$ git clone -n https://gitee.com/opencloudos-stream/ffmpeg.git /var/lib/mock/dist-ocs23-build-114700-7721/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-ocs23-build-114700-7721/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ffmpeg
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b4abcc !14 enable all_codecs for vulkan upgrade. Merge pull request !14 from cunshunxia/master