title: How to play partial mp4 file in android
body: <p>i am stuck in a weird situation, as i am developing an android app which decrypts video at run time and plays it. Decryption process is already optimized and i am using RC4 algorithm and nio channel for copying but problem is that, it still takes about 1 min 10 secs for 250mb video and my client wants it maximum 15 secs. I am thinking about a solution in which i play my video while its getting decrypted and copy but its not happening i am getting error can't play this video.  I am using VideoView to play videos. Anybody have any idea, how to achieve this. I am setting my video uri using                 </p>
  
  <pre><code>v.setVideoURI(uri);
  </code></pre>
  
  <p>I can play video if i am playing once its decrypted.</p>
  
  <p>Please help me out.</p>