title: Transforming images and mp3 files into a video file on android
body: <p>I am thinking to start the development of a new project and I have some ideas in mind, but I am not sure how much is doable in android.<br>
  The steps of the app would be:  </p>
  
  <ol>
  <li>The user selects a set of images from Gallery  </li>
  <li>The user selects an audio file from external storage  </li>
  <li>I combine the images and the sound (each image is displayed for a timeframe) into a movie file that can be exported to YouTube</li>
  </ol>
  
  <p>From my research I wasn't able to find any way to create the movie. All the answers contained links to android NDK and external codecs.</p>
  
  <p>So my question is: which would be the easiest way of making this on android?</p>