title: how to change header info in mp3 file?
body: <p>Below are my queries.</p>
  
  <p>1.What information is there in header field of mp3 file?</p>
  
  <p>2.If i need to change like bitrate,length,is it possible to change programatically.</p>
  
  <p>3.Is it necessary that all mp3 contains id3 tag?</p>
  
  <p>4.is there anyway that if i change some info in mp3 file it cant be played and if i redo it can be played?</p>
  
  <p>regards,
  hitendrasinh gohil</p>