同步操作将从 Gitee 极速下载/ffmpeg 强制同步，此操作会覆盖自 Fork 仓库以来所做的任何修改，且无法恢复！！！
确定后同步将在后台操作，完成时将刷新页面，请耐心等待。
Main development, master branch after release/4.4 branched off
FFmpeg 4.4 release
FFmpeg 4.3.2 release
FFmpeg 4.3.1 release
FFmpeg 4.2.4 release
FFmpeg 2.8.17
FFmpeg 4.1.6 release
FFmpeg release 3.4.8
FFmpeg 4.0.6 release
FFmpeg 3.2.15 release
Main development, master branch after release/4.3 branched off
FFmpeg 4.3 release
FFmpeg 4.2.3 release
FFmpeg 2.8.16 release
FFmpeg 4.1.5 release
FFmpeg 4.2.2 release
FFmpeg 3.4.7 release
FFmpeg 4.0.5 release
FFmpeg 4.2.1 release
Main development, master branch after release/4.2 branched off
