MX Player Pro

MX Player Pro is the best video player for Android with support for decoding video streams using more than one core. Convenient control system, supports working with subtitles.

MX Player for Android can play almost all video files: .3gp .avi .divx .f4v .flv .mkv .mp4 .mpeg .mov .vob .wmv .webm .xvid and others. And of course it recognizes most subtitle files: .srt .ssa .ass .sub .smi .mpl .txt .psb and Matroska Subtitle Track (mkv).

About Features:

Processor-optimized - contains codecs and rendering engines optimized for processors including ARM® NEON™ and NVIDIA® Tegra™ 2.
Multi-core decoding - MX Player is the first video player of its kind on Android with multi-core decoding. Tested on dual-core devices for up to 70% increase in performance compared to single-core decoding.
Clear text - improving subtitle readability by adjusting borders and shadows.
Scrolling subtitles - quickly move between subtitle texts and change their position.
4 video display options: original scale, fill, stretch, and trim.