That’s for SLE12, not openSUSE.
Should work in this case, but it’s not advisable in general to install packages from other distributions.
But as I wrote, the problem is fixed already, all ffmpeg packages have been rebuilt to use libx265-95.
At least packman.inode.at (the mirror I use) and gwdg.de do provide the new packages already.
So, installing libx265-87 should not be necessary any more.
As you will have read, in the meantime, all is settled, thus no need to point to any RPMs, because all will work automagicaly again.
BTW, you already mixed SLE with openSUSE. Please try to find out what the difference is and that this here are the openSUSE forums and how the correct spelling of openSUSE is.