Edited video using Vegas is Blocky after render.

[johnnysc]

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?

[Blazey]

Maybe...

Load a clip in TMPGEnc and see what it says regarding FIELD ORDER.

When you output MPEG2 in Vegas, choose progressive source and MATCH the field order of TMPGEnc. Chances are that the MC encoder is backwards as that is factory default.

[johnnysc]

I already do that because when the field order is mixed up i was getting shaky video the entire time. This is something different. I'm not sure if it has to do with field order. I was on another forum and someone suggested maybe it was a frame rate difference. I checked that out and some clips were only 25 fps compared to my vegas setting of 29.97 but some of those ones that were 25fps rendered fine where others didnt. I was thinking of this. I download the clips as mpeg2 (svcd). Is it possible that i can play the file fine because wmp uses the correct codec to play it. Is it possible there is some sort of conflict with the codecs vegas uses and the codec that was used when the person orifinally rendered it? Its a shot in the dark......