Though iPhone 4S seems more powerful in some respects, such as dual-core A5 chip, iOS 5, 8MP camera, Siri etc. But, according to a large number of reviews, it still can’t support more video formats, the most popular video format – MKV, can’t be played well.
MKV video is popular for its high-definition video quality. We may get it by online downloading or ripping from Blu-ray discs. It supports multi-track and multi-subtitle. This format is complex that only few media players can handle it. iPhone 4S isn’t lucky.
Therefore, if you want to watch mkv videos on iPhone 4S, you have to do some work in advance. I mean you should convert MKV to iPhone 4S. In my opinion, this is the best solution currently. First of all, a suitable MKV to iPhone 4S converter should be installed on your computer. Then you can follow the steps to realize it.