Since "Solid Post" is often used in the scene to confirm a high-quality or working upload,
: This indicates it is a "Digital Layer Multiplex," meaning the video was likely taken from a high-quality web source (like iTunes or Amazon) and "muxed" (combined) with other audio tracks. 720p : High-definition resolution (1280x720). _DLMux_720p_-_-_Ita_Aac_Elementary_S01E23-24_-_...
It looks like you're referring to a release tag for a specific download of the TV show , specifically the Season 1 finale episodes 23 and 24 ("The Woman" and "Heroine"). Since "Solid Post" is often used in the