Question 【WebGL】VideoPlayer sound and video are out of sync

We are using Unity 2021.3.16f1 and the platform is WebGL.
The mp4 on the server is played using VideoPlayer.
As the title suggests, the sound and video are out of sync.
Specifically, while the video is frozen, the audio does not stop, only the audio precedes it.
VideoPlayer.time is incremented with the audio, even if the video is frozen.
This problem occurs only with WebGL.
The VideoPlayer configuration is as follows

Code (CSharp):

1.  private VideoPlayer CreateVideoPlayer()
2.         {
3.             videoPlayerObject = new GameObject("VideoPlayerObject");
4.             videoPlayerObject.transform.parent = this.transform;
5.             videoPlayerObject.transform.position = Vector3.zero;
6.             var vp = videoPlayerObject.AddComponent<VideoPlayer>();
7.             VideoPlayerSetting(vp);
8.             return vp;
9.         }
10.  
11.         private void VideoPlayerSetting(VideoPlayer vp)
12.         {
13.             vp.prepareCompleted += OnPrepareCompleted;
14.             vp.renderMode = VideoRenderMode.MaterialOverride;
15.             vp.targetMaterialRenderer = screenRenderer;
16.             vp.playOnAwake = true;
17.             vp.isLooping = false;
18.             vp.waitForFirstFrame = true;
19.             vp.skipOnDrop = false;
20.             vp.source = VideoSource.Url;
21.             vp.audioOutputMode = VideoAudioOutputMode.Direct;
22.         }
23.  

Is there a solution?

 

The URL is erased.
The VideoPlayer in the inspector looks like this

 

Hi, @The_Island Is there a way to add a buffer or loading wheel to let the video catch up to the audio before resuming? I have a 10 second forward and backward button as well as the video slider and sometimes it'll freeze the video while the audio continues to play correctly, and then after a few seconds the video catches back up. I'm on 2020.3.38f1