See: https://cgit.freedesktop.org/mesa/mesa/log/?h=mesa-18.0.1 and exactly: https://cgit.freedesktop.org/mesa/mesa/commit/?h=mesa-18.0.1&id=19db663cf028c184b1173795d1d38b152743e781 and also mentioned in the Changelog:
Mark Thompson (1): st/va: Enable vaExportSurfaceHandle() -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1760566 Title: mesa does not include vaExportSurfaceHandle support for vaapi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1760566/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp