video & audio sync tweat help

[FuzMic]

Hi friends

I have a movie in a mkv container where the audio does not sync correctly with video. This unsync is more pronounced when using vlc and less in mpc-hc. Can some experts tell me why is this so and how to tweat the vlc & mpc-hc to sync them. Thanks

PS Just found: MPC-HC at autdio switcher > audio time shift option set + / - ####ms
In VLC use fast key J or K for backward & forward
To permanently fix shift use Avidemux.

Still appreciate comments.

[FuzMic]

More findings hoping to get some insight from gurus

The unsync seems to somewhat inconsistent and always from vlc even with the last v215. The major point is why mpc-hc in most videos never have this unsync issue but in vlc seems to be occur most of the time. The end result i use mpc-hc more. Any insight to this.