Ok got it now . Works like a charm.

The problems seem to be that while I was downloading pali's kernel packages, he was uploading them in the same time. So looks like some packages were older builds than others.

Anyway, I notice that the time of my packges were pretty close to upload time, so I redownload everything, reinstall the kernel again and copy bridgedriver.ko.

After a reboot, I saw video starting playback for 1 sec. and then again "unsupported format".
So I did shutdown and fresh start.
MP now plays everything as expected.
I have also tested the new camera-ui and record 720p video.
I'm happy N900 user now. I will sleep better tonight.