audio:
(required)
linear pcm (lpcm) - up to 8 channels of uncompressed audio.
dolby digital (dd) - for dvds, 5.1 surround sound.
dts digital surround - for dvds, 5.1 surround sound.

(optional)
dolby digital plus (dd+) - extension of dolby digital, 7.1 surround sound.
dolby truehd - lossless encoding of up to 8 channels of audio.
dts-hd high resolution audio - extension of dts, 7.1 surround sound.
dts-hd master audio - lossless encoding of up to 8 channels of audio.

video:
mpeg-2 - enhanced for hd, also used for playback of dvds and hdtv recordings.
mpeg-4 avc - part of the mpeg-4 standard also known as h.264 (high profile and main profile).

smpte vc-1 - standard based on microsoft's windows media video (wmv) technology.


all blu-ray players and recorders will have to support playback of these audio and video codecs; it’s still be up to the studios which video codec(s) they will use.