[opendtv] Re: The New Mac Mini is All About Movies

At 11:56 PM -0800 1/26/05, johnwillkie@xxxxxxxxxx wrote:
>First off, thanks for the opending.
>
>Secondly, MP-3 audio is MPEG-2 layer 3 audio, not MPEG-1 audio (unless
>it's both; I play in AC-3 mostly).
>

  http://www.chiariglione.org/mpeg/      

This is the home page of the Moving Picture Experts Group (MPEG) a 
working group of ISO/IEC in charge of the development of standards 
for coded representation of digital audio and video. Established in 
1988, the group has produced MPEG-1, the standard on which such 
products as Video CD and MP3 are based, MPEG-2, the standard on which 
such products as Digital Television set top boxes and DVD are based, 
MPEG-4, the standard for multimedia for the fixed and mobile web and 
MPEG-7, the standard for description and search of audio and visual 
content. Work on the new standard MPEG-21 "Multimedia Framework" has 
started in June 2000. So far a Technical Report and two standards 
have been produced and three more parts of the standard are at 
different stages of development. Several Calls for Proposals have 
already been issued.

Read Rob Koenen's paper "From MPEG-1 to MPEG-21: Creating an 
Interoperable Multimedia Infrastructure" to have a full exposure to 
the range of standard technologies produced by MPEG in its 15 years 
of activity.

-------------

You can download Rob's paper from the URL above.

The audio component of MPEG-2 is Advanced Audio Coding (AAC). I may 
have indicated previously that this was part of MPEG-4. As Rob noted, 
MPEG-4 audio is AAC Plus. But many standards that use MPEG-2 for 
video coding use other audio technologies such as AC-3.

Regards
Craig
 
 
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