Fantastic. That works brilliantly. I have my video re-timed and the audio works with it too. Side by side in different programs, the two clips very roughly synchronise. StackHorizontal also works a treat and Trim makes them start at the same time. However.....

Question 3

Using StackHorizontal, clip1 runs at the correct length but clip2 now runs 6 minutes longer. I have tried various inputs to set it to the original 29fps for clip2 but with no luck. Here is the script. Any advice??

clip1=AVISource("LD.avi").Trim(310,0).AssumeFPS(28.2907, true)

clip2=AVISource("vhs.avi").Trim(200,0)

StackHorizontal(clip1, clip2)

Question 4

Is there a way to pause or add blank frames to either clip1 or clip2 throughout the film to allow the other clip to "catch up". With both files running side by side in different programs, the video syncs fairly well then drops out of sync at the end of certain scenes.

I assume I need to have the frame numbers for each file on screen and write some sort of pause or add script at certain frame numbers. I expect to need dozens of these and be able to do it to either clip.

Thanks again......