ChangeInplaceExample.java

package com.googlecode.mp4parser.stuff;

import org.apache.commons.lang.RandomStringUtils;
import org.mp4parser.IsoFile;
import org.mp4parser.boxes.iso14496.part12.HandlerBox;
import org.mp4parser.tools.Path;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;

public class ChangeInplaceExample {
    public static void main(String[] args) throws IOException {
        long start = System.currentTimeMillis();
        FileChannel rChannel = new RandomAccessFile("/media/scratch/CSI.S12E21.HDTV.x264-LOL.mp4", "r").getChannel();
        FileChannel wChannel = new RandomAccessFile("/media/scratch/ThreeHundredFourtyThreeMB_2.mp4", "rw").getChannel();
        IsoFile isoFile = new IsoFile(rChannel);
        HandlerBox hdlr = Path.getPath(isoFile, "/moov[0]/trak[0]/mdia[0]/hdlr[0]");
        assert hdlr != null;
        hdlr.setName(RandomStringUtils.random(hdlr.getName().length()));
        isoFile.getBox(wChannel);
        rChannel.close();
        wChannel.close();
        System.err.println((System.currentTimeMillis() - start) + "ms");
        new File("/media/scratch/ThreeHundredFourtyThreeMB_2.mp4").delete();
    }
}