flv.js在vue中的使用

Flv.js 是 HTML5 Flash 视频（FLV）播放器，纯原生 JavaScript 开发，没有用到 Flash。由 bilibili 网站开源。它的工作原理是将 FLV 文件流转码复用成 ISO BMFF（MP4 碎片）片段，然后通过 Media Source Extensions 将 MP4 片段喂进浏览器。

使用方法

<template>
  <div class="video" :style="{ height: voidHeight }">
    <video ref="videoElement"  muted controls autoplay controlslist="nodownload noplaybackrate noremoteplayback" disablePictureInPicture="true" v-if="!imgError"></video>
    <div class="img_error" v-if="imgError">
      <p>无法连接相关设备</p>
    </div>
  </div>
</template>

<script>
import flvjs from "flv.js";
export default {
  name: "assemblyFlv",
  props: ["url", "height", "destroy","playon"], // 视频流路径，播放器高度，是否销毁播放器
  data() {
    return {
      flvPlayer: "",
      imgError: false,
      voidHeight: "",
      playOn:true
    };
  },
  mounted() {
    // 判断是否传入高度，如果没有，高度100%
    this.height ? (this.voidHeight = this.height) : (this.voidHeight = "100%");
    // 页面加载完成后，初始化
    this.$nextTick(() => {
      this.init(this.url);
    });
  },
  methods: {
    // 初始化
    init(source) {
      if (flvjs.isSupported()) {
        this.flvPlayer = flvjs.createPlayer(
          {
            type: "flv",
            url: source,
            isLive: true,
          },
          {
            enableWorker: false, //不启用分离线程
            enableStashBuffer: false, //关闭IO隐藏缓冲区
            reuseRedirectedURL: true, //重用301/302重定向url，用于随后的请求，如查找、重新连接等。
            autoCleanupSourceBuffer: true, //自动清除缓存
          }
        );
        var videoElement = this.$refs.videoElement;
        this.flvPlayer.attachMediaElement(this.$refs.videoElement);
        if (this.url !== "" && this.url !== null) {
            this.flvPlayer.load();
            //this.flvPlayer.play();
            setTimeout(() => { this.flvPlayer.play(); }, 100);
            // 加载完成
            this.flvPlayer.on(flvjs.Events.LOADING_COMPLETE, () => {
              this.imgError = false;
            });

            // 加载失败
            this.flvPlayer.on(
              flvjs.Events.ERROR,
              () => {
                if (this.flvPlayer) {
                    this.reloadVideo(this.flvPlayer);
                }else{
                  this.imgError = true;
                }
              },
              (error) => {
                console.log(error);
              }
            );

            this.flvPlayer.on(flvjs.Events.STATISTICS_INFO, (res) =>{
                if(this.playon != false){
                   if (this.lastDecodedFrame == 0) {
                     this.lastDecodedFrame = res.decodedFrames;
                     console.log(this.lastDecodedFrame)
                     return;
                   }
                   if (this.lastDecodedFrame != res.decodedFrames) {
                     this.lastDecodedFrame = res.decodedFrames;
                   } else {
                       this.lastDecodedFrame = 0;
                       console.log('卡住重连')
                       if (this.flvPlayer) {
                         this.reloadVideo(this.flvPlayer);
                         console.log('卡住重连完成')
                     }
                   }
                  }
                 });

            videoElement.addEventListener("progress", () => {
              if(videoElement.buffered.length != 0){
                let end = videoElement.buffered.end(0); //获取当前buffered值(缓冲区末尾)
                let delta = end - videoElement.currentTime; //获取buffered与当前播放位置的差值

                // 延迟过大，通过跳帧的方式更新视频
                if (delta > 10 || delta < 0) {
                  this.flvPlayer.currentTime = this.flvPlayer.buffered.end(0) - 1;
                  console.log('跳帧')
                  return;
                }
                // 追帧
                if (delta > 1) {
                  videoElement.playbackRate = 1.1;
                  console.log('追帧')
                } else {
                  videoElement.playbackRate = 1;
                  console.log('正常')
                }
              }
            });

            // 点击播放按钮后，更新视频
            videoElement.addEventListener("play", () => {
              if(videoElement.buffered.length > 0){
              let end = videoElement.buffered.end(0) - 1;
              this.flvPlayer.currentTime = end;
              console.log('播放最新')
              }
            });
            // 网页重新激活后，更新视频
            window.onfocus = () => {
              if(videoElement.buffered.length > 0){
                let end1 = videoElement.buffered.end(0) - 1;
                this.flvPlayer.currentTime = end1;
                console.log('页面切换')
              }
            };




