ripped DVD audio/video out of sync.

well, im finding out that some of the DVDs i ripped were out of sync with the audio and video. what causes that and how do you fix it. i had s free veersion of a DVD ripper that eneded up not working al though i did manage to ripp some DVDs. but now im finding its out of sync. im just trying to back up my bluray dvd collection. not successfull im afraid.:confused::(:(

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