I have stream processed 4 titles on a DVD. I now have four sets of VOB files. DVDdecrypter has this text as the log file:

0x80 - Audio - AC3 / 2ch / 48kHz / DRC / English / LBA: 60 / PTS: 00:00:01.829 / Delay: -98ms
0xE0 - Video - MPEG-2 / 720x480 (NTSC) / 4:3 / LBA: 2 / PTS: 00:00:01.928 / Delay: 0ms

I was told I could simply change the VOB extension to *.mpg and then add it to an authoring program. (It seems many programs do not directly import VOB files) should I rename the VOB files to *.m2p or *.mpg ? (I don't know what the difference between these ext's are)

The delay shows -98ms that seems small, is that your opinion of this? is it normal to have some delay when doing this?

anyway, what I like to do is in the long-run is combine these 4 titles into 1 single title with new added chapters.

THANKS!!