Thanks,
I'm using an x86 computer,
I use an Avermedia USB TNT dongle
07ca:3835 AVerMedia Technologies, Inc. AVerTV Volar Green HD (A835B)
I think the problem come from the upgrade from Matrix to Nexus, it looks like the extension repository still reference the Matrix version.
I finally solve the problem, re-instilling everything from scratch.
Now the problem is solve for me anyway the upgrade did not works as expected.