VLC

VLC media player is a free and open source cross-platform multimedia player that plays most multimedia files as well as discs, devices, and network streaming protocols.
VLC can play most video and audio files, as well as network streams and DVD ISOs, like the desktop version of VLC.
VLC  is also a full audio player, with a complete database, an equalizer and filters, playing all weird audio formats.
VLC is intended for everyone, is totally free, has no ads, no in-app-purchases, no spying and is
developed by passionate volunteers. All the source code is available for free.

VLC plays most local video and audio files, as well as network streams (including adaptive streaming), DVD ISOs, like the desktop version of VLC.
All formats are supported, including MKV, MP4, AVI, MOV, Ogg, FLAC, TS, M2TS, Wv and AAC. All codecs are included with no separate downloads.
VLC has a media library for audio and video files, and allows to browse folders directly.
VLC has support for multi-track audio and subtitles. It supports auto-rotation, aspect-ratio adjustments and gestures to control volume, brightness and seeking.
It also includes a widget for audio control, supports audio headsets control, cover art and a complete audio media library.