"ffmpeg -loglevel panic -y -i "video.mp4" -frames 1 -q:v 1 -vf "select=not(mod(n,40)),scale=-1:120,tile=100x1" video_preview.jpg "

let ffmpeg = spawn(
'ffmpeg', [
'-i', `${ Inputvideofile }`,
'-y',
'-frames',1,
'-q:v', '1',
'-vf', ' "select=not(mod(n,120)),scale=-1:40,tile=10x1 "  ',
`${ outpputImgstripe }`
]);
ffmpeg.on('exit', (statusCode) => {
    console.log(statusCode)
  if (statusCode === 0) {
     console.log('conversion successful')
  }
})
ffmpeg
  .stderr
  .on('data', (err) => {
    console.log('err:', new String(err))
  })

module.exports = router;

Error initializing filter 'select' with args '"not(mod(n'n']
err: [String: 'Error reinitializing filters!nFailed to inject frame into filter network: Invalid argumentnError while processing the decoded data for stream #0:0n']
err: [String: 'Conversion failed!n']
1

'-vf', ' "select=not(mod(n,120)),scale=-1:40,tile=10x1 "  ',