Sound volume hoes up and down alot :)

This thing is only on some movies. Its quit anoying since its the whole movie every 2-3 seconds. I suppose its a bad codec?
Answer #1
it they are AC3 sound try a diff speaker setting, instead of 3-1 or whatever try a dolby setting
or visa-versa
Answer #2
Uninstalled my ac3filter version and downloaded the new one fixed the problem. Thank you!