May have found an answer to this. Assuming this Version of FFMPEG in Plex - #2 by anon18523487 is still true then it appears plex uses it’s own custom ffmpeg itself so anything I configure myself should be independent of that.
May have found an answer to this. Assuming this Version of FFMPEG in Plex - #2 by anon18523487 is still true then it appears plex uses it’s own custom ffmpeg itself so anything I configure myself should be independent of that.