Galaxy S4 "sound and shot" feature - extract sound
When using "Sound &amp; shot" mode with the Samsung Galaxy S4 camera, the audio is stored as a WAV file that is embedded into a metadata tag within the JPEG. Here is how to extract the audio using ExifTool on a computer (not android). ExifTool can run on Unix platforms, Macintosh OS X, and Windows. If you are running linux, it might be available through your package repositories.

1) Install ExifTool on your computer.

2) Transfer the file of interest to your computer for extraction. (I'll leave that part up to you)

3) Now extract it. In my example, we assume the filename is called '20160520_061539.jpg', and the operating system is linux. You might have to  make adjustments to the process for other operating systems. In my case, the name of the tag which stores the audio is 'EmbeddedAudioFile'. To extract it, open a terminal and do:


  exiftool -b -EmbeddedAudioFile 20160520_061539.jpg > 20160520_061539.wav


You should now have a WAV audio file called 20160520_061539.wav in the present directory.