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Fix video freeze on late-stream joins, real A/V sync - #2
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video render freeze still open; debug logging kept in on purpose
- Tighten the decode gap check from 1s (measured against the last keyframe) to 100ms (measured against the last decoded frame) - the old threshold let discontinuous frames reach the renderer, which is the likely cause of the canvas silently freezing after a mid-stream join - Pace audio decode/schedule off the video render clock instead of firing on arrival, so audio and video actually reflect the same position instead of audio racing ahead - Shorten engine GOP to ~2s (-g/-keyint_min) to bound late-joiner wait further, on top of the existing keyframe cache - Add dashboard test infra (vitest + testing-library), wire lint/test into CI - Strip debug instrumentation, remove leftover FPS overlay from ParticleBackground
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Summary
-r <fps>) in the ffmpeg transcode — source was silently 25fps while pacing assumed 30fps, playing back ~20% too fast