The QuickTime-based media player on macOS was removed by JDK-8145602. However, there are still a couple lingering references that weren't removed, one of which is an attempt to load the now-nonexistent libjfxmedia_qtkit library. You can see this if you run any Media program on Mac with the "-Djavafx.verbose=true" flag:
WARNING: java.lang.UnsatisfiedLinkError: Can't load library: <SDK>/lib/libjfxmedia_qtkit.dylib
The source of the problem is here:
https://github.com/openjdk/jfx/blob/master/modules/javafx.media/src/main/java/com/sun/media/jfxmediaimpl/platform/osx/OSXPlatform.java#L87
This isn't causing any real problems, but would be good cleanup.