Recently I captured a 10 min segment of music video's all from the same feed and out of the three clips that I captured only one was out of sync. I'm wondering if anyone has encountered this and if so, why would one clip differ from the previous two music vids.

I captured the segment using VirtualDub and yes, I had the audio and video locked together but I'm curious as to why it occured.

Out of all three clips in the 10 minute segment I'll be editing and saving the out of sync clip only and have adjusted the interleaving in V-Dub to -200ms which worked in restoring perfect sync.