GoPro - Organise and merge video files

organiseGoPro.js

const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process')
const baseDir = './';

const videoFileTypes = ['mp4', 'mov', 'avi', 'wmv', 'mkv', 'flv', 'mpg', 'mpeg', '3gp', '3g2'];

const allFiles = fs.readdirSync(baseDir);

const videoFiles = [];
const videoDirectories = [];

allFiles.forEach((file) => {
  const ext = file.substring(file.lastIndexOf('.') + 1);
  if (videoFileTypes.indexOf(ext.toLowerCase()) > -1) {
    videoFiles.push(file);
  }
});

videoFiles.forEach((videoFile) => {
  console.log(`Moving file ${videoFile}`);
  const fileNameWithoutExt = videoFile.substring(0, videoFile.lastIndexOf('.'));

  const goproRecordingIndex = fileNameWithoutExt.slice(-4);
  const vidDir = path.join(baseDir, goproRecordingIndex);

  if (!fs.existsSync(vidDir)){
    fs.mkdirSync(vidDir);
  }

  if (videoDirectories.indexOf(vidDir) < 0) {
    videoDirectories.push(vidDir);
  }

  fs.renameSync(videoFile, path.join(vidDir, videoFile));
});
console.log(`Moving files complete\n`);

videoDirectories.forEach((dir) => {
  const movieFiles = fs.readdirSync(path.join(baseDir, dir));
  movieFiles.filter((videoFile) => {
    const ext = videoFile.substring(videoFile.lastIndexOf('.') + 1);
    if (videoFileTypes.indexOf(ext.toLowerCase()) > -1) {
      const fileNameWithoutExt = videoFile.substring(0, videoFile.lastIndexOf('.'));
      if (fileNameWithoutExt.indexOf('merged_') > -1) {
        return false
      }
      return true;
    }
  });

  const filePath = path.join(dir, 'filelist.txt');
  fs.writeFileSync(filePath, '');

  movieFiles.sort((a, b) => {
    if (a > b) {
        return 1;
    }

    if (b > a) {
        return -1;
    }

    return 0;
  });

  console.log(`Generating file list for ${dir}`);
  movieFiles.forEach((videoFile) => {
    const ext = videoFile.substring(videoFile.lastIndexOf('.') + 1);

    if (videoFileTypes.indexOf(ext.toLowerCase()) > -1) {
      fs.appendFileSync(filePath, `file '${videoFile}'\n`);
    }
  });
});
console.log(`Generation files list complete\n`);

console.log(`Merging video files:`);
videoDirectories.forEach((dir) => {
  const outputFile = `merged_${dir}.mp4`;
  const command = `ffmpeg -f concat -safe 0 -i ${path.join(dir, 'filelist.txt')} -c copy ${path.join(dir, outputFile)}`;
  console.log(command);
  const result = execSync(command);
  console.log(result);
});

console.log(`Merging videos complete\n`);