avisync

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I'm using DVD::Rip and transcode to make avis from DVDs. The have always two sound-tracks.
Sometimes the second sound-track is out of sync. If I use avisync to correct this, the result
is very often unusable. Both sound-tracks are stuttering.
What I have to do is to de-multiplex the movie with  transcode -i movie.avi -P 1 -y raw,null -o video.avi
and with tcextract -i movie.avi -a 0 -x mp3 | tcextract -x mp3 -t raw > audio.mp3.
After this I have to multiplex the whole thing with avimerge and now I can successfully use avisync.
Why is this so complicated ? Why is it not possible to use avisync directly ?
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