MKV is a container so the video format (encoding) is inside this container. While MKV is supported, what is inside sounds like it is not.
There are long discussions about video encoding and how folk take a file that plays on a PC and then this happens.
It's not a setting, it's the encoding is not supported.
Newly installed 40D8000 stops playing video after 5 second from external hdd.
video format is mkv
file size is about 10Gig
Do I need to make a setting or this is a problem.