Superbit DVD: Better sound and picture quality

These are DVDs that devote the entire data capacity to accommodate higher video bit rates and two surround sound options, DTS 5.1 & Dolby Digital 5.1.  Extra disc space is freed by omitting bonus materials, running audio commentaries, other audio or/and language tracks.  The removed extras yield:  (a) higher video bit rate, (b) DTS 5.1, (c) Dolby Digital 5.1 surround sound tracks.  (You can play these discs in the standard DVD player.)