[mythtv-users] Yet another stutter thread

[Yippee Three-eight]

I'm getting stuttering with playback of some HD files.  Not all, but some.  SD plays fine, so do every .mp4 files I've tried and the one .mkv file I played.  However, liveTV that is HD stutters and .mpg (recorded shows) stutter if they are HD.
Using MythTV's Setup Wizard, the SD video test always runs fine.  The HD test always stutters.  I've tried every video profile available and they all stutter with HD, and all work fine on SD.  I get no sound on either test.  I'm not sure if that is right or not.  The sound test works fine.
One thing I noticed when doing the testing is that my audio reciever, when successfully playing and HD title, shows "PCM" during playback.  When I play an SD title, it shows "Dolby Digital".  When I play a problem HD title or live HD TV, it shows "Dolby Digital", then when it stutters it changes to "Decoder Off", then changes to "PCM" quickly, then it goes back to "Dolby Digital" until the next stutter.  So every time it stutters, it changes from "Dolby Digital" to "Decoder Off" to "PCM", then the stutter ends and it goes back to "Dolby Digital".
While the playback is stuttering, I am getting the following type of messages:2014-09-30 13:36:43.479086 N Player(0): Waited 103ms for video buffers AAAAdAAAAAAAAAThese waits are for anywhere from 102ms to about 310ms.
I noticed that when first playing one of these files, I got the following messages before the stuttering began:ALSA: Requested 500000us got 34133 buffer timeALSA: Try to manually increase audio buffer with:  echo 128 | sudo tee /proc/asound/card0/pcm7p/sub0/preallocALSA: No playback control PCM found on mixer device defaultALSA: Unable to open audio mixer. volume control disabledVDPAU: Added 2 output surfaces (total space 4, max space 4)Then it starts with the "Waited XXXms for video buffers _________________"
I tried running that command listed:  "echo 128 | sudo tee /proc/asound/card0/pcm7p/sub0/prealloc"It got rid of that message and the one before it, but didn't get rid of the ones following it (the two ALSA messages).
It also didn't change the "Waited XXXms" messages, nor did it stop the stuttering.
I thought, because of the messages and the receiver behavior that this might be a sound problem, so I looked at alsamixer.  In alsamixer I am only showing one PCM volume bar and 4 SPDIF channels.  I do not have the individual volume adjustments, but the only card available is, "0 NVIDIA....".
FWIW, I checked CPU usage, and it's consistently less than 10%.  I am running Mythbuntu 14.04.1, 64-bit, and my video output is over HDMI on my NVIDIA GTX 570 using NVIDIA drivers.
Any suggestions?
Mike
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.mythtv.org/pipermail/mythtv-users/attachments/20140930/6b72c3de/attachment-0001.html>