The key insight is that you can construct an HTTP live streaming playlist that causes the player to pull lines from a series of files, concatenate them together

The key insight is that you can construct an HTTP live streaming playlist that causes the player to pull lines from a series of files, concatenate them together to form a URL then visit that URL, making it possible to exfiltrate data. It is unclear whether this is ffmpeg-specific, or something the HTTP live streaming protocol actually requires and therefore potentially of wider impact; I can't find any obvious reference to this feature with either a quick Google or a skim of the Apple RFC. Does anyone know?