Subtitle Editor has not build for LEAP 42.3 it is available in the extra multimedia repo but there seams to have been a build issue
when I try to install it I get
:~> sudo zypper in subtitleeditor
[sudo] password for root:
Loading repository data...
Reading installed packages...
Resolving package dependencies...
Problem: nothing provides libgstreamermm-1.0.so.1()(64bit) needed by subtitleeditor-0.54.0-6.3.x86_64
Solution 1: do not install subtitleeditor-0.54.0-6.3.x86_64
Solution 2: break subtitleeditor-0.54.0-6.3.x86_64 by ignoring some of its dependencies
Choose from above solutions by number or cancel [1/2/c] (c):
how did you install subtitle editor did you ignore the dependency?
it would seam that libgstreamermm-1.0.so.1()(64bit) is not available in the main repo or in the multimedia:apps repo (from where you got Subtitle Editor)
libgstreamermm-1.0.so.1 can be found in the multimedia:libs repo but you have it disabled so enable it and install libgstreamermm-1_0-1
zypper mr -e 9
zypper in libgstreamermm-1_0-1
after re-enabeling the multimedia:libs repo I’d suggest you go in yast ->software management and from the menu select Dependencies-> Check Now
or with zypper do
sudo zypper verify
but a suggestion LEAP 15 will be out soon and it includes Subtitle Editor in the Main OSS repo why not upgrade to 15 now as more or less it’s stable (the official release should be next week) if you upgrade now while it’s in RC you can update to the release when it’s published as it will use the same repos