Hittade detta, som verkar fungera rätt bra!
How to synchronize Airport Express, Airfoil and VLC for MOVIE PLAYBACK
In VLC (this relates to version 0.84) set up the "Advanced Options" otherwise you won't see the options described in the following.
Go to the VLC preferences>Input/Codecs>access modules>file.
Make sure the advanced checkbox is checked so you can see the "caching value in ms" field. Set this in all modules to something larger than the delay you want (3000 should be ok). After making that adjustment, save your preferences.
Now choose a film out of your library and just hit the "F" key during playback until the delay is set to -2650 (beware: this is a MINUS). For some people -2400 will be better, but you should just get to a dialogue scene and watch the lipsync becoming better.
SAVE the settings. The adjustment is now all synched up!
BTW if you are as lazy as I am, set the Default Delay in the VLC preferences>Audio to -2400 (-2650) so it starts this way."