You TV should support this lip sync function at the same time. However auto lip-sync function is not perfect. You can refer to the following article.Kravatak wrote:Sony STR-DH50 have this parametrs - HDMI version 1.4a with support for 3D video, Audio Return Channel, Deep Color, x.v.Color, auto lip-sync, and HDMI-CEC, its possible problem in wrong HDMI cable?
http://www.avsforum.com/t/1160970/how-t ... -sync-work
I don't think the problem is related to HDMI cable. It's digital signal. In case you can see the clear video, there should be no problem in cable.
I think you can try to connect nas to TV directly through HDMI. (might need to set to "analog" audio output in XBMC) If it works well, it should be certain settings related to your STR-DH520.