[mythtv-commits] Ticket #9344: Playback stuttering under 0.24 when playing h264 material with VDPAU
MythTV
noreply at mythtv.org
Thu Dec 9 09:41:41 UTC 2010
#9344: Playback stuttering under 0.24 when playing h264 material with VDPAU
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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
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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
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Ticket URL: <http://code.mythtv.org/trac/ticket/9344#comment:7>
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