title: FFMPEG: convert a mp4 to mp3 using ffmpeg-android ndk
body: <p>I want to convert a video file of <code>mp4</code> format to audio file of <code>mp3</code> format. It is simple through command line but i cannot find how can i convert it through <code>jni</code>. Not sure which library and which function to call. Any help regarding this issue would be much appreciated.</p>