Here's a google how to use this freebie.
Yesterday, I wanted to play MKV file on my PS4, but it can't work. I checked my PS4, it can play other MP4 video. So I guess my PS4 was unharmed. I searched online. It told that to convert MKV to PS4 since PS4 cannot compatible with MKV and it recommend many PS4 converters. I don't know which one is better and I don't like any the third party software.
So I write here for other solutions, pls help me if you know any method， thanks！
Link to specific third party solution, that the poster apparently didn't like, removed by moderator.