Problems running 10.9.x releases

[theguymadmax]

I'm glad to hear it's working! It seems like the issue was related to how you added the environment variable. From the first screenshot, it looks like you added a new environment variable called ffmpeg with the Jellyfin directory. The correct way would be to add the directory to the existing PATH environment variable.

The FFmpeg paths specified in encoding.xml were deprecated in version 10.9. My best guess is that in version 10.8.13, the encoding.xml file overrode your system settings, but with the update to 10.9, it defaulted back to your system settings.