check streamability

ffmpeg-utils.ts

async function isVideoFileStreamable (path: string): Promise<{ [key: string]: boolean }> {
  let stream = fs.createReadStream(path, {
    encoding: null,
    start: 0,
    end: 1024 * 1024
  })

  const isAVC = (await getVideoFileStream(path)).filter(s => {
    return s['codec_name'] === 'h264' &&
           s['bit_rate'] < 3000000
  })
  const isAAC = (await audio.get(ffmpeg, path)).filter(s => {
    return s['codec_name'] === 'aac'
  })
  const hasFastStart = await new Promise<boolean>((res, rej) => {
    ffmpeg(stream, { stdoutLines: 0 })
      .inputOption('-v 56')
      .on('error', rej)
      .on('end', (stdout) => res(stdout.indexOf('type:\'moov\'') < stdout.indexOf('type:\'mdat\'')))
  })

  return {
    hasFastStart,
    isAVC,
    isAAC
  }
}