$ git clone -n https://src.fedoraproject.org/rpms/libmp4v2.git /var/lib/mock/f31-build-69640-30332/root/chroot_tmpdir/scmroot/libmp4v2
Cloning into '/var/lib/mock/f31-build-69640-30332/root/chroot_tmpdir/scmroot/libmp4v2'...
$ git reset --hard c60037f971735d1dfb10fd7e22381f436a975274
HEAD is now at c60037f - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild