FileChannel fc = new RandomAccessFile("/media/scratch/ThreeHundredFourtyThreeMB.mp4", "rw").getChannel();
IsoFile isoFile = new IsoFile(fc);
HandlerBox hdlr = (HandlerBox) Path.getPath(isoFile, "/moov[0]/trak[0]/mdia[0]/hdlr[0]");
hdlr.setName("onetwothreefourfivesix");