Why can't I play MP4/H264 on my tv box?



I use the DLNA function from PMS to watch movies on my TV box (from ISP). But I can only play my .MKV files. My .mp4/h264 files wont play, they are greyed out.

I get this from my DLNA server GetProtocolInfo:

I hope one of you can help me out and play my movies.


BTW. I had to fall back on DLNA because my TV doesnt work as is used to do. therefore i couldn't use my chromecast anymore. So the only option is DLNA