Modify mp4 - moov atom at the front of the file (Fast Start)

gistfile1.txt

//add compile 'net.ypresto.qtfaststartjava:qtfaststart:0.1.0' to build.gradle
String videoFileNameWithoutExtension = com.google.common.io.Files.getNameWithoutExtension(path2OutputFile);

File outputFile = new File(path2OutputFile); // Your outputFile file
String pathToParent = outputFile.getParent();
Path noStreamOutputFile = Paths.get(pathToParent, videoFileNameWithoutExtension + "_nostream.mp4");
Files.move(outputFile.toPath(), noStreamOutputFile); 

 try {
     QtFastStart.fastStart(new File(noStreamOutputFile.toString()), outputFile);
 } catch (QtFastStart.MalformedFileException ex) {
     Logger.getLogger(AudioVideoHelpers.class.getName()).log(Level.SEVERE, null, ex);
 } catch (QtFastStart.UnsupportedFileException ex) {
     Logger.getLogger(AudioVideoHelpers.class.getName()).log(Level.SEVERE, null, ex);
 }

 Files.delete(noStreamOutputFile);