No matter what video you want to edit, the format matters for the editor that you use.

Even though VLC claims to be able to convert from one format to another, I have been unsuccessful in trying to convert a MPG file to a MOV format. It saves the converted file with the same filename and extension (overwriting the original unless you choose a different folder) and it appears to be corrupted.

If you have a DVD movie that you want to edit, you’ll first have to use an app like Handbrake or Wondershare to rip the movie into a single video file that can then be edited.

Handbrake: https://handbrake.fr/downloads.php

Wondershare: https://videoconverter.wondershare.net/ad/wondershare-dvd-converter-ultimate.html

You can convert any video format to any other video format online for free:

https://www.files-conversion.com/

Select MOV as the file type to convert to, and select the highest quality to ensure that the video will not look funny when viewed.Once the file is converted, you have to view the file. While viewing the file, right click on it to save the file to your computer (save to the same folder as the original).

QuickTime Player is for quick trimming, splitting, and combining video clips. It might be faster to trim the movie in QuickTime before doing more advanced editing in iMovie. Macmost has a good tutorial using QuickTime to edit a video here:

https://www.youtube.com/watch?v=W7NrlhZin4M

iMovie lets you control more aspects of the video, such as sound, transitions, overlays, picture-in-picture and much more. Here’s a great tutorial for using iMovie in iOS:

https://www.youtube.com/watch?v=a7sjT_BySf8

But be sure to check out the new features in iMovie in iOS 13 here:

https://www.youtube.com/watch?v=Zm6PAPeZaWg

John R Carter, Sr.