I have used VideoRedo. Its full-featured free trial lasts 30 days. It is one of the few apps. that I have ever thought of buying. Look out for Tall Ship Cronicles on YouTube. That was originally one of my uploads from a set of NTSC VHS tapes, digitised to DVDs, then edited with Video Redo to remove gaps, ads., artefects, interference, etc., etc. Although the files got copied numerous times and my original work was forgotten.