FYI, after updating to TW 20151012 Gnome 3.18 I was no more able to watch mp4 videos with Gnome Videos (Totem).
I found that uninstalling gstreamer-plugins-vaapi 0.6.0 from the Factory-OSS repo restored videos as usual.
The side effect is that, ironically, I have two graphic chips capable of video acceleration but have to resort to the CPU to play mp4 trailers 
BTW, many gstreamer codecs have been updated from the Packman essentials repo during the same zypper dup.
Apparently, with vaapi installed, the system is not able to find a drm driver to write to the active display.
The multiplex stream is successfully decoded and audio played without problems.
A screencast that doesn’t need video acceleration ( .webm file, VP9 codec) plays OK even with vaapi installed.
It would be interesting to know if something similar is happening to KDE users too.