H.264 was initially developed by ITU (International Telecommunication Union) and then published by JVT, a group combined by ITU and ISO/IEC, in 2003. H.264 is also known as MPEG-4 part 10. H.264 has a higher compression ratio than MPEG-4, and thus can further reduce bandwidth usage.
MJPEG is a video stream which is composed a series of individual JPEG images. Entire image forms an individual frames on encoding / decoding processions therefore the video sequence becomes large and increase the bandwidth and storage space
MPEG4 fits the high loading bandwidth and video streams transmitted over the Internet because of more compression efficiency. Besides few specific frame compressed entirely like MJPEG, other respective frame is compared with its previous frame and only pixel the changed parts so MPEG4 supports low-bandwidth and high quality imagine