I am working on a project and i'm having trouble figuring out whats going on. I have various clips from different sources, some i capture some are given to me and some are downloaded. The ones i capture are fine and nothing is wrong with them. The problem is with the ones i downloaded. When playing these videos in media player or even in the preview window of vegas they play fine, no problem. However, when i edit the clips and render them through vegas video some (not all) get blocky every few seconds. The video will be normal then its gets blocky for a half a second then goes back to normal. I've tried everything, rendering in different formats (avi, wmv, mpg2) i tried anything just to see what was wrong. Now what does work is if i take the entire clip downloaded and then run it through tmpgenc and rerender it. When i then cut it and edit it in vegas and render it out its fine. I hate going and doing that through tmpgenc. Anyone have any ideas on whats goin on?