
 Priority:  minor               |   Milestone:  0.21   
Component:  mythtv              |     Version:  unknown
 Severity:  medium              |     Mlocked:  0      
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 Hello,
 I came across this problem with the Hauppauge pvr-150 MCE card.  It may be
 reproducable with other ivtv cards, but I don't know.

 I have a standard analog TV lineup connected to the tuner of the pvr-150,
 and I have a digital cablebox source connected to the rear inputs of the
 card.  During livetv, if I want to switch to the cablebox, I'd switch the
 card's inputs.

   This switching doesn't work anymore because recent ivtv driver versions
 make it necessary to disable the tuner prior to actually issuing the
 command to switch inputs.  I verified this with a running mplayer and the
 v4l2-ctl utility.  The reason behind this change in driver behavior is to
 avoid corruption in the mpeg stream.

   I can't write patches, so I'm asking that Mythtv code be modified such
 that before mythtv changes from the tuner source to any other source, the
 tuner is disabled first.

   I know this is a hardware issue, but there is no sign that this driver
 change will be repealed.  Further, the changed driver has not yet made it
 into mainline kernel sources, so few people are coming across this
 problem.

 For further reference on the subject, please see:
 http://www.gossamer-threads.com/lists/mythtv/dev/308522
 http://www.gossamer-threads.com/lists/mythtv/users/304472
 http://www.gossamer-threads.com/lists/ivtv/devel/37242

 Best regards,
 Sam

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Ticket URL: <http://svn.mythtv.org/trac/ticket/4466>
MythTV <http://svn.mythtv.org/trac>
MythTV