I know a good MKV to Samsung Converter. It can easily convert MKV, HD MKV to Samsung compatible format. It applies to all kinds of Samsung mobile phones including convert MKV to Samsung Galaxy S4, MKV to Samsung Galaxy S III, MKV to Samsung Galaxy S II, MKV to Samsung Galaxy S, MKV to Samsung Galaxy, MKV to Samsung Galaxy Tab, MKV to Samsung Infuse 4G/Epic 4G/Captivate/Vibrant/Fascinate/Mesmerize...
Besides, it also can convert other video formats including MOV, MPEG, WTV, WebM, FLV, MVI, ASF, RM, 3GP, VP8, 720p, 1080p, 1080i HD, AVCHD videos and more to various Samsung phones.Find it in Google by typing "step by step guide on how to play MKV on Samsung Galaxy S/S2/S3/S4/Infuse 4G/Tab...".