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Miguel Ángel
764755b23e
Adds a strict sync tier to the runtime-owned media path that catches accumulated drift from repeated pause/play toggling. Previously, drift below 0.5s persisted indefinitely (only the 3s catastrophic valve would correct it). For speech-driven videos where narration, captions, and visual timing need to stay aligned, this caused audible desync. The fix adds three mechanisms: 1. **Strict sync (80ms, consecutive-sample gated)**: when the timeline- to-media offset has stabilized (not growing from initial buffering) and drift exceeds 80ms for 2 consecutive ticks, force a currentTime correction. This mirrors the parent-proxy path's 50ms threshold with consecutive-sample gating (MIRROR_DRIFT_THRESHOLD_SECONDS). 2. **forceSync on transitions**: play/pause toggles, seek, and playback- rate changes set a one-shot flag that forces an immediate sync on the next tick, bypassing all thresholds. This prevents drift from accumulating across pause/play cycles. 3. **Buffering guard**: strict sync only fires when the offset has stabilized (delta < 4ms/tick). During initial buffering, the offset grows ~16ms/tick as the timeline advances while media stays at 0 — this gradual growth is not corrected, preserving the existing behavior of not skipping opening audio. Closes #668 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>