Right click on the video, "stats for nerds" and there it says if hardware decoding is working or not.
It should read something like:
VP8/9 videos (html5) are NOT decoded by hardware btw (no hardware decoding exists), only the h264 streams that come only via the flash player.
accelerated video rendering, hardware video decoding
At least on the Adobe version of flash VDPAU works even with the opensource radeon drivers IF its enabled in /etc/adobe/mms.cfg
, but it breaks the plugin on many other pages (crashes). Back when i had a 8200 nvidia it was exactly the same behavior btw.
BTW it seems that the Adobe plugin handles hardware accelerated playback just fine, only Google's version chokes (as in "uses 200-300% CPU and its laggy").
But 3d acceleration with webgl is crap too. It uses insane amounts of CPU to lag like hell.
So, in that link they say mesa is ok for them. Why their own plugin+webgl works like crap with it then (latest git kernel/mesa/xf86-ati version on Radeon HD 8570D)?
Once more: the same webgl demos work just perfect in Firefox/Seamonkey with very low CPU usage with the same hardware/d.