Mux change history: Elevated error rates for video ingest and playback for assets and live streams

Mux reported a major outage with elevated video ingest and playback error rates affecting Mux Video - Live and Mux Video - VOD. It started at 2025-09-22 16:44 UTC and was resolved at 2025-09-22 21:36 UTC, lasting 4 h 51 min. Mux implemented a fix but did not state a root cause.