phpBB2 to phpBB3

We have a forum that runs phpBB2. The current site has html code enabled so users can post embed video and other similar stuff. We want our forum to run on a new platform, with unlimited sub-forums capabilities, attachment system more seo stuff. We are thinking to move on phpBB3, but also you can suggest a better free platform. We are open-minded to possibilities, but you'll need to give us few arguments for you choice. The mission is to import all current forum data into the new platform. The short description below refers to phpBB3, but might be helpful and other cases. You're job consist in: Making an php script that we'll run on our servers (for security and privacy reasons, you will not have access to our servers) * The script needs to import and convert all embed codes to custom BBcodes codes: * you will need to create custom BBcodes for each site that has embed videos on our forums (we can provide a list) * replace all embed codes with BBcode created Please post any questions / suggestions you have.