MKV and MP4 file formats are your typical file types for digital audio and video files. There are numerous players to open these types of file formats but you may enjoy the mp4 format more. MKV also known as matroska multimedia container is an open format that allows users to pack in audio, video and subtitle tracks all into one file. Mpeg or mp4 is also very similar in fashion and allows users to do the same. For those who prefer to convert to their liking, SDR Free MKV to MP4 Converter works like a charm. With very little to no loss in quality you can quickly convert your mkv to mp4. By watching the progress bar, you will be able to see exactly when your file is converted.