title: IDR and non IDR difference
body: <p>What is the difference between IDR and non IDR frames?</p>
  
  <p>What are 
  "coded slice of non IDR picture" , 
  "Coded slice Data partition A",
  "Coded slice Data partition B",
  "Coded slice Data partition C",
  "Coded slice of an IDR picture" ?</p>