http://ffmpeg.org/download.html#build-windows
https://www.gyan.dev/ffmpeg/builds/
向下翻到release，内容类似：
release Version 4.4 Links https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z SHA256: 3b18ea042dcc0865435f1a03d2c363f7bfd7cf8b52a3081253bc9d6afd1d823f https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.7z (22MB) SHA256: d77782fa3ea48a52a52bff35637cee14143480473a590e6eb3cb97d80488a513 https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip (74MB) SHA256: b61572975ece8a3fe86bb590edb0c5681d9e85a0332b305bdcfbf299344146e8 https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full-shared.7z SHA256: 4aaf80f0ee78a9eb5a1396742fd51d1624a705bfa7ce263e9b440b8be7db5650
下载ffmpeg-release-full-shared.7z即可。
