[Ayeceedee]

For me, it came up in a course I took last term which used the textbook "Video Processing and Communications" by Y. Wang, J.Ostermann and Y-Q. Zhang.

It's a bit out of date (2002), but the core video encoder material was solid. It's a bit heavy in representing concepts using symbolic/equation notation. That, for me, made the jump from 1D signal processing to multidimensional signal processing tougher than it needed to be.

There are probably better resources so definitely don't just take my word for it! :)

(For scabilility, IIRC the terms "enhancement layer" and "base layer" are particularly important, as are the block diagrams that generate them.)