Android : Copy RawFile to Sdcard (video mp4)

Question

What is wrong on this code ?
I\'ve a Raw file in my project (mp4 videofile),
when i do this, and then i retreive file from SDcard file are not identical so video can

Answer 1

It works,thanks

BufferedOutputStream bufEcrivain = new BufferedOutputStream((new FileOutputStream(f)));
BufferedInputStream VideoReader = new BufferedInputStream(getResources().openRawResource(R.raw.blow));
byte[] buff = new byte[32 * 1024];
int len;
while( (len = VideoReader.read(buff)) > 0 ){
    bufEcrivain.write(buff,0,len);
}
bufEcrivain.flush();
bufEcrivain.close();