MX Player

MX Player is a all-in-one media player which supports most known video formats. Recently, the player began to support hardware and multi-core decoding.
This player independently collects video from all folders on the device and the external memory card, if you have one, and divide movies by folders (for ex. camera, external memory card, series of TV shows). The menu has a search function, including the voice search.
New videos are tagged by mark "New!", the title of viewed files becomes gray and light contrasted with the others. Playback of each file is stored, and if you quit watching of a few movies in the middle, you can always go back to watching from the place you stayed.

Control is made by intuitive gestures during the watching. Left vertical swipe is responsible for setting the display brightness, right vertical swipe controls sound of played video. The scale can be adjusted both by button in the lower right corner and by fingers. As in most players, there is a familiar scrubbing line on the left side of the playing movie, on the right side there is the total duration.

The player supports the most famous subtitle formats such as txt, srt, ssa / ass, sub, mpl, and some others. Directly from the player, during the movie watching, you can change the audio track, if it is supported by the video file.
The player has a smart lock that prevents inadvertent pressing of the buttons in the case of contact of display with the water or if the child will take the device.
Because the application is distributed for free, pausing the movie, you'll see a small ad at the top of the image.

It's a great player, probably one of the best for mobile with Android on board. If you constantly have problems with playing of the videos, you should try to put this app at the first place.