[mythtv-commits] Ticket #9344: Playback stuttering under 0.24 when playing h264 material with VDPAU

[MythTV]

#9344: Playback stuttering under 0.24 when playing h264 material with VDPAU
---------------------------------------+--------------------------
 Reporter:  enigma@…                   |          Owner:  markk
     Type:  Bug Report                 |         Status:  accepted
 Priority:  minor                      |      Milestone:  unknown
Component:  MythTV - Video Playback    |        Version:  0.24
 Severity:  medium                     |     Resolution:
 Keywords:                             |  Ticket locked:  0
---------------------------------------+--------------------------

Comment (by markk):

 Can you confirm what Qt version you are using (mythfrontend --version).

 The linked clip plays without a problem here using the same card and
 driver version. The cpu is more powerful, so I also tested on my ion
 frontend that has a similar driver version and, again, it plays smoothly.

 I'm pretty confident that this isn't a VDPAU issue, not least because the
 VDPAU video code barely changed between 0.23 and 0.24.

 A lot of the other video playback code has however changed in that time,
 as well as many other mythfrontend and mythbackend behaviours, any of
 which has probably changed the demands placed on the system.

 The most 'interesting' thing in the log is that playback is fine for 20
 seconds or so before starting to go wrong. This strongly suggests that
 either the CPU or GPU is settling down to a lower performance level after
 the initial 'hit' from starting to play the file. Almost every other
 problem (audio, decoder performance, network issue etc) would give you
 playback problems right from the start.

 The only other thing that springs to mind is that you have a single core
 CPU, which may not be handling the threading too well (but I see at least
 one other person with the same problem who is not running a single core
 machine)

 So, a couple more requests:-
 - can you grab a couple of other playback logs and confirm the same trend
 - starts fine, then breaks.
 - please double check your system setup and logs and see if there is
 anything that might indicate what changes 20 seconds into the video.

 thanks, Mark

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/9344#comment:7>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center