Try it with a bug-report to Synology, or install a different DLNA (upnp-av) server on it. What is displayed in this posting are not really MIME types (they are not detailed enough), the most important parts here are DLNA or upnp-av types. The DLNA server on your NAS needs to be able to understand the types the TV requests.
What I try to do is to find the right formats the TV is able to play, and a DLNA server which is delivering this without transcoding or re-encoding. The rationale is, that if I take a DVD and generate a file for streaming to my TV anyway, I want to have the right format directly, this way the DLNA server does not need to spend energy to generate the right format each time the file is watched.