-#Source0Download: http://downloads.webmproject.org/releases/webm/index.html
-Source0: https://storage.googleapis.com/downloads.webmproject.org/releases/webm/%{name}-%{version}.tar.bz2
-# Source0-md5: a19518c8111fa93bdabdd85259162611
+# original download URL: http://downloads.webmproject.org/releases/webm/index.html
+# ...but use github mirror to get consistent tarballs
+#Source0Download: https://github.com/webmproject/libvpx/releases
+Source0: https://github.com/webmproject/libvpx/archive/v%{version}/%{name}-%{version}.tar.gz
+# Source0-md5: 49cb591325f44a3459b040112e3b82e7