ok - here is the full story:
first i rip the vob-files with smartripper and extract the ac3-stream with vstrip -> with only the demux-function activated and only one ac3-substream selected. then i start dds azid/lame GUI [v 0.3] and encode the ac3-stream into wav-format [azid v1.7.1]. the only activated functions are: LFE to LR channels: -3db; dynamic compression: normal; auto find maximum gain; print current settings/Bitstream information/Downmix matrix; Quit on Bitstream Error. i later encode the file to mp3, but the errors occure in the wav-file too, so it can't be lame that causes the problem, also it can't be vstrip, because when i encode the ac3-file without the use of the dynamic compression, there aren't any errors in the output.
i hope this info is enough, if you need more, plz ask me again
!