Plex 188.8.131.5229 on Synology DS115j to Plex App on AppleTV 4: NOW everything has to be converted
I've been able to play my content for some months until last server update with the above combination, when most (if not all) the movies on my NAS suddenly "became" unsupported and need to be converted (i.e. won't play, because the DS115j isn't powerful enough to convert them).
I also started getting the "your server isn't powerful enough" message when trying to play them from a computer (Macbook Pro Retina, High Sierra, Chrome). I've spent an hour trying to disable any kind of conversion and subtitle, but I had no luck. All of the content still works perfectly fine with Apple TV reading files from an SMB share with another road-cone app, hence I suppose the files still are supported by the Apple TV hw/sw.