[mythtv-commits] Ticket #6456: DVD Playback stutters

[MythTV]

#6456: DVD Playback stutters
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 Reporter:  alan at eng.com           |        Owner:  skamithi      
     Type:  defect                 |       Status:  infoneeded_new
 Priority:  major                  |    Milestone:  unknown       
Component:  MythTV - DVD Playback  |      Version:  0.21-fixes    
 Severity:  high                   |   Resolution:                
  Mlocked:  0                      |  
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Comment(by alan at eng.com):

 After a little wrestling I was able to get 0.21+trunk20931 (from Mythbuntu
 repositories), running - I created a local master backend, so eliminating
 all the old settings.  Animusic 2, the DVD I use for testing, seg faults
 as soon as it exits the main menu and tries to play the actual DVD, i.e.
 press play, watch the outro, and as soon as it switches to the first
 "scene", mythfrontend exits and seg faults.  The menu stuttered as badly
 as it does with 0.21+fixes.  And as with 0.21 fixes, it plays smoothly
 second time around on every frame shown previously, and then stutters
 again on new frames - as if the data is held in a buffer.  Playing another
 disc, then re-inserting Animusic gets back to the stuttering.  For
 clarity, when I say stuttering, I mean the image jumps as if skipping a
 number of frames or pausing between frames, the audio is fine.  I was
 unable to jump to a scene from the main menu either - again as soon as a
 scene is supposed to play, Myth seg faults.

 I tried Gladiator - and while that played, it too stuttered - nowhere near
 as bad as Animusic, but then it never was as bad previously either.

 I also tried Wall-E, the menus still don't work properly there - once I
 select play, it gets stuck looping between the FBI warnings and a
 disclaimer (which whips passed to fast for me to read).  Selecting scene
 selection and choosing the first scene starts it up OK.  However there is
 still stuttering on this DVD as well.

 I tested all three DVDs with Xine and Totem (Gstreamer), both handled the
 menus and play back fine - Totem had a few issues with Wall-E's menu, but
 more being very slow, rather than not functioning.  There was no
 stuttering or playback issues with either.

 It seems to be a bandwidth issue, as Animusic reputedly uses every
 available mbps of the DVD format, and on other DVDs, while major scene
 changes are often handled well, panning and lots of action seem to trigger
 the stuttering behavior as well.

 Any ideas - anything else to check?

 Thanks for the support - I appreciate it.  I've been using MythTV since
 0.11 (I think - Sept 03 at least), and each step forward is well worth it
 - I'd really like to nail this problem, because when it works the DVD
 playback is great.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/6456#comment:7>
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