I am using:
Vegas 6
bbmpeg [to convert .avi to mpeg2]
dvd authorGUI
Sonic RecordNow

the problem:
a 4 minute film at 3.5 minutes the image gets jumpy/jerky. basically the sound is no longer synced with image.

my research:
I have checked this forum and talked to many people who tell me to render out my files from vegas into one video and two audio as well as do ‘elemental’ rather than muxing.

my questions:
could this be due to filters/editing I have done at that point in the film? The file is completely fine as an mpeg2—what could be causing it to happen in the authoring? How exactly do I do it as ‘elemental’? [and what is ‘elemental’ vs. ‘muxing’?]

if this info is out there somewhere already can someone direct me to it?

much grass to all.