Calm down bleeding heart Apple boy. I didn't say a thing about Apple's codec. But since you mentioned It.
It only existed as a tool to force the sales and control of naive Apple user's purchases. Especially when using Apple software. When it's of equal quality to mp3 it was always unessisary.
Also forget Mp4. Lol the poor man's avi
Sorry, but no. I edit video for jobs, and when I have a video in 720p that I export as AVI and it's over 200 GB, well, that's no good. That's a tenth of my entire HD. So I compress it down to a high quality mp4 which reduces it to under 4 GB, with a fairly minimal loss in noticeable quality - in other words, you likely wouldn't notice it if you weren't looking for it.