Cannot play this file

i rip all my original DVDs the same way. I transfer them to my cloud device the same way. I can play all of them on my iPad ok, but when I use my smart DVD player connected to my wired network, I can select the we mycloud source at the bottom of the screen and I can see the video files in the videos folder, but I have some that are missing. I can see those missing files in the shared videos folder but I get a cannot play this file error when I select it, yet all the files in the root video folder play without error. Any suggestions to what differentiates the files from the rest?

Sorry, but what does this question have to do with the My Cloud Mobile Apps?