Yes I know what you mean, it happened to me both on youtube and just on Windows Media Player. I am suggesting that different settings may solve the problem. And because Sony Vegas have so many different settings, it's easier to look up the best settings for uploading to YouTube (since I assume that's what you want to do with the video in the end) and try those settings. For one, you might be able to fix your problem and two, you will also have optimum settings for YouTube which is great for file size/quality/etc and three, you don't have to keep trying different settings since that'll be time consuming. xD
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