^ ^ ^
I'm not ready to write off DVDLab yet -- not in the slightest, after the hell I've faced in authorizing (as many of us have.) I just had unexpected results that I haven't been able to resolve against the application yet.
For those who test the program, here's my situation: encoding was done with several different apps (LSX chiefly, within Premier and in independent applications), and burning was done through Adaptec (which was also used to burn a similar DVD-R disc through DVDit without problems.) DVDLab didn't touch most of the video, except to authorize it to the the disc format (one clip was assigned chapters, but this was an experimental codec test that didn't turn out.)
What I'm seeing in the DVDLab disc is a frame pause/pulse -- it looks like every key frame is being held, pausing the video for a milisecond every second or so. I haven't tested the disc on my PC DVD player (it's the most reliable video player I own), so I have some more tests and checks to do, but I didn't see these results outside of this app, so I can't recommend it unless I know that it wasn't this program creating the error.