Live Streaming & Premieres
RTMP
Also called: Real-Time Messaging Protocol, RTMPS
Real-Time Messaging Protocol dates back to Flash. It survived because it does one job well: send a continuous audio and video stream from an encoder to an ingest server with low latency. You point the encoder at a server URL, paste in the stream key from the Live Control Room, and it connects. RTMPS is the same thing wrapped in TLS on port 443, which is what YouTube expects for a secure connection, and YouTube also accepts HLS ingest for HDR and for codecs RTMP cannot carry. That costs you latency, because HLS sends segments instead of a continuous stream.