PWPlayer

PWPlayer is a powerful video and music player for Android.
PWPlayer is what I would say the best video player replacement application available for Android, with a lot of useful features and a nice and clean interface it greatly improves on Android's built-in video player.
This app does only play what your phone already supports. It could however be used as a video library browser because it allows you to open videos with other applications. You can even select which application you want to use by default in preferences.

Key Features:
- plays mp3, mp4/m4a (incl. alac), ogg, wma*, wav,rmvb,avi and so on
- many band optimized graphical equalizer for all supported formats, presets, custom presets
- separate powerful Bass and Treble adjustment
- stereo eXpansion, mono mixing, balance
- gapless
- replay gain
- plays songs from folders and from own library
- dynamic queue
- support music and video playlists
- Beautiful cover art animation
- a widget
- configurable lock screen
- music and video path's editor
- fast library scan
- and some personality settings