You are much better of - jumping the DVD step - If You have the VHS tapes.
Then use a VHS-VCR-player and
• A/D-box - or -
• Camera with analog in and Digital out - to tape or via Video trough function (if it got this)
Then You omit the quality losing steps
• Converting to DVD (Costa a lot of Quality)
• Converting back to Digital (I prefere streamingDV .dv) - (Even worse Quality loss)
If You got no economical limit - then do as I (tough bite)
• Canopus ADVC-300 (now Grass Valley ADVC-300) as this both enhanze the pictura and mend minor error in the timecode = no halt and Aundi keeps in sync.
Yours Bengt W
Most probably (me wildly guessing) it occurs in two steps
• frame rate on Super 8 Projectors (Cameras) most often were 18fps (some Cameras can record in 24fps)
• then miniDV tape is either 25fps or 29.97fps - introduce drop down frames - most often in a bad way
• then if Your project is set in other fps e.g. miniDV (25fps PAL) and iMovie (29.97fps NTSC) - then even more artifact is introduced (same other way around - or even worse)
iMovie'08 to 11 - line discarding process
• when moving events to project - iMovie discard every second line in the picture resulting in even more quality loss
iMovie up to HD6 and FinalCut doesn't harm in that way.
So best possibly result is
Movie Scanner to Video editor without any in between steps and all set in proper frame rate (and as few conversions needed)
VHS to A/D-box to iMovie HD6 to iDVD - Give best possibly DVD to most of us.
Yours Bengt W