Thank you Magnus but I don't think this is the solution.
When I choose 'Render to JPEG2000', the resolution becomes grey with 2048 x 1080 and cannot be changed. It seems to be only the case with JPEG 2000, regardinless the resolution of the project...
The strange thing is that when you choose easydcp, you have access to many more resolution.
But my goal is not to make a dcp directly from resolve which lakes option, but to encode JPEG2000 faster than easyDCP does and after finish the dcp with easydcp.
Someone from BM may help me ?
Config : Mac Pro 2010, 12x2,4Ghz, 32Go Ram, 2x690GTX,GT120, Decklink 3D+, RED Rocket, system on Crucial SSD 500, RAID FC 8gb Lacie 24To, CYCLONE PCI expander, Resolve 9.1.3