Writing your own video codec

I've got a requirement to implement a video codec from Symbian C++ in J2ME.
Ideally I'd like to just write the codec and hook it into the MMAPI media player (javax.microedition.media) but this looks doubtful from the specs.
I really don't want to be rendering the frames myself, but if I have to, I will.
Does anyone have any exprience of this? Have you done it? What approach did you use, and even if not, how would you go about it?
Many thanks in advance as always,
Michael

Hi,
The project was called to a halt before I could get into it to any degree that might be useful. The most serious issue we faced when doing basic trials was frame rate, which we were worried about for lower performance CPU's especially.
Not much help, I know. Sorry!
Michael
p.s. Apologies for taking so long to reply. I could not remember my login details!

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