: Simply "zipping" an MP4 file (using 7zip or WinZip) rarely reduces the size because MP4s are already compressed; you must "transcode" or "re-encode" the video to see real results.
: The industry standard for free, open-source video transcoding. It is best for advanced users who need to reduce file sizes significantly using H.264 or H.265 codecs while maintaining quality. Ruks Compressedmp4
If you are looking to compress MP4 files, professional and community-recommended tools for this purpose include: : Simply "zipping" an MP4 file (using 7zip