Mux change history: video clips audio loss

Mux Video - VOD had major audio loss affecting some clips using "basic" or "premium" video_quality, caused by an encoding-change metadata mismatch. It started 2026-03-06 22:57 UTC and was resolved 2026-03-07 01:57 UTC (3 h 0 min); new clips work, but affected clips require re-creation from original assets to restore audio.