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A <video src='../assets/foo.mp4'> inside a sub-composition silently dropped from extraction; the rendered output froze on the first decoded frame for the entire clip, with no error in stdout. Root cause: browser URL resolver clamps '..' at origin root (studio preview loads fine), but path.join(projectDir, '../assets/foo.mp4') normalizes to parent-of-project/assets/foo.mp4, which usually doesn't exist. existsSync returns false, extraction is skipped, no frame lookup is built, the per-frame injector has nothing to swap, and the <video> element's first decoded frame paints every screenshot. - Adds resolveProjectRelativeSrc in videoFrameExtractor that mirrors browser clamping (literal join first, then leading '..' stripped). - Surfaces a loud stderr warning when the resolver misses. - Mirrors fix in audioMixer.ts (same bug for <audio src='../'>) and renderOrchestrator HDR probe loop. - +6 regression tests. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>