I know that we learned to translate ancient Egyptian mostly from artifacts like the Rosetta stone. But that was translating written text. Do we know what ancient egyptian sounded like as well? If we do, how did we figure that out?

Disclaimer: My question is based entirely on those scenes from the old Brendan Fraiser Mummy movies where Johnathan is reading spells from the Book of Life and can't figure out how to pronounce the Stork Hieroglyphic. So my question could be completely wrong.