DVD video file format :
DVD (also known as "Digital Versatile Disc" or "Digital Video Disc") is a popular optical disc storage media format. Its main uses are video and data storage. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six times as much data.
DVD-Video discs respectively refer to properly formatted and structured video content. It uses MPEG-2 for video compression, with AC-3, DTS or MPEG audio for multi-channel audio support.
Best way to cut/trim/split DVD file :
GiliSoft DVD Ripper — Cut/trim/split DVD file.
1) Launch GiliSoft DVD Ripper
Once installed GiliSoft DVD Ripper, Launch GiliSoft DVD Ripper.
2) Load File
Click 'Add File(s)' button, Click 'Open DVD' to select your DVD Video disc.
Add your DVD disc, GiliSoft DVD Ripper will preview your DVD file directly.
3) Select video and click 'Cut' button to set Start time, and End time.
4) Click 'Start' button to start to cut your DVD.
GiliSoft DVD Ripper Rip DVD to AVI, MPEG, WMV, DivX, MP4, H.264/AVC and extract audio from DVD as MP3, WMA, WAV, etc.