import com.coremedia.iso.IsoBufferWrapperImpl;
import com.coremedia.iso.IsoFile;
import com.coremedia.iso.IsoOutputStream;
import com.googlecode.mp4parser.authoring.Movie;
import com.googlecode.mp4parser.authoring.Track;
import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder;
import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator;
import com.googlecode.mp4parser.authoring.tracks.AppendTrack;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedList;
import java.util.List;

/**
 *
 */
public class Concat {
    public static void main(String[] args) throws IOException {

        Movie video1 = new MovieCreator().build(new IsoBufferWrapperImpl(readFully(Concat.class.getResourceAsStream("/76.mp4"))));
        Movie video2 = new MovieCreator().build(new IsoBufferWrapperImpl(readFully(Concat.class.getResourceAsStream("/7.mp4"))));

        Track v1 = video1.getTracks().get(0);
        Track v2 = video2.getTracks().get(0);

        video1.setTracks(new LinkedList<Track>());
        video1.addTrack(new AppendTrack(v1, v2));

        IsoFile out = new DefaultMp4Builder().build(video1);
        FileOutputStream fos = new FileOutputStream(new File(String.format("output.mp4")));
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        out.getBox(new IsoOutputStream(bos));
        bos.close();
    }


    static byte[] readFully(InputStream is) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[2048];
        int n = 0;
        while (-1 != (n = is.read(buffer))) {
            baos.write(buffer, 0, n);
        }
        return baos.toByteArray();
    }
}