This is to generate MPEG-DASH stream with MP4box on node.js. It's simply approach, but we cannot use webm container. I use ffmpeg for MPD generation now.

mp4box.js

function runMP4box(files) {
	const args = ['-dash', '2000', ...files, '-segment-name', 'seg', '-out', 'dash/test.mpd']
	console.log(args)
	const mp4box = spawn('mp4box', args)
	return mp4box
}

function runMP4boxAsPromise(files) {
	return new Promise(resolve => {
		const mp4box = runMP4box(files)
		mp4box.on("close", resolve)
	})
}