Firefox and pulseaudio

[szzsqing1]

ALSA bug in Knoppix 8: MPlayer, mpv (SMPlayer, GNOME MPlayer): after some minutes of play (about 3 minutes) the sound begins to crackle for about 10 seconds. And this happens again and again... Experienced with two different types of Dell notebook. The bug is like described here: https://bugs.archlinux.org/task/41075
And the sound bug is like this: http://njoliat.the-nsa.org/alsa_plug...ug_crackle.wav
I tried to resolve the problem by changing the audio device to oss, sdl but this did not help since with them there are other problems...

VLC's sound is OK, but I would prefer MPlayer, mpv. How to fix this? Please give a solution.