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[walter---- <550100@xxxxxxxxxxxxxxxxxx>]

note: I have this issue in 4 computers; default settings of mythtv on ubuntu 12.04 and pulseaudio cause 'random' noise.  And random means it can start at any action you do; after a pause, switching to program guide, it can happen (about 15% chance).  
Another pause can fix it. 
My solution to stay with Pulse audio without changing pulseaudio default settings: 
in go to 'Advanced Audio Settings' on the audio Config Page.  
Here activate 'Override SRC audio quality Sample rate conversion' and select 'Disabled'
Also activate 'Force audio device output to 48kHz". 
The other option I kepped on the default settings. 

This worked on my 4 computers, all with  different hardware.

Walter

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https://bugs.launchpad.net/bugs/550100

Title:
  white noise or no sound after seeking when using PULSEAUDIO:default

Status in MythTV:
  Unknown
Status in “mythtv” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: mythtv

  I have an FE on my laptop. This laptop is also a generic desktop, so I
  want to use Pulseaudio so that I can get sounds, like chat events,
  etc...

  The FE is configured to use PULSEAUDIO:default.

  If I seek inside a normally playing recording, ffw or rwd, I lose
  proper audio, getting either white noise (raw digital data?) or no
  soundat all.

  Getting out of play mode and starting play again restores proper
  sound.

  Selecting an alternative audio channel and coming back to the default
  one while playing the recording also restores sound.

  Disregard the info on MythTV directory permissions, the bug was
  recorded on the remote FE not mounting anything

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: mythtv-frontend 0.23.0+fixes23820-0ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
  Uname: Linux 2.6.32-17-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sun Mar 28 09:18:33 2010
  EcryptfsInUse: Yes
  Installed_mythplugins-dbg: 0.0
  Installed_mythtv-dbg: 0.0
  MythTVDirectoryPermissions:
   total 16
   drwxrwsr-x 2 mythtv mythtv 4096 2010-03-25 06:40 music
   drwxrwxr-x 3 mythtv mythtv 4096 2010-01-26 21:37 pictures
   drwxr-xr-x 2 mythtv mythtv 4096 2008-11-06 22:02 recordings
   drwxr-xr-x 2 root   root   4096 2010-03-25 06:40 videos
  ProcEnviron:
   LANGUAGE=en_GB:en
   LANG=en_GB.utf8
   SHELL=/bin/bash
  SourcePackage: mythtv

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