This script helps to intelligently split merged audio tracks on youtube, generating a list of ffmpeg commands

youtubetracksplitter.js

/**
 * ffmpeg script generator for merged audio tracks on youtube
 * @author nlac
 * @desc Helps to intelligently split merged audio tracks (eg. https://www.youtube.com/watch?v=Lf6yNZPwREU)
 *
 * Usage:
 * 1. download the merged track eg. using JDownloader
 * 2. open the youtube page in a browser + paste this script into the js console
 * 3. fill the variables in the first line (fullSong is the file name of the downloaded track)
 * 4. run the script
 * 5. save the generated log into a BAT file
 * 6. run the BAT file in the directory of the full track
 */
var fullSong = 'songs.m4a', artist = '', album = 'Ultimate Indie 2016', textOnTheRight = 1;
var cmds = [], warns = [], prev = undefined, ext = fullSong.match(/\w+$/)[0];
[].forEach.call(document.querySelectorAll('#eow-description a'), function(a, i) {
	if (a.innerHTML.match(/^(\d\d?[:.])+\d\d$/)) {
		var parts = a.innerHTML.split(/[:.]/);
		
		a._start = 0;
		for(var pl=parts.length,i=0; i<pl; i++)
			a._start += Math.pow(60,i) * parts[pl-1-i];

		a._txt = (textOnTheRight ? a.nextSibling : a.previousSibling).data.trim().replace(/^[\d.-\s\(\)\[\]]*/, '').replace(/[^\w-– ]/g,'').replace(/ +/g,' ').replace(/–/g,'-');

		if (prev) {
			var len = a._start - prev._start;
			if (len <= 0 || len > 1200)
				warns.push('Possibly bad length (' + len + ') found at ' + prev._txt + ' (next item:' + a._txt + ')');
			cmds.push('call ffmpeg -ss "' + prev._start + '" -t ' + len + ' -i "' + fullSong + '" -metadata title="' + prev._txt 
				+ '" -metadata artist="' + artist + '" -metadata album="' + album + '" -c:a copy "' + prev._txt + '.' + ext + '"');
		}
		prev = a;
	}
});
if (prev) {
	var len = 9999999;
	cmds.push('call ffmpeg -ss "' + prev._start + '" -t ' + len + ' -i "' + fullSong + '" -metadata title="' + prev._txt 
		+ '" -metadata artist="' + artist + '" -metadata album="' + album + '" -c:a copy "' + prev._txt + '.' + ext + '"');
}

console.info(cmds.join("\n"));
warns.forEach(function(w) {console.warn(w)});