HarmonyOS 使用原生video组件，无法获取视频内容的宽高

该该问题可参考如下代码实现：问题可参考如下代码实现：

aboutToAppear(): void {
  media.createAVPlayer((error: BusinessError, player: media.AVPlayer) => {
  player.on('stateChange', async (state: string, reason: media.StateChangeReason) => {
  switch (state) {
case 'initialized':
player.prepare();
break;
  case 'prepared':
  player.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
    if ((arrList) != null) {
      console.debug("getTrackDescription", arrList[0][media.MediaDescriptionKey.MD_KEY_WIDTH])
      console.debug("getTrackDescription", arrList[0][media.MediaDescriptionKey.MD_KEY_HEIGHT])
    } else {
      console.error(`video getTrackDescription fail, error:${error}`);
    }
    player.release();
  });
  break;
}
})
player.url = this.params.src
});
}