asepharyana
8ee32b8df8
The Node token-bucket pacer used HEAD-drop (emit frames in arrival order, drop newer ones when over budget). Under the encoder's ~330fps burst (ffmpeg -re does not reliably throttle YouTube-DASH webm), the viewer was watching frames ~10s behind live → frozen / 'patah-patah' video while audio (not rate-limited) played current = desync. Replace it with a steady setInterval emission clock at videoFps: each tick emits exactly ONE frame — the NEWEST buffered one — and discards everything older (tail-drop). At most one frame is ever held, so no backlog and no lag; the emit clock (not the encoder rate) defines playback speed. Keyframes are never superseded so the decoder keeps getting IDRs. Audio stays in sync.