var box = require('mp4-box-encoding')

var buffer = fs.readFileSync('myvideo.mp4')
// decode any box including headers
// decode the entire moov box and its children
var moov = box.decode(buffer.slice(24, 236989))

var moov.mfhd.mtime = new Date() // Change the modification time

// now this is an encoding of the modified moov box
var moofBuffer = box.encode(moov)

// decode the contents of just the stts box
var stts = box.decode(buffer.slice(609, 625))