有什麼剪接軟件可以食到”VOB”格式??

if the vob is on a dvd disc, that vob is probably encrypted
you can't edit an encrypted vob
you have to extract/rip that vob out from a dvd
then that vob will already have been decrypted
you might use dvd2vcd
http://home.netvigator.com/~allofus/dvd2vcd.pdf
for editing, you might use videoredo
http://www.videoredo.com
videoredo is good for the reason that it won't recompress the part of video selected for cutting, it just extract those frames out and therefore original quality of the video remains unchanged.
to use videoredo for 15-day trial, please be sure to click get free registration key from its HELP menu