Not really related, but a while back I wrote a script to visualize/hear audio generation loss with different file formats:

https://github.com/skratchdot/audio-generation-loss/tree/mas...

So, mp3s add a bunch of silence to the beginning of the file, and ogg files start to "chirp". I never got around to putting this info in a consumable, easy to understand format though. The videos in these folders just continuously re-encode a source file w/ a given lossy format.

See also: https://en.wikipedia.org/wiki/Generation_loss