this.ctx.drawImage(video,0,0,widht,height) 我这个没法正常绘画

我用videodecoder 对视频进行解码，拿到帧数据后，画到canvas上面，不过videodecoder在seek后获取不到帧数据了，求解

draw() {
    const dpr = wx.getSystemInfoSync().pixelRatio
    wx.createSelectorQuery().select('#video').context(res => {
      console.log('select video', res)
      const video = this.video = res.context


      wx.createSelectorQuery().selectAll('#cvs1').node(res => {
        console.log('select canvas', res)
        const ctx1 = res[0].node.getContext('2d')
        res[0].node.width = 300 * dpr
        res[0].node.height = 200 * dpr


        setInterval(() => {
          ctx1.drawImage(video, 0, 0, 300 * dpr, 200 * dpr);
        }, 1000 / 24)
      }).exec()
    }).exec()
  },
})



https://developers.weixin.qq.com/miniprogram/dev/api/canvas/RenderingContext.html

同求