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VideoCache.download() opened the connection with URI.create(url).toURL() on the raw URL. URLs whose path has non-ASCII segments (e.g. the Korean ".../음악퀴즈/...") were sent unencoded, so the server answered HTTP 400 and every preload aborted — the disk cache stayed empty and clients fell back to live streaming for every video (instant on a fast host, 10s+/no-show on a slower remote client). FFmpeg tolerates the raw URL, masking the bug at playback time. Encode only the bytes put on the wire; the READY key, sha256 filename, and lookup() all keep the original url string so cache hits still match the anchor's raw URL. Verified: raw URL -> HTTP 400, encoded -> 200. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>