如何实现在服务端录制视频会议？

if (desktopShare) //如果有人分享桌面，这主体内容区就是桌面图像
{
    //获取屏幕分享的最新桌面图像帧
    Image image = this.connectorManager.GetCurrentImage(null);
    canvas.SetDesktopImage(image);
}
else
{
    for (int i = 0; i < recordMembers.Count; i++)
    {
        string userID = recordMembers[i];
        Image image = null;
        if (!meeting.CamClosedMemberList.Contains(userID))
        {
            //获取参会成员的最新视频图像帧
            image = this.connectorManager.GetCurrentImage(userID);
        }
        
        DrawInfo renderModel = this.drawInfoManagers.Get(userID);
        renderModel.SetCameraImage(image);
        renderModel.SetMicState(!meeting.MuteMemberList.Contains(userID));
    }
    //绘制主体内容区
    canvas.SetCameraImage(this.drawInfoManagers.GetAll());
}
byte[] bytes = canvas.RenderImage(); //准备好要录制的图像
if (bytes != null)
{
    this.videoFileMaker?.AddVideoFrame(bytes); //提交给录制器    
}

IConnectorManager connectorManager = new OMCSConnectorManager(globalCache);
connectorManager.AudioMixed += ConnectorManager_AudioMixed;

private void ConnectorManager_AudioMixed(string userID, byte[] data)
{
    if (recording && data != null)
    {
        this.videoFileMaker?.AddAudioFrame(data);  //将混音数据提交给录制器        
    }
}

//开启录制线程，定时调用
internal void StartRecord()
{
    recording = true;
    Task.Factory.StartNew(() =>
    {
        RecordThread();
    });
}

private void RecordThread()
{
    int sleepSeconds = 1000 / frameRate;
    while (true)
    {
        System.Threading.Thread.Sleep(sleepSeconds);
        //record ...
    }
}

internal void FinishRecord()
{
    recording = false;
    //释放麦克风、摄像头、桌面设备连接器
    connectorManager.DisconnectAllConnect();
    //释放录制器
    videoFileMaker?.Close(true);
}