        }

      } else {
        this.imgError = true;
      }
    },
    //断线重连
    reloadVideo(flvPlayer) {
          this.detachMediaElement();
          this.init(this.url);
          console.log('断线重连')
    },
    // 销毁
    detachMediaElement() {
      this.flvPlayer.pause();
      this.flvPlayer.unload();
      this.flvPlayer.detachMediaElement();
      this.flvPlayer.destroy();
      this.flvPlayer = "";
    },
  },
  watch: {
    url() {
      this.imgError = false;
      // 切换流之前，判断之前的流是否销毁
      this.flvPlayer == "" ? "" : this.detachMediaElement();
      // 初始化
      this.init(this.url);
    },
    destroy() {
      // 传入开关值
      if (this.destroy) {
        this.init(this.url);
      } else {
        this.flvPlayer == "" ? "" : this.detachMediaElement();
      }
    },
    playon() {
      this.reloadVideo(this.flvPlayer);
    }
  },
  beforeDestroy() {
    this.detachMediaElement();
  },
};
</script>

<style scoped>
.video {
  position: relative;
  height: 100%;
}
.video video {
  width: 100%;
  height: 100%;
  object-fit: fill;
}
.video video::-webkit-media-controls-play-button{
  display: none;
}
.video video::-webkit-media-controls-toggle-closed-captions-button {
    display: none;
}
.video video::-webkit-media-controls-timeline {
    display: none;
}
.video video::-webkit-media-controls-current-time-display {
    display: none;
}
.video video::-webkit-media-controls-time-remaining-display {
    display: none;
}
.img_error {
  position: absolute;
  top: 30%;
  left: 50%;
  margin-left: -120px;
  text-align: center;
}
.img_error > img {
  margin-bottom: 1em;
}
.img_error > p {
  color: #00fdff;
  font-weight: bold;
  font-size: 1.2em;
}
</style>

封装：

子组件封装：

<template>
    <div class="video-container">
      <video ref="videoElement" class="centeredVideo" controls autoplay muted></video>  
    </div>
</template>
 
<script>
import flvjs from "flv.js";  //引入flv
export default {
  props: {
    url : String,
  },
  data() {
    return {
      // src: ["http://172.21.1.111/live?port=1935&app=myapp&stream=streamname"],
    };
  },
  mounted() {
    this.flv_load(this.url);
  },
  methods: {
    flv_load(url) {
      if (flvjs.isSupported()) {
      let videoElement = this.$refs.videoElement;
        this.flvPlayer = flvjs.createPlayer(
          {
            type: "flv", //媒体类型
            url: url, //flv格式媒体URL
            isLive: true, //数据源是否为直播流
            hasAudio: false, //数据源是否包含有音频
            hasVideo: true, //数据源是否包含有视频
            enableStashBuffer: false, //是否启用缓存区
          },
          {
            enableWorker: false, // 是否启用分离的线程进行转换
            enableStashBuffer: false, //关闭IO隐藏缓冲区
            autoCleanupSourceBuffer: true, //自动清除缓存
          }
        );
        this.flvPlayer.attachMediaElement(videoElement); //将播放实例注册到节点
        this.flvPlayer.load(); //加载数据流
        this.flvPlayer.play(); //播放数据流
      }
    },
  },
};
</script>
 
<style scoped>
/* .video-container {
  display: inline-block;
  margin-right: 10px;
  width: 32%;
  height: 45%;
} */
.centeredVideo {
  width: 100%;
}
</style>

父组件调用：

<template>
  <el-card class="box-card">
    <div class="flvbox" v-for="(item,index) in src" :key="index">
    <!-- <VideoFlv url="http://172.21.1.111/live?port=1935&app=myapp&stream=streamname" /> -->
    <VideoFlv :url="item" />
    </div>
  </el-card>
</template>
 
<script>
import VideoFlv from "./VideoFlv.vue";
export default {
  components:{
    VideoFlv
  },
  data() {
    return {
      src: [
        "https://sf1-hscdn-tos.pstatp.com/obj/media-fe/xgplayer_doc_video/flv/xgplayer-demo-360p.flv",
        "https://sf1-hscdn-tos.pstatp.com/obj/media-fe/xgplayer_doc_video/flv/xgplayer-demo-360p.flv",
        "https://sf1-hscdn-tos.pstatp.com/obj/media-fe/xgplayer_doc_video/flv/xgplayer-demo-360p.flv",
        "https://sf1-hscdn-tos.pstatp.com/obj/media-fe/xgplayer_doc_video/flv/xgplayer-demo-360p.flv",
        "http://172.21.1.111/live?port=1935&app=myapp&stream=streamname",
        "https://sf1-hscdn-tos.pstatp.com/obj/media-fe/xgplayer_doc_video/flv/xgplayer-demo-360p.flv",
      ],
    };
  },
};
</script>
 
<style scoped>
.flvbox {
  display: inline-block;
  margin-right: 10px;
  width: 32%;
}
</style>

因为视频需要实时的后边发现上边写法暂停之后和切换页面之后会有延迟所以开发让新加个刷新按钮也已满足然后这个api的写法我尝试很多追帧啊更新视频啊都没生效父组件重新传值因为值没有变化所以也没有重新渲染所以用到了key 属性 vue每次渲染的时候会去拿这个key 值做对比，如果这一次的key 值和上一次的key值是不一样的才会重新渲染dom 元素，否则保持上一次的元素状态。所以我用了一个时间戳方法

flv.js在vue中的使用

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