<template>
  <video :src="video" controls />
  <br />
  <button @click="transcode">Start</button>
  <p>{{ message }}</p>
</template>

<script lang="ts">
import { FFmpeg } from '@ffmpeg/ffmpeg'
import type { LogEvent } from '@ffmpeg/ffmpeg/dist/esm/types'
import { fetchFile, toBlobURL } from '@ffmpeg/util'
import { defineComponent, ref } from 'vue'

const baseURL = 'https://unpkg.com/@ffmpeg/core-mt@0.12.10/dist/esm'
const videoURL = 'https://raw.githubusercontent.com/ffmpegwasm/testdata/master/video-15s.avi'

export default defineComponent({
  name: 'App',
  setup() {
    const ffmpeg = new FFmpeg()
    const message = ref('Click Start to Transcode')
    let video = ref('')

    async function transcode() {
      message.value = 'Loading ffmpeg-core.js'
      ffmpeg.on('log', ({ message: msg }: LogEvent) => {
        message.value = msg
      })
      await ffmpeg.load({
        coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),
        wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),
        workerURL: await toBlobURL(`${baseURL}/ffmpeg-core.worker.js`, 'text/javascript')
      })
      message.value = 'Start transcoding'
      await ffmpeg.writeFile('test.avi', await fetchFile(videoURL))
      await ffmpeg.exec(['-i', 'test.avi', 'test.mp4'])
      message.value = 'Complete transcoding'
      const data = await ffmpeg.readFile('test.mp4')
      video.value = URL.createObjectURL(
        new Blob([(data as Uint8Array).buffer], { type: 'video/mp4' })
      )
    }
    return {
      video,
      message,
      transcode
    }
  }
})
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>
