message: Set _isConnectedToTicker to false when disposing VideoResource
diff: @@ -333,6 +333,7 @@ export class VideoResource extends BaseImageResource
  if (this._isConnectedToTicker)
  {
  Ticker.shared.remove(this.update, this);
  + this._isConnectedToTicker = false;
  }
  const source = this.source as HTMLVideoElement;
  