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.
In the world of DVDs, stands for Video Title Set . A single DVD can hold up to 99 title sets, which are essentially different sections of the disc like the main movie, "behind-the-scenes" features, or deleted scenes. VTS_26 : This refers to the 26th "Title Set" on the disc. VTS 26 1 mp4
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 Standard DVDs use the (Video Object) extension, which