Q. Where did you see "all three codecs are required" ?
A. for the players. It was mentioned all over the place try http://www.blu-raydisc.com/assets/d..._0305-12955.pdf
in section 3.3
The spec mentioned does not use the word "required", it says:
BDROM provides an easy-to-author framework for creation of
High Definition movie experiences known as "HDMV",
(High Definition Movie) mode.
Here are some of the key features offered by HDMV:
MPEG-2, MPEG-4 AVC.....
Sorry I cannot cut and paste from this document, I encourage reading the
The format "offers" MPEG-4, thats a long way from saying "the first discs
will be in MPEG-4 format".
Now read what the blu-ray site says here:http://www.blu-raydisc.com/general_i...564/Index.html
"Also on the application layer, the HD-DVD format incorporates many compromises. As the capacity is not likely to be sufficient to encode a full-length feature plus additional bonus materials using the MPEG-2 format, different and stronger encoding formats need to be used. Although Blu-ray Disc offers these advanced codecs as well, the disc has such high capacity that publishers can still use the MPEG-2 encoding format at bitrates up to 54 Mbit/sec. As MPEG-2 is the de-facto standard used in almost any industry involved in digital video (DVD, HDTV, digital broadcast), many authoring solutions are available. Chances are high that a full line MPEG-2 encoding suite is already available, which can be used with no or minor adaptations to encode High Definition content for Blu-ray Disc."
Note that again, the word used is "offers".
This is not new, the Blu-ray group has touted from day one that their big advantage is
allowing the use of the present mpeg-2 format.
So, at the risk of beating this dead horse into the ground, again, there is every reason
to expect that the first discs out in BD format will be mpeg-2, and single layer.
Again, I encourage anyone wanting the facts to read this information for him/herself