So you’re recording your film with your coolpix from a television or monitor? What is your player - is there a video and audio output? With a TV card on your computer or video digitizer, you can record with Shotcut in real time without loss.
Oh sorry, now I know the Super8-Thing! I thought it would be an 8mm-Tape Camcorder!
The only way to prevent the ‘rolling stripes’ is to record analog film with an optical lens adapter on a digital recorder so that I can digitally edit it as described above. That’s how my great-uncle always did it.