Audio delay silent problem

I set the audio delay in LAV audio decoder for 5000 ms (5 seconds) and the sound is just silent for 5 seconds and then start playing.  I want audio delay to start the same time as the video when I change to another part of video. Could you tell me anyway to fix that silent? I'm using MPC. Sorry for my bad English.

It does exactly what you tell it to do. Delay audio with 5 seconds.

Why are you using this long delay?

A potential solution would be to fix your file. With MkvToolNix your can remux the contents of your video into a .mkv file. It allows you to define an audio delay. Then you won't have silence when seeking.