[Mp4-tech] MPEG-4 compression

[sunx]

On Tue, 28 Oct 2003, Serge GEDEON wrote:
> Dear All,
>
> I am currently comparing different compression solutions for streaming pedagogical multimedia contents over the Internet.
>
> But with the software I am using (Envivio coding station 2.1) to encode MPEG-4 content,
> I can't reach the same quality with the same bitrate as with Real 9. Real 9 compression is better, the thing that I find a bit odd.
>
> Could anyone help me in this? did anyone do such a comparison? may it be the soft that I am using? could anyone advise me with another soft?
> or may it be the parameters that I am using, I ve tryed aproximatly all the combinations possible!!!
>

I believe one major reason that MPEG-4 is better than MPEG-2 is that it
has better motion compensated coding, which is especially true in H.264.
My suggestion is that maybe you need to tune those paramters of control
PVOP and BVOP coding carefully. Real format is modified from MPEG-2 (?),
so MPEG-4 should at least achieve the comparative performance in most
cases.
>
> Thanks in advance,
> Serge GEDEON
> Ph.D. Student
> Paul Sabatier University - Toulouse, France