Define obscenity and indecency in terms of media. Is the boundary clear cut?

I'm doing a research paper and I'm trying to understand this difference myself. Different input all around would be much appreciated. Define obscenity and indecency in terms of media. Is the boundary clear cut?
In the case of Miller v. California, the Supreme Court stated that material is obscene if the average person, applying contemporary community standards (not national standards, as some prior tests required), must find that the work, taken as a whole, appeals to the prurient interest;


the work depicts or describes, in a patently offensive way, sexual conduct or excretory functions[1] specifically defined by applicable state law; and


the work, taken as a whole, lacks serious literary, artistic, political, or scientific value.