Unity Editor stuck when play a bigsize video by MovieTexture.

I'm want play a video by MovieTexure with the simple code:

 using UnityEngine;
 public class PlayingVideoOnPC : MonoBehaviour {
     public MovieTexture movieTexture;
     public Renderer renderer;
 
     void Start()
     {
         renderer.material.mainTexture = movieTexture;
         movieTexture.loop = true;
 
         movieTexture.Play();
     }
 }

but editor freeze after Play 5 seconds.
detail: 1) the video about 170M+ .2) a build .exe also stuck. 3) unity version is 5.4.1p3 on windows10
I have try a small video about 20M, it play well.
Does someone know how to solve the problem? I think its a common issue when use Unity play video.Any advise thanks.