How to use mp4box - 5 common examples

var fs = require('fs');
var mp4boxModule = require('mp4box');

if (process.argv.length > 3) {
	var mp4box = new mp4boxModule.MP4Box();
	mp4box.onReady = function(info) {		
		var found = false;
		for (var i = 0; i < info.tracks.length; i++) {
			if (info.tracks[i].id == process.argv[3]) {
				mp4box.setExtractionOptions(info.tracks[i].id);  
				found = true;
			}
		}
		if (found === false) {
			console.log("Track id "+process.argv[3]+" not found in file "+process.argv[2]);
		}
		mp4box.start();
	};
	mp4box.onSamples = function (id, user, samples) {
    	console.log("Received "+samples.length+" samples on track "+id+" for object "+user);
    	for (var i = 0; i < samples.length; i++) {

var fs = require('fs');
var mp4boxModule = require('mp4box');

if (process.argv.length > 2) {
	var mp4box = new mp4boxModule.MP4Box();
	var arrayBuffer = new Uint8Array(fs.readFileSync(process.argv[2])).buffer;
	arrayBuffer.fileStart = 0;

	mp4box.appendBuffer(arrayBuffer);
	console.log(mp4box.getInfo());
} else {
	console.log("usage: node info.js ");
}

var fs = require('fs');
var mp4boxModule = require('mp4box');

if (process.argv.length < 5) {
	console.log("usage: node fragment.js    ");
	return;
}

var out = fs.createWriteStream(process.argv[5]);

var mp4box = new mp4boxModule.MP4Box();

mp4box.onReady = function (info) {
	var found = false;
	var segOptions = { nbSamples: +process.argv[4] };
	console.log("Movie information received");
	for (var i = 0; i < info.tracks.length; i++) {
		if (info.tracks[i].id != process.argv[3]) continue;
		console.log("Segmenting track "+info.tracks[i].id+" with "+segOptions.nbSamples+" per segment");
		mp4box.setSegmentOptions(info.tracks[i].id, null, segOptions);
		found = true;
	}
	if (found) {
		var segs = mp4box.initializeSegmentation();
		out.write(toBuffer(segs[0].buffer));
		mp4box.seek(0, true);
		mp4box.start();

var fs = require('fs');
var MP4Box = require('mp4box');

if (process.argv.length < 3) {
	console.log("usage: node mp4codec.js ");
	return;
}

var mp4boxfile = MP4Box.createFile();
var stopParse = false;

mp4boxfile.onReady = function (info) {
	var mime = 'video/mp4; codecs=\"';
	for (var i = 0; i < info.tracks.length; i++) {
		if (i !== 0) mime += ',';
		mime+= info.tracks[i].codec;
	}
	mime += '\"';
	console.log(mime);
	stopParse = true;
}

var filePos = 0;
var filereader = fs.createReadStream(process.argv[2]);
filereader.on('readable', function () {

return new Promise(function(resolve, reject) {
    var readBlock = readBlockFactory();
    mp4boxFile = MP4Box.createFile(false);
    var uintArr;
    //Will store timing data to help analyse the extracted data
    var timing = {};
    mp4boxFile.onError = reject;

    //When the data is ready, look for the right track
    mp4boxFile.onReady = function(videoData) {
      for (var i = 0; i < videoData.tracks.length; i++) {
        //Find the metadata track. Collect Id and number of samples
        if (videoData.tracks[i].codec == 'gpmd') {
          trackId = videoData.tracks[i].id;
          nb_samples = videoData.tracks[i].nb_samples;
          timing.start = videoData.tracks[i].created;
        } else if (videoData.tracks[i].type == 'video') {
          var vid = videoData.tracks[i];
          //Deduce framerate from video track