Converting .mjpg videos to .mp4 format.
Converting Motion JPEG Videos directly to MPEG-4 Videos (.mjpg to .mp4 conversion) is possible and should be quite straightforward.
Try using a video editing software or (online) conversion tool, such as the Freemake Video Converter or MediaCoder, which allow users to import MJPG videos and export them in MP4 format.
One of the most popular and successful free video conversion softwares
A free universal media transcoder for Windows