Reproducible for me with a

00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 02)

sound chip (ASUS P5B onboard sound).

Actually the problem seems to be a little more complex, though.
Apparently the outcome depends on what audio driver is set as system
default. For me, forcing VLC to "ALSA" would cut  the crackling.
However, it did turn out, that when forcing the default system audio
drivers to ALSA (apparently, the default setting is OSS for the above
mentioned soundchip), this would change, so forcing VLC to OSS did the
trick. Leaving the audio to "Default" in VLC does always produce
crackling noises  (if volume is set to >50%). Note that after changing
the default audio driver, you'll have to save settings in VLC again
(even when not changing anything)  and restart it, as otherwhise the
described behaviour is not reproducible (for me at least). Also, the VLC
audio settings might jump back to Default after changing system
defaults.

-- 
(Feisty) VLC sound quality is poor for many video files
https://bugs.launchpad.net/bugs/103025
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