brew install ffmpeg始末_brew install ffmpeg 下载失败

我是mac m1，需要安装ffmpeg。

问题1
首先当然是直接brew install ffmpeg，但是报错

==> Downloading from https://homebrew.bintray.com/bottles/glib-2.68.1.arm64_big_
#=#=-#  #                                                                     
curl: (22) The requested URL returned error: 404 Not Found
Trying a mirror...
==> Downloading https://ghcr.io/v2/homebrew/core/glib-2.68.1.arm64_big_sur.bottl
==> Downloading from https://github.com/-/v2/packages/container/package/homebrew
##O=#  #                                                                      
curl: (22) The requested URL returned error: 404 
Error: Failed to download resource "glib"
Download failed: https://ghcr.io/v2/homebrew/core/glib-2.68.1.arm64_big_sur.bottle.tar.gz
1
2
3
4
5
6
7
8
9
10

第一反应肯定是brew install glib，但是我发现2.68.1这个版本哪里都下不到，下了一个2.68.0结果再次使用brew install ffmpeg，还是要升