To obtain best video quality you need to keep original camera settings. Old VX, DVD system used to be NTSC or PAL interlaced footage. Some users deinterlace footage and instantaneously loose the 50% of the frames of the video. They have to do that because YouTube doesn't support interlaced footage. Just use the same camera settings (editing and exporting) to create the master/final video. With this master video do whatever you want, a dvd, a insta footage,... but keep this master video in the same format you recorded it. This must be done with all formats, new and old formats.
If you have an ISO DVD file and you want to convert it to .mp4 you must use Handbrake and follow this steps (follow image sequence)
https://www.skatehype.com/p/how-to-properly-create-interlaced-mp4-file-from-dvd/13005.htm
Topic: How to properly create a interlaced mp4 file from a DVD or any NTSC or PAL file. (Read 264 times)