Is it possible to cut commercials and save the video to the same file ?

[vigi_lante]

Since I don't have that much space, I would like to cut all the commercials and overwrite the video to the same file, instead of saving into a new one. Is it possible with VirtualDub ? Is there any other software that I could do that ?

[Manao]

No and no ( well, I can't be sure for the second part, but I don't think so )