Standard DVDs use the (Video Object) extension, which is based on MPEG-2 compression. If your file ends in .mp4 , it has likely been "ripped" or converted from the original disc.
If you have the original DVD files (VOB) and need to turn them into a more usable MP4, here are the most reliable tools: Inside DVD-Video/Directory Structure - Wikibooks VTS 26 1 mp4
MP4 is the modern gold standard for video because it is supported by almost every device, from iPhones to Androids and smart TVs. Unlike older DVD formats, MP4 files are easier to share, stream, and store in smaller file sizes without losing significant quality. How to Play or Convert These Files Standard DVDs use the (Video Object) extension, which