DVD Decrypter: getting high pitch sounds

I am using DVD Decrypter to extract audio tracks from a DVD.


It worked fine, but I am getting occasionally some strange high pitch signals like creak, short as scratches on old vinyl disks but loud and acute. Usually I get 1 to 10 of those “scratches” on each track.

By mistake I did not select “Demux” the very first time and found that created VOB files did not have this problem. However when I use “Demux” the generated ac3 files have this problem and next time these problems are at exactly same locations. I need ac3 in order to use in Nero.

Is there anything I can do to fix this problem?

Thank you