Comment 57 for bug 751265

Thanks for answer #23, it solved my problem.

The problem occured only by VLC itself and the KDE Phonon VLC module. So I suspect that VLC is doing something a little bit different than most other audio backends. Maybe the chunk size VLC uses or the timing of VLC.

Also I followed https://wiki.archlinux.org/index.php/PulseAudio#Choppy.2C_overdriven_sound (set samplerate to 48000 Hz) and https://wiki.archlinux.org/index.php/PulseAudio#Setting_the_default_fragment_number_and_buffer_size_in_Pulseaudio (Set correct buffer and fragment size for 48000 Hz). This alone without answer #23 was not enough, but I guess they are worthwhile anyway.

$ lspci | grep -i audio
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
01:05.1 Audio device: Advanced Micro Devices [AMD] nee ATI RS880 HDMI Audio [Radeon HD 4200 Series]