On Thu, 21 Sep 2000, you wrote:
> > P.S. mp3 is not the same as MPEG - I've noticed many people are confused about
>that.
> > MPEG is video, mp3 is audio only.
>
> Unless I've gone nuts or this has change, MP3 does indeed mean MPEG, in
> a way. MP3 is short for MPEG3, which is an audio format. MPEG1 and MPEG2
> are video/audio formats. MPEG4 is also a video/audio format? Is this
> wrong? Someone feel free to correct me if it is...
MP3 = MPEG1 Layer 3 and describes the psycho-acoustic compression of audio
signals only
So MP3 is actually part of MPEG 1, but Layer 3 is the audio....
MPEG3 doesn't actually exist anymore...
>From [71] Introduction to MPEG (long) FAQ
http://www.faqs.org/faqs/compression-faq/part2/section-2.html
Q: What is MPEG, exactly?
A: MPEG is the "Moving Picture Experts Group", working under the
joint direction of the International Standards Organization (ISO)
and the International Electro-Technical Commission (IEC). This
group works on standards for the coding of moving pictures and
associated audio.
Q: What is the status of MPEG's work, then? What's about MPEG-1, -2,
and so on?
A: MPEG approaches the growing need for multimedia standards step-by-
step. Today, three "phases" are defined:
MPEG-1: "Coding of Moving Pictures and Associated Audio for
Digital Storage Media at up to about 1.5 MBit/s"
Status: International Standard IS-11172, completed in 10.92
MPEG-2: "Generic Coding of Moving Pictures and Associated Audio"
Status: Comittee Draft CD 13818 as found in documents MPEG93 /
N601, N602, N603 (11.93)
MPEG-3: no longer exists (has been merged into MPEG-2)
MPEG-4: "Very Low Bitrate Audio-Visual Coding"
Status: Call for Proposals 11.94, Working Draft in 11.96
Q: MPEG-1 is ready-for-use. How does the standard look like?
A: MPEG-1 consists of 4 parts:
IS 11172-1: System
describes synchronization and multiplexing of video and audio
IS 11172-2: Video
describes compression of non-interlaced video signals
IS 11172-3: Audio
describes compression of audio signals
CD 11172-4: Compliance Testing
describes procedures for determining the characteristics of coded
bitstreams and the decoding porcess and for testing compliance
with the requirements stated in the other parts
--
If some people didn't tell you, you'd never know they'd been away on vacation.
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