split-video-on-scene.js

import "@johnlindquist/kit"
const leadingzero = await npm("leadingzero")
const replaceAll = await npm("just-replace-all")
    
// Name: split-video-on-scene

// NOTE: SRT file should not have .mp4 in its name!
// video.mp4 and video.srt      Not video.mp4.srt!

let longVideoFile = await getSelectedFile()

await(hide)


cd(path.dirname(longVideoFile))

// requires the scenedetect Python library
// pip install --upgrade opencv
// pip install --upgrade scenedetect[opencv]

let {stdout} = await exec(`scenedetect --input "${longVideoFile}" --frame-skip 2 --min-scene-len 00:03:00 --merge-last-scene detect-content -t 40  list-scenes`)

// parse detected scenes, adding 0s for the start
let timecodelist = ['00:00:00', ...stdout.split('\n')[stdout.split('\n').length-1].trim().split(',')]


let originalFilename = longVideoFile.split('/')[longVideoFile.split('/').length - 1]

let cutsToMake = timecodelist.map((time, index) => {
  if (time[index + 1] == undefined) {
    return {
      from: time,
      desc: `${originalFilename}-part${leadingzero(index+1, 2)}`,
    }
  }
  
  return {
    from: time,
    to: timecodelist[index+1],
    desc: `${originalFilename}-part${leadingzero(index+1, 2)}` 
  }
})

for (let cut of cutsToMake) {
  let clipFileName = `${replaceAll(cut.desc, ' ', '_')}`

  await exec(`ffmpeg -i "${longVideoFile}" -c copy -ss ${cut.from} ${cut.to ? `-to ${cut.to}`: ''} ${clipFileName}.mp4`)
  
  // also split the SRT file
  await exec(`ffmpeg -i "${replaceAll(originalFilename, '.mp4', '.srt')}" -c copy -ss ${cut.from} ${cut.to ? `-to ${cut.to}`: ''} ${clipFileName}.srt`)
}