changing region code in MKV file !

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our multi media professor gave us a mkv file and told us that it have a region code on its first byte of the file ! we should change this region code to 0 so that we could play it on any region ! the problem is when i change the first byte of the file get corrupted ! i think that te region code is not on the first byte ! so the the question is where is the region code byte?
can anyone explain a little about mkv format (i mean how does it decode the video etc.) and tell me where is the region code in mkv file? does it have a constant place?
here is the code :

C++

#include <iostream>
#include <fstream>
using namespace std;
ifstream::pos_type size=50000;
char * memblock;
int main(){
    fstream file;
    //opening file
    file.open("a.mkv",ios::in|ios::out|ios::binary);
    //size=file.tellg();
    /*
  memblock =new char [size];
    //set the pointer to the begging of the file
    file.seekg(0,ios::beg);
    //reading frome file
    file.read(memblock,size);
    for (int i=0;i<size;i++){
        cout<<memblock[i];
    }*/
     file<<"0";
    file.close();
    return 0;
    
}

note that the part that is between the /* and */ is the code that i have used to see the bytes of the mkv file ! i just want to change the region code !
note 2 : i am using Xcode and mountain lion OS !

Posted 25-Apr-13 8:11am

Mohammad Mahdi Nejati

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lewax00 25-Apr-13 16:22pm

To my knowledge, no video file formats have region codes. Physical media, like DVDs, do however.

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Mohammad Mahdi Nejati · Answer 1 · 2013-04-25T21:19:00

Solution 2

i agree with you ! but that what our professor told us ! so the question is if it not in the first byte where it is?
by the way thank;)

Posted 25-Apr-13 21:19pm

Mohammad Mahdi Nejati

OriginalGriff · Answer 2 · 2013-04-25T08:19:00

it is entirely possible that what you are writing is causing the problem: you aren't writing a zero byte, you are writing a '0' character which is a very different value.
Try this instead:

C++

file << (unsigned char) 0;

However, I do not think that the first byte of the file is a region code - it doesn't appear to be described as such in the container specification: http://matroska.org/technical/specs/index.html[^]