1. It could be a bad video file, as you said before
2. It could be a bad audio decoder or your audio card is trying to use hardware acceleration for MP3.
3. Your CPU speed may be too slow and can't decode fast enough the streams.
So, can you provide more details so we can try to help you ? What CPU, wich audio\video decoder is used on those files, wich audio card do you use, does disabling hardware acceleration help ?
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