The queues run the engines under pythonw.exe (no console). A console-subsystem child spawned by a
console-less parent without CREATE_NO_WINDOW makes Windows allocate a NEW console and SHOW it - one
visible window per ffprobe/ffmpeg call (measured 2026-10-11: Windows Terminal windows titled with the
ffmpeg binary while two encodes ran).
Fixed: transcode.run(), library_run.run()/run_watched() and the three gate helpers that call ffmpeg
directly (SSIM filtergraph, per-offset pairs, VMAF).
Proof (cache/scratch/nowin_test4.py, run in a DETACHED pythonw: GetConsoleWindow()==0, like the
engine): raw Popen without the flag -> 1 new visible console window; with the flag -> none) -> 0;
transcode.run() -> 0 windows, library_run.run() -> 0, library_run.run_watched() -> 0.
hoelee
cb6c5f644e