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RE: [Opendivx] Mpeg2 -> Mpeg4

The main difference is that MPEG-4 is object-based, while
MPEG-2 is frame based.  Both use similar block-matching tecniques and


On Thu, 1 Feb 2001, Brian Smith wrote:

> Correct me if I'm wrong, but the major advances in MPEG-4 over MPEG-2 come
> from
> different algorithms from the predicted B and P frames.  The DCT-based
> compression
> of the I-Frames is the same.  So, you'd have to decode the data to gain any
> compression.
> Brian
> -----Original Message-----
> From: Ezra Auerbach [mailto:[email protected]]
> Sent: Thursday, February 01, 2001 11:53
> To: [email protected]
> Subject: [Opendivx] Mpeg2 -> Mpeg4
> Hi,
> I'm a third year student in collage. Every student in my college must choose
> a project to do durring his third/fourth year. One of the projects on the
> list was to write a program that converts mpeg2 to mpeg4 (or Mpeg1 to Mpeg2
> - but that isn't as interesting) without uncompressing the mpeg2 to a full
> bitmap and then recompressing...rather to use the compression to further
> compress it to mpeg4.  (The professor in charge of the project said he
> himself doesn't know if it is possible.)
> I wrote an email to the projectmayo team a while ago but haven't really
> gotten an answer yet, and I noticed a simular post here, so I was wondering
> if anyone can point me in the right direction. I kneed to know the
> following:
> 1) Is this at all posible
> 2) Is it worth spending time on (will compressing mpeg2->4 this way achive
> the same quality, speed)
> 3) Do you think it can be done in about a year (2 people that don't know
> much about compression working 15-20hours a week)
> 4) Where can I find a information on mpeg compression. (I've started going
> through the offical mpeg site...but I couldn't find information about how
> the compression works in all the mpeg documentation there.)
> Thanks for any help,
> Ezra Auerbach

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