David, thanks for your quick response. I think I can shed some light on 
this issue. I solved the problem by going into VLC > Tools > Preferences 
 > Audio. I changed the Output module from the default (Pulseaudio, I 
assume) to ALSA and the distortion went away. While playing VLC, this 
change shows in the taskbar sound manager in Preferences > Applications. 
Instead of saying "VLC media player", it now says "ALSA plug-in [vlc]". 
VLC doesn't seem to like Pulseaudio on my machine with my card at least, 
and, of course, the VLC folks recommend disabling Pulseaudio. Not sure 
where you want to go fromhere, especially if it isn't affecting a lot of 
people.
Thanks, Blaine
Incidentally, I did not have to do this with VLC 1.1.4 in Maverick. Not 
sure why it became necessary.


On 04/05/2011 07:29 AM, David Henningsson wrote:
> Hi Blaine and thanks for your bug report. I tried vlc here but could not
> reproduce it, and I'm not sure what could be causing it. If you feel
> like investigating further, here are some possible ideas:
>
> 1) Construct a PulseAudio log and see if it says anything about it: 
> https://wiki.ubuntu.com/PulseAudio/Log
> 2) Do the same thing but add PULSE_NO_SIMD=1 on the command line in front of 
> the command that starts pulseaudio, and see if that helps
> 3) Try to create an audio sample by capturing the monitoring stream and see 
> if the hiss is present there, if so, attach the resulting wave file here.
>

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https://bugs.launchpad.net/bugs/751265

Title:
  pulseaudio distorts VLC audio

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