RetroFE forums

Not very easily. You'd have to completely rewrite the video code part of the front-end for that. Luckily it's only one or two files as far as I recall, but it's still quite a bit of work unless you're familiar with the ffmpeg library (I'm not). Are all the needed gstreamer codec plugin libraries installed?

Which fix are you referring to exactly?

https://github.com/phulshof/RetroFE

Yes. Can’t believe the issue was right under my nose, and I missed it before.

I think I see the problem already. The map is filled with case sensitive values, but the search is done using a tolower version of the algorithm in layout. Since that will never match, the algorithm will always be linear. I'll see if I can fix that soon.

The email you sent me pointed out the source of the issue to me. The if conditions were incorrect. I've fixed them in github; let me know if that works for you or not (I don't have multiple screens to test it with).
-----
@@ -131,7 +131,7 @@ bool SDL::initialize( Configuration &config )
                 Logger::write( Logger::ZONE_ERROR, "Configuration", "Missing property \"horizontal\"" + std::to_string(i) );
                 return false;
             }
-            else if ( hString != "stretch" && (i == 0 && !config.getProperty( "horizontal", windowWidth_ )) && !config.getProperty( "horizontal" + std::to_string(i), windowWidth_ ))
+            else if ( hString != "stretch" && (i != 0 || !config.getProperty( "horizontal", windowWidth_ )) && !config.getProperty( "horizontal" + std::to_string(i), windowWidth_ ))
             {
                 Logger::write( Logger::ZONE_ERROR, "Configuration", "Invalid property value for \"horizontal\"" + std::to_string(i) );
                 return false;
@@ -148,7 +148,7 @@ bool SDL::initialize( Configuration &config )
                 Logger::write( Logger::ZONE_ERROR, "Configuration", "Missing property \"vertical\"" + std::to_string(i) );
                 return false;
             }
-            else if ( vString != "stretch" && (i == 0 && !config.getProperty( "vertical", windowHeight_ )) && !config.getProperty( "vertical" + std::to_string(i), windowHeight_ ) )
+            else if ( vString != "stretch" && (i != 0 || !config.getProperty( "vertical", windowHeight_ )) && !config.getProperty( "vertical" + std::to_string(i), windowHeight_ ) )
             {
                 Logger::write( Logger::ZONE_ERROR, "Configuration", "Invalid property value for \"vertical\"" + std::to_string(i) );
                 return false;

Documentation has been updated as well. Let me know if there are implemented features missing from the manual.

I've just released RetroFE 0.10.30 to the download section. This release contains the latest memory fixes as well as a core 1.4 directory for those people who want to use gstreamer 1.4 (just rename the core directory to core 1.18 and the core 1.4 directory to core). The default core directory uses a recent gstreamer release (1.18). I will continue to release executables for the latest stable gstreamer release as well as for 1.4 until the video issues with the themes have been resolved.

I hope to update the documentation later this week. Most of the new features are already present, but some of the latest fixes may not yet be in there.

Edit: WARNING: I've replaced the 1.20 gstreamer version with the 1.18 gstreamer version again. 1.20 does not work well together with video walls for some odd reason. The sound is a huge mess.