I've always thought of there being 5 different levels of lossiness: * Understandable * Not noticeably worse "casually" (i.e. unable to distinguish which versio

I've always thought of there being 5 different levels of lossiness: * Understandable * Not noticeably worse "casually" (i.e. unable to distinguish which version it is without having heard both versions first) * Not noticeably worse * Not noticeably different * Exact This applies to video encoding also: for example, I start being able to pick up on mpeg artifacts well before I actually start being annoyed by them. They each have their roles. The question is: what encodings are most suited for what domains out of the above?