: The gold standard for open-source video transcoding and compression. [1, 3]

: A setting (usually between 18 and 28) that balances quality and file size. Lower numbers mean higher quality. [2, 3]

: A powerful, free tool that provides a GUI for FFmpeg functions. [2]

While "mnop_compressmp4" is not a widely known commercial software, scripts with similar naming conventions generally offer: