FC2Video

For more information you can go to this link: https://www.videoconverterfactory.com/tips/batch-convert-mkv-to-mp4.html

Key features of HD Video Converter Factory Pro
Convert between all mainstream audio and video formats;
Batch convert, compress, and download videos and music files;
Remux videos without quality loss;
Change video/audio parameters (resolution, bitrate, framerate, aspect ratio, etc.);
Clip and merge video files;
Hardware acceleration support.

Official software website: https://www.videoconverterfactory.com/hd-video-converter/