The video tape is scanned to identify scene changes, insert pan and scan
codes (not in any DVDs I buy), enter closed captioning information and optionally mark
scenes for exclusion by means of parental lockout in inclusion for DVDs with alternate
versions or ratings available.
The video is then compressed by MPEG-2 formatting by a technique called variable
bit rate encoding.
The audio tracks are then compressed and encoded by one or more of
several means available. This permits the inclusion of surround sound information.
Dolby 5.1 (AC-3)
DTS (Digital Theater Sound)
The video and audio tracks are then combined into a single bitstream via
a process called multiplexing.
The resulting "image" is then transferred to a data tape
This master tape is then used to create a glass master which is used in
replication to create the individual DVDs.