Comment # 25 on bug 1219494 from Michael Pujos

Yes, libmfx1 must be added as a (x86_64) runtime dependency of packages that
are now using libvpl as a compile dependency.

However, I could not find a single package that depends on package
libmfx-gen1_2 ('zypper se --requires --recommends libmfx-gen1_2' give no
result). 
I could verify that FFmpeg QSV decoding (the Packman version that is already
using only libvpl) does not need it. 
So it is a bit obscure what libmfx-gen1_2 is doing to me.

Since you reverted the removal of libmfx, you can also reinstate it for use in
VLC (as a compile dep) until enventually VLC supports libvpl.