When you search how to change MKV video to MP4 without re-encoding, there are some programs that claim to remux MKV, but after considerable search and comparison, you will find that WonderFox HD video Converter Factory Pro does best in changing video container without encoding. This is a professional fast video converter that supports all popular video formats (like MKV to DivX) as well as some rare formats (like RMVB to MP4, XESC to MP4) and can convert MKV to MP4 without encoding. In addition, there will be no quality loss of the converted files.
Now, feel free to downloaddownload this software to remux MKV videos.