Playnex is a free video player for android.

It can play almost all video and audio formats, including MKV, MOV, MP4, and more.

It supports 4K playback. It also has a built-in media library, so you can browse your files and play what you want.

In addition, it supports external subtitles, so you can download the subtitles from the movie and use them in your own language.

It also has a built-in equalizer, so you can adjust the audio to get the best sound effect.