I should check if there are existing sources or databases that can decode such filenames. Sometimes, groups that upload pirated content have specific naming conventions. For example, "PirateGroupName-Title-Year-Resolution-Codec-OtherDetails". If "phevc" is a group, maybe that's part of the name. Alternatively, "phevc" could be a misrendered or miswritten version of HEVC, like "H.E.V.C." with different formatting.