$ git clone -n https://src.fedoraproject.org/rpms/ffmpeg.git /var/lib/mock/f40-build-1817426-24911/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/f40-build-1817426-24911/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin 69d06fe675bcba901ca356f8ae5346afc998a3df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpeg
 * [new ref]         69d06fe675bcba901ca356f8ae5346afc998a3df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69d06fe Backport fixes for Mesa 24.0.6+ / 21.1.4+ changes for VA-API