Here is what happened with me:

Adjusting default-fragments and default-fragment-size-msec in
/etc/pulse/daemon.conf did not work so afterwards I set them back to the
original 8 and 10 respectively.

My in /etc/pulse/default.pa  already had  load-module module-hal-detect
tsched=0

So I uncommented the line: #load-module module-alsa-sink 
and made it load-module module-alsa-sink tsched=0

Then went ahead to change default-fragment-size-msec 25 in 
/etc/pulse/daemon.conf
The sound then started working but it was working and then the video picture 
was not moving along, it just stayed in one spot or kept jumping, so I figured 
the original values were best. When I reloaded the videos then I had to go to 
volume controls and reduce the master front video and increase the PCM. That 
cut out the crackling.

So I went back and again commented #load-module module-alsa-sink
tsched=0. It still worked!


So for me the real solution was bringing down master front and increasing PCM 
on volume controls

-- 
Crackling noise after update to pulseaudio
https://bugs.launchpad.net/bugs/301755
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