OpenCut v1.9.16

Performance Audit & Memory Leak Fixes

Critical Fixes

• /video/auto-zoom broken return — route returned {} instead of result_dict, discarding keyframes and output path entirely
• Unbounded thread spawning — _persist_job() and _schedule_record_time() spawned raw threading.Thread per call; replaced with bounded ThreadPoolExecutor(2) to prevent 200+ thread leak under batch load
• Rate limit slot leak — make_install_route() permanently lost rate_limit slot when rate_limit() returned False, eventually blocking all model installs until server restart

Memory & GPU Fixes

• GPU memory leak in audio_enhance — CUDA tensors not fully released between calls; now moves tensors to CPU, deletes all refs, then clears cache
• Color match frame buffer waste — BGR frames kept alongside YCbCr copies (~124MB at 1080p); freed immediately after conversion
• SQLite connection leak — thread-local connections in job_store.py never closed on shutdown; added connection tracking and close_all_connections()

Thread Safety & Stability

• Timer thread spam — temp file cleanup spawned new threading.Timer per retry (300+ threads on Windows batch cleanup); replaced with single background worker thread
• Haar cascade race condition — auto_zoom._get_cascade() wrote global singleton from multiple threads without locking; added double-checked locking
• CEP health timer leak — setInterval reassigned without clearInterval on failure, accumulating parallel health check intervals

Code Quality (Prior Session Merge)

• subprocess.run(check=False) added across all bare subprocess calls
• Exception chaining (raise ... from err) for proper tracebacks
• contextlib.suppress replacing bare try/except: pass patterns
• Import ordering cleanup (make_install_route hoisted to top-level imports)
• FFmpeg dependency check robustness (returncode + version validation)
• audio_suite.measure_loudness() now raises on ffmpeg failure
• Clip-notes example plugin upgraded to SQLite storage with legacy JSON compat
• CEP panel: workspace state persistence, theme/style overhaul
• New tests for loudness failure and ffmpeg dependency edge cases