change MP4 encoding crf from 18 to 15

wangzhibo

2025-08-04 f5106b912f1261fe633aa6bcdf10a4b7e74345aa

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{
    "REMOTE_SERVER_URL": "http://127.0.0.1:5000/upload_auth",
    "PROXY_SERVER_URL_PREFIX": "HTTP://proxy.parkprofile.com:"
}