have been having this doubt ever since blu ray hit india. some say it uses mpeg4, and many say its mpeg2 but uses a different codec than what is used in dvds. plz clarify.
Blu-ray is independent of the codecs - mpeg2 or mpeg4. The main differneces are the the point where the sources are being viewed (TV vs. computer) and the compression factors (or bit rates as its referred to ).
Video for TV is not as compressed as that meant for PC (web). mp4 maintains a relatively good quality even under high compression.
mp2 sources are much more prevalent and as such DVDs, VCDs support this predominantly.
For HD DVD, Sony chose mp2 while Toshiba chose mp4. We all know how that ended
