9 days this has taken me but finally I think I have it as non jerky as its ever going to get.
programs used
Vegas 5.0
virtual dub 1.5.10.1
motionperfect
slowmotion
avisynth 2.6
the second half of this shot, ie the first half of the SE CGI shot was run through SLOWMOTION at 1.5x slow.
the first half was a frigging nightmare but I think I have finall cracked it.
step 1. avisynth script to convert framerate to 150fps
step 2. run it motionperfect so that it plays back at 135% the run time of the original shot, ie one third longer but keeping 150fps
step 3. avisynth script to convert framerate down to 50fps
step 4. run this avisynth script through virtual dub to decimate every other frame so we end up with a 25fps file to be inserted back into vegas.
the variations I have tried have been unbeleivable. I've done 100fps, 75fps, 33fps etc ad nauseum but I think I have now got it to a level that I am happy with it.
final flyby version (I hope)
enjoy, critique please. I think this works with wipes. but what do people think. BTW, regardless of what people say, I will be doing the fade between the control room and the first part of the flyby.