change MP4 encoding crf from 18 to 15

wangzhibo

2025-08-04 f5106b912f1261fe633aa6bcdf10a4b7e74345aa

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rem pyinstaller --exclude-module PySide6 --add-data "../auto_media_publisher/utils/stealth.min.js;auto_media_publisher/utils" --noconsole --onefile ../auto_media_publisher/win_client/sening_vlh.py
pyinstaller --exclude-module PySide6 --add-data "../auto_media_publisher/utils/stealth.min.js;utils" --onefile ../auto_media_publisher/win_client/sening_vlh.py