Too often I come across examples like this. The difference between a hacker and a cracker is not what they do, but their attitude. I’m pretty sure this guy didn’t know about Matroska media containers as a fetus, which means he had to learn about it one day. Everyone else does too. Hackers are productive and respectable, this is an example of how NOT to behave on the internet.
Cracker? We used to call them Wizards.