If it helps as a fallback solution....
I'm also on Yosemite 10.10.1 with Kodi b5 and I am having no problems at all, but I'm not using HDMI nor S/PDIF for Audio output.
My config is Audio Output device - Default, Built-in Output....with 2.0 speakers connecter to the headphone socket on my 2011 iMac.
Adjust display refresh rate to match video - OFF
Sync Playback to display - Enabled....
Mac OS X - Audio sync off with refresh rate switching (nightly builds)
Joined: Feb 2012
Location: Perth, Oz
2014-11-29 17:56 Post: #76
RPI2 vs ODROID-C1
Setup - FLIRC, Logitech Harmony Remote and XBMC
Joined: Mar 2014
2015-05-09 12:52 Post: #77
Preliminary testing suggests that the issue is gone in 15 beta1. I guess it's because of the (default) switch to ffmpeg-vda or the version bump thereof. I have to admit that I never tried activating ffmpeg-vda in Helix. (I think it was possible with advancedsettings.xml ?)
So, (cautious) yeah for less fan noise/electricity use!
I will test more thoroughly next week and encourage others to test as well.
Joined: Jul 2011
2015-05-11 13:16 Post: #78
Thanks for the update... I might have to come off openelec and back onto Mac OS if this is successful.