Does the 2TB drive not need to be a DLNA Certified device?
Are you able to get the files on to your DNLA Server?
Another idea might be to put the video files in a root directory on the ext drive. Just a long shot.
You've probably seen
THIS link, which gives the various definitions.
As for the conversions. have you looked at MakeMKV for the disc conversions, (VLC will play .MKV files) then Any Video Converter for the final product?
Edit. Just realised that your drive is the DNLA server. Ignore my first 4 lines! Sorry. (1024)
posted 1010 on the 26th