the chapter file you'll have to make must look like this :
[Chapters]
1=00:00:00 chapter title
2=00:02:41 chapter title
3=00:16:32 chapter title
you can use chapterxtractor at
www.doom.org to extract this information from the ifo file.
after this you can use chapmaker to make the chapter picture available on the player ( find it at
www.gruntonline.fr.st )
but you can't keep the dvd menu with bsplayer...
you can extract the sound from the concert using DVD2Avi... this one can read vob file and save sound... ( find it at
www.doom9.org )
Hope it helps !
Matimott