Comment # 4 on bug 1039163 from Dave Plater

(In reply to Jason Mader from comment #2)
> Definitely not using gstreamer-plugins-vaapi, if that's installed then all
> other videos that play then would report the error "Could not initialize
> supporting library."
> 
> If I install all the stuff mentioned on
> http://opensuse-guide.org/codecs.php, the MPEG-1 and MPEG-2 files still do
> not play.
> 
> But our Leap 42.2 installation is quite similar to Leap 42.1 where these
> formats do play.
> 
> Here's an example MPEG-1 that I can play on Leap 42.1, but not on Leap 42.2,
>   https://media.ccsa.gmu.edu/s/uvattjgghod1tf5/Front.mpg

You don't mention which front end you are attempting to play the videos with.
Can you post the output of zypper -si libavcodec please.