Video Stutters, Freezes, Gaps, and Silence (QT conversions)

I've been having trouble with some videos on my iPod and my computer. On certain files, so far on those more TV show length or more, about every 30 secs the video freezes for a bit, then continues but without audio. This has happened only on the iPod, in iTunes they might barely freeze but audio continues with video normally and mostly with non-iTunes videos, mostly encoded in QT. Another problem I've been having is that MPEGs and AVIs downloaded on computer have no audio track according to QT but when played the audio workes fine. Obviously the converted video doesn't have the audio either. Both these issues have a been a major concern and annoyance, though I'm not sure how much is the iPods fault or QT's. I'm thinking the stutter is due to coflicting format, maybe corruption, or inferior tech on the iPod. Thanks.

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