fMP4

Bilibili Tech

Aug 19, 2022 · Backend Development

Bilibili's Engineering Practices for HLS (fMP4) Live Streaming

Bilibili migrated its massive live‑streaming infrastructure from RTMP/FLV to MPEG‑TS‑free HLS using fragmented MP4, designing clustered slicing, dynamic back‑source selection, 1‑second key‑frame segments, cache pre‑warming and replay playlists, thereby cutting start‑up latency, supporting modern codecs, DRM and future immersive audio features.