look for libvapoursynth-script.so.0 on Linux

[Former user]

The default library name for VSScript on Linux (and similar ELF systems) is libvapoursynth-script.so.0.

libvapoursynth-script.so is a development file and may not be installed by default.

You could do an extra check like this:

--- a/common-src/vapoursynth/vs_script_library.cpp
+++ b/common-src/vapoursynth/vs_script_library.cpp
@@ -249,6 +249,12 @@
        m_vsScriptLibrary.setFileName(libraryFullPath);
        loaded = m_vsScriptLibrary.load();
    }
+#else // !Q_OS_WIN
+   if(!loaded)
+   {
+       m_vsScriptLibrary.setFileName("libvapoursynth-script.so.0");
+       loaded = m_vsScriptLibrary.load();
+   }
 #endif // Q_OS_WIN

    if(!loaded)

[Aleksey Lyashin]

In my test system (Linux Mint 19) true vsscript library is libvapoursynth-script.so.0.0.0. Both libvapoursynth-script.so and libvapoursynth-script.so.0 are symlinks to it, which is a common practice. 0.0.0 is a version, which is a subject to change. System may have several versions of the library with a symlink linking to the latest. Instead of using an unreliable workaround, you can just symlink the library yourself.

[djcj]

The thing is that on some distros this symlink is only present if you have installed the development package (libvapoursynth-dev, vapoursynth-devel, etc.). If the soname of the library is libvapoursynth-script.so.0 then libvapoursynth-script.so.0 must be present in the library search path (whether it's a link or not). I don't think you should install a dev package if you only need the runtime file. And in this case the check would only be made if "libvapoursynth-script.so" wasn't found.