A big project was merged into FFmpeg overnight in providing a WHIP muxer for sub-second latency streaming.

WHIP stands for the WebRTC-HTTP Ingestion Protocol and is a low-latency live-streaming specification building off WebRTC. WHIP uses HTTP for exchanging initial information and capabilities and then uses STUN binding to establish a UDP session. Encryption is supported -- and due to WebRTC, mandatory -- with WHIP and audio/video frames are split into RTP packets.

WebRTC-HTTP Ingestion Protocol is an IETF standard for ushering low-latency communication over WebRTC to help with streaming/broadcasting uses.