Free download this video streaming app at http://www.airplayit.com/
Air Playit is a pretty good audio video streaming app to stream any video to iPhone iPad iTouch via WiFi, 3G or 4G. It can help easily and freely stream MKV video to iPhone and instantly play AVI, M2TS, AVCHD, WMV or other videos on iOS devices without the need of format conversion via video converter and sync via iTunes.