Application will open/record video from gallery/camera, after that application should automatically convert that video to audio file. I have searched a lot on google but i unable to get any solution for this. Can anyone help me on this?
There is one library that can do the trick which is called FFmpeg. you can found it here http://ffmpeg.org/ .
The best way is you can use bambuster (http://bambuser.com/opensource) which is open source and provides you code for your FFmpeg android app. so, you can easily convert your video file.