Intel VAAPI howto with Leia v18 nightly based on Ubuntu 18.04 server
Thanks for nailing down this issue :-)
BTW I haven't seen message with info about updated Intel driver (this thread is so big ...). Maybe you should mention it in post #1?

Messages In This Thread
RE: New Era: VAAPI with EGL interoperation - by BigL-New - 2015-09-15, 20:29
Live TV broken again? - by schamane - 2016-02-29, 19:56
Random crashes - by hal2100 - 2016-03-08, 22:03