[mythtv-users] Live TV video stuttering mainly before/during commercial breaks

Chris chris at bbzzdd.com
Thu Nov 22 23:03:48 UTC 2012


I have a very odd situation with my MythTV 0.26 Mythbuntu 12.04 install.
 Video is rock solid using VDPAU High Quality, card is an eVGA GeForce GTX
650 Ti.  However, often when going into commercial breaks, when commercials
switch, and going back to the program from commercial I often get
video/audio stuttering and the  PrebufferEnoughFrames message in the
frontend logs:

Nov 22 15:50:17 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 103ms for
video buffers AAAAAAALAAAfAA
Nov 22 15:50:26 dvr mythlogserver: mythfrontend[3442]: I CoreContext
mythpainter_ogl.cpp:62 (ClearCache) Clearing OpenGL painter cache.
Nov 22 15:56:30 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 102ms for
video buffers AAAAAfAAAALAAf
Nov 22 15:56:30 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 204ms for
video buffers AAAAAfAAAALAAf
Nov 22 15:56:30 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 305ms for
video buffers AAAAAfAAAALAAf
Nov 22 15:56:31 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 407ms for
video buffers AAAAAfAAAALAAf
Nov 22 15:56:31 dvr mythlogserver: mythfrontend[3442]: N CoreContext
mythplayer.cpp:2095 (PrebufferEnoughFrames) Player(5): Waited 509ms for
video buffers AAAAAfAAAALAAf

Again the program itself is almost always rock solid.  It seems like some
buffering occurs because the cable headend is switching streams
(my amateur assessment).

I am using a Silicon Dust hdhomerun currently but had the same issues with
the Hauppauge 2250 it replaced.  I am playing back ClearQAM video from Time
Warner Cable in NYC.

It does not seem to be CPU or disk related.  CPU is generally near idle
during video playback and video card barely breaks a sweat.  Pausing for a
second mitigates the issue but not a great long-term solution.  Using other
video profiles does not help and only seem to tax the CPU (Intel Q6600).

I've been Googling for solutions and trying just about everything for a
week now but nothing solves it.  Any advice/solutions greatly appreciated!
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