I have a versus tablet that uses double twist to play videos, I have recently bought a new Samsung tab and some files are unrecognised. I have downloaded VLC player and MX pro but still can’t play the videos. Anyhelp would be greatly appreciated. 
posted in Video Codecs
What’s the extension of the video? AVI, MKV or others?
You should make sure the file extension, then select the matching player. File types supported by players
If players support them but can’t play, maybe the videos are corrupted. You need use Data Recovery to fix them.