The Grateful Dead Movie: According to The Hollywood Reporter, in the case of The Grateful Dead Movie, it's by restoring the negative and improving the sound for its DVD release, and adding a second disc of with 95 minutes of concert footage that didn't make the cut for the film's 1977 release.
Due November 9th via Monterey Video, The Grateful Dead Movie captures the band's legendary mid-October 1974 "farewell" concerts at San Francisco's Winterland. The project was taken up by frontman Jerry Garcia as the Dead prepared for a hiatus of undetermined length. Garcia worked on the film for more than two years with film editor Susan Crutcher.
The first disc boasts a high definition transfer of the film, restoring the full frame that was edited for its VHS release. Fans can choose from three audio selections: a Dolby Digital 5.1 version of original theatrical mix, as well as Dolby Digital 5.1 and Dolby Digital 2.0 mix from the master multi-track tapes.