How to prepare data for a neural network?

Question

Machine learning

I often see news/videos about networks that process pictures/videos/music/text. Actually with images and text it is clear how the preparation takes place. And how do neural networks process music so that the output is the same file that can be played by the player?

Answer 1

Learn file formats, open them with a hex editor

Answer 2

Decomposition of the data structure.
Then back.