Help with video in vegas!

[FlySky]

Well I needed to use an .avi video in Sony Vegas 6, but when I clicked to add it to the timeline, the video did not run smoothly at all, it kept jumping.

Well I checked out what the exact details of the video were on a program and it says that the video is:

Codec: XVID
Name: XviD 1.0.3

Just to say, im ONLY having problems with the video running slowly, not the audio.

Anyone know how to make the video run more smoothly, any help appreciated!

[The Origonal Head Hunter]

That is a link. Read and reread, then ask questions.

[SenTrix]

Open your video in Vdub via AVIsynth, then use lagarith or huffy codecs to render out clips u want.