This is just a wondering that came up out of curiosity, so if you feel like it's too complicated to answer, don't worry about it.
It seems to me like it would be a fun challenge to try and find the 480p hex conversions like some are doing. What types of concepts do you need to understand in order to have a sense of what to look for? What things are being looked for in the hex code? If it requires understanding of advanced concepts, what research is needed?