MP4 is good for enjoy high definition movie, but mkv is better.If you have lots of MP4 movie and want a great movie enjoyment, you can try convert mp4 to mkv by " mkv video converting software" which can convert most used video format to MKV directly without compression, such as avi to mkv or mov to mkv.
Steps for how to convert MP4 to MKV.
Before converting mp4 to mkv,we should download this mp4 video converter, open it.
1 “Add File” to import mp4 video. Remember, you need to go to “Option” >> “HD Settings” by Hammer icon, and choose “SD to HD” and “Picture Enhancement”.