Re-editing a DVD

[Inertiac]

I have a homemade concert DVD..its a simple DVD, an hour and a half of video or so, and a simple menu that comes up with the button "play" (i didnt make this DVD. What i want to do is create my own menus, a root menu saying play and song selection, then a song selection menu. But to do this id need to create chapter in the video files.

Problem is so: The dvd is a ready to burn type thing. VIDEO_TS folder with a VIDEO_TS.ifo file, then VTS_01_0.ifo, VIDEO_TS.bup, VIDEO_TS.vob, VTS_01_0.bup, the vob files VTS_01_0 to VTS_01_5.

essentially its ready to burn but i want to reopen it, edit it to make better menus, then make it ready for burning again. How would i go about doing that? Do i have to decode the video and start from scratch with that video (so to speak)?

If its any help, this folder is about 4 megabyts, maybe 4.2 or 4.3. I have that concert footage seperate as a file about 1.2 megabytes, just as a .mpeg, so it makes sense to me taht the DVD quality would be better. But i dontknow. Id rather do it through the DVD files to be sure. I didnt make any of these files myself so i dont know exactly how they were created (codecs, sizes, etc), i just want to reauthor it.

[Turtle49]

You can extract the video/audio and use it to reauthor or if your authoring program supports it, you can just import from the Vob files. Either way your just using the existing video and adding a new menu, there should be no loss of quality.
Keep in mind you can' really "reopen it" you need to use the video and re-author.

Hope this helps

[Inertiac]

well id actually like to do this with several DVDs. so 2 questions:
1) what editing programs allow me to import straight from the vob files (if any) and create my own custom menus?
2) if i cant do that, i use flaskmpeg to encode into video, but i want the full quality of the DVD, so is it irrelevant how big the video file is? say it ends up being 3 gigabytes to get that DVD quality, that wont matter when recreating the DVD files (at least if i use DVDshrink if the files go over 4.3 or so). true? or should i go about encoding it into video a different way to keep that quality?

help or refferences much appreciated.