[bleep42]

[*]ffmpeg: improved HEVC 1080p playback

John Cox is back working on HEVC acceleration for Pi.
This update switches to using the vchiq gpu service (rather than old mailbox interface) which allows more flexibility when submitting GPU jobs.
It also adds gpu support for weighted prediction which was one example that previously wasn't gpu accelerated.

So, if you have any HEVC (aka H.265) content then try it with this build. It should be a little better than the previous build
(and work is continuing).

Hi John & Popcornmix,
Thanks very much for this update, several of my H.265 files, which before were jerky, have improved markedly, some are now smooth, others still have a few stalls, but definitely a very useful improvement :-) Thank you.
Hope you'll be able to squeeze some more performance out in due course.
Regards Kevin.