Comment # 4 on bug 1172018 from Francois Gouget

Note that when I say that "registry.i586.bin is empty" I don't mean that its
size is 0 bytes. I mean that it does not contain any useful information (and
it's size is still quite small <= 25 kB instead of > 200 kB):

$ strings .cache/gstreamer-1.0/registry.i586.bin | head -n12
1.3.0
libgstcoreelements.so
Plugin for blacklisted file
/usr/lib/gstreamer-1.0/libgstcoreelements.so
0.0.0
BLACKLIST
BLACKLIST
BLACKLIST
BLACKLIST
libgstcoretracers.so
Plugin for blacklisted file
/usr/lib/gstreamer-1.0/libgstcoretracers.so

That's a clear result of the 64-bit gst-plugin-scanner being unable to 
load the libraries to see what they contain. Contrast it with the 64-bit 
file:

$ strings .cache/gstreamer-1.0/registry.x86_64.bin | head -n12
1.3.0
coreelements
GStreamer core elements
/usr/lib64/gstreamer-1.0/libgstcoreelements.so
1.12.5
LGPL
gstreamer
openSUSE GStreamer package
http://download.opensuse.org
2018-03-28
GstElementFactory
capsfilter