For all of those complaining about not getting audio or other issues, please install these players that support all kinds of files. No problems with them.
https://play.google.com/store/apps/details?id=com.mxtech.videoplayer.ad
https://play.google.com/store/apps/details?id=video.player.videoplayer
https://play.google.com/store/apps/details?id=com.mxtech.videoplayer.ad
https://play.google.com/store/apps/details?id=video.player.videoplayer