HarmonyOS鸿蒙Next中Video组件的核心功能有哪些？

您好！

Video组件的基础用法，包括控制栏、预览图、自动播放、播放速度、控制器（开始播放、暂停播放、停止播放、重置avPlayer、跳转等）以及一些状态回调方法。

您可以参考以下demo：

该组件的使用文档：[https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V13/ts-media-components-video-V13](https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V13/ts-media-components-video-V13)

```javascript
// xxx.ets
[@Entry](/user/Entry)
[@Component](/user/Component)
struct VideoCreateComponent {
  [@State](/user/State) videoSrc: Resource = $rawfile('video1.mp4')
  [@State](/user/State) previewUri: Resource = $r('app.media.poster1')
  [@State](/user/State) curRate: PlaybackSpeed = PlaybackSpeed.Speed_Forward_1_00_X
  [@State](/user/State) isAutoPlay: boolean = false
  [@State](/user/State) showControls: boolean = true
  controller: VideoController = new VideoController()

  build() {
    Column() {
      Video({
        src: this.videoSrc,
        previewUri: this.previewUri,
        currentProgressRate: this.curRate,
        controller: this.controller
      })
        .width('100%')
        .height(600)
        .autoPlay(this.isAutoPlay)
        .controls(this.showControls)
        .onStart(() => {
          console.info('onStart')
        })
        .onPause(() => {
          console.info('onPause')
        })
        .onFinish(() => {
          console.info('onFinish')
        })
        .onError(() => {
          console.info('onError')
        })
        .onStop(() => {
          console.info('onStop')
        })
        .onPrepared((e?: DurationObject) => {
          if (e != undefined) {
            console.info('onPrepared is ' + e.duration)
          }
        })
        .onSeeking((e?: TimeObject) => {
          if (e != undefined) {
            console.info('onSeeking is ' + e.time)
          }
        })
        .onSeeked((e?: TimeObject) => {
          if (e != undefined) {
            console.info('onSeeked is ' + e.time)
          }
        })
        .onUpdate((e?: TimeObject) => {
          if (e != undefined) {
            console.info('onUpdate is ' + e.time)
          }
        })

      Row() {
        Button('src').onClick(() => {
          this.videoSrc = $rawfile('video2.mp4') // 切换视频源
        }).margin(5)
        Button('previewUri').onClick(() => {
          this.previewUri = $r('app.media.poster2') // 切换视频预览海报
        }).margin(5)
        Button('controls').onClick(() => {
          this.showControls = !this.showControls // 切换是否显示视频控制栏
        }).margin(5)
      }

      Row() {
        Button('start').onClick(() => {
          this.controller.start() // 开始播放
        }).margin(2)
        Button('pause').onClick(() => {
          this.controller.pause() // 暂停播放
        }).margin(2)
        Button('stop').onClick(() => {
          this.controller.stop() // 结束播放
        }).margin(2)
        Button('reset').onClick(() => {
          this.controller.reset() // 重置AVPlayer
        }).margin(2)
        Button('setTime').onClick(() => {
          this.controller.setCurrentTime(10, SeekMode.Accurate) // 精准跳转到视频的10s位置
        }).margin(2)
      }

      Row() {
        Button('rate 0.75').onClick(() => {
          this.curRate = PlaybackSpeed.Speed_Forward_0_75_X // 0.75倍速播放
        }).margin(5)
        Button('rate 1').onClick(() => {
          this.curRate = PlaybackSpeed.Speed_Forward_1_00_X // 原倍速播放
        }).margin(5)
        Button('rate 2').onClick(() => {
          this.curRate = PlaybackSpeed.Speed_Forward_2_00_X // 2倍速播放
        }).margin(5)
      }
    }
  }
}

interface DurationObject {
  duration: number;
}

interface TimeObject {
  time: number;
}