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

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