Comment # 1 on bug 1039163 from Vasilis Liaskovitis

Have you tried adding the extra repos and packages described in this link? :
http://opensuse-guide.org/codecs.php

I also guess you are not using gstreamer-plugins-vaapi for h/w video decoding?

If the problem persists: A link to a test video with the exact format you are
trying might be helpful for reproducing.