title: Converting audio on android to mp3 or AAC
body: <p>I am recording audio from mic and save it to .mp4 - it is AMR format. How to convert this audio to mp3 or AAC?
  I saw <a href="https://stackoverflow.com/questions/3641920/how-to-encode-a-wav-to-a-mp3-on-a-android-device/">this</a> post and I did not understand it - I am new in android.</p>
  
  <p>Is there some easy library for android that can work with mp3? I googled whole day and not found nothing. Maybe some good man can explain and give full example in this post and hundreds of people will be grateful!</p>
  
  <p>Thank you.</p>