Intel VAAPI howto with Leia v18 nightly based on Ubuntu 18.04 server
Haven't seen a sync delay only on one audio format. The typical symptom is all 23.976 fps content (25fps and higher are fine) require a delay of around 175ms regardless of audio format (DD/DTS/AAC/MP3). I don't think Kodi does this delay by default yet, but OpenElec does. Except for the test version in this thread, which had it removed, although it may go back again.

Messages In This Thread
RE: New Era: VAAPI with EGL interoperation - by Sunflux - 2015-09-23, 08:15
Live TV broken again? - by schamane - 2016-02-29, 19:56
Random crashes - by hal2100 - 2016-03-08, 22:03