Iframe相关的问题，跳转404？

Question

    <el-dialog :visible.sync="videoVisible" width="85%" destroy-on-close append-to-body :before-close='beforeClose'>
          <div style="height: 95vh">
            <iframe :src="videoUrl" id="iframepage" name="iframepage" frameBorder='0' width="100%" height="200px"></iframe>
            <div style="text-align: center;  height: 80px;">
                <el-button icon="el-icon-video-play" size="mini" @click="openVideo" type="info">播放视频</el-button>
            </div>
            <span style="font-size: larger; font-family: cursive; color: black; font-weight: 500; float: left;">
              <span style="font-weight: 900;">视频名称：</span>{{videoName}} <br/>
              <span style="font-weight: 900;">问题描述：</span>{{issuedesc}} <br/>
              <span style="font-weight: 900;">要点内容：</span>{{pointContent}}
            </span>
          </div>
        </el-dialog>

采用上面的代码用iframe内嵌了一个网页，网页上是一个视频，为什么部分视频播放的时候会跳转到404