Let's say you're running a podcast hosting platform, or a social network. A user uploads a 40-minute interview in uncompressed format (WAV). Before anyone can hear it, your app needs four things that did not exist a second ago: a 30-second preview for the feed, waveform data so the player can draw something, transcoded variants in Opus, MP3, etc., and the whole thing loudness-normalised, because half of what people upload is recorded too quiet (or too loud). None of that i...