m4a_to_cue.js

var exec = require('child_process').exec,
    fs = require('fs');

var fileName = 'mc75';

var stream = fs.createWriteStream(fileName + ".cue");

stream.once('open', function(fd) {

    exec("ffprobe -v quiet -of json -show_chapters "+ fileName +".m4a", function (error, stdout, stderr) {

        var m4aData = JSON.parse(stdout);

        stream.write("PERFORMER \"Skream\"\n");
        stream.write("TITLE \"Monster Cat Ep. 84\"\n");
        stream.write("FILE \"" + fileName +".mp3\" MP3\n");

        for(var i=0; i < m4aData['chapters'].length; i++) {

           var startTime = parseFloat(m4aData['chapters'][i]['start_time']);

            stream.write("  TRACK " + (i+1) + " AUDIO\n");
            stream.write("    PERFORMER \"" + m4aData['chapters'][i]['tags']['title'] + "\"\n");
            stream.write("    INDEX 01 " + parseInt(startTime / 60) + ":" + parseInt(startTime % 60) + ":00\n");
        }

        console.log(m4aData['chapters']);
    });
});