[mythtv-commits] Ticket #2355: Loss of A/V sync in playback with standard decoder

[MythTV]

#2355: Loss of A/V sync in playback with standard decoder
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 Reporter:  bhuffman at graze.net  |        Owner:  ijr    
     Type:  defect              |       Status:  new    
 Priority:  minor               |    Milestone:  unknown
Component:  mythtv              |      Version:         
 Severity:  medium              |   Resolution:         
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Comment (by bhuffman at graze.net):

 I can't find a revision where this works.  I've gone all the way back to
 revision 9875 (early May) and still have this problem.  Honestly, I can't
 remember if I've ever successfully used the Internal playback for Video.
 I know that it's worked for DVDs.  As far as standard recordings, I don't
 see this - perhaps it's only happening on progressive recordings?  All of
 my TV recordings are interlaced (ivtv capture via svideo).

 Anyway - here's a little more info: It seems like there's always some
 initial "glitch" that throws off the sync.  Or in the case of one DVD that
 I have (Madagasgar), it can't seem to ever quite get in sync.  But with
 the standard decoder on my system, once it's out of sync, it can't seem to
 get back in.  I just keep getting "Write Audio: buffer underrun" messages.
 If I do a quick fast forward and then play again, that fixes it (at least
 temporarily - I haven't watched for long).

 Using libmpeg2 in all cases that I've tested at least allow the decoder to
 get back in sync.  I still see small glitches in some of my ripped DVDs (I
 see a message about SUBTITLES in the output of mythfrontend right before
 this glitch - is it something with DVDNAV packets?), but libmpeg2 seems to
 be able to re-sync the audio and video after this glitch where the
 standard decoder can not.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/2355#comment:2>
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