FFMpeg

• FFmpeg - Ultimate Guide

FFmpeg is a free, open-source software project comprising a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool, designed for processing video and audio files. It is widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post-production effects, and standards compliance (SMPTE, ITU) FFmpeg

Converting MOV to MP4

• (Remuxing, No "Encoding")
• Runs super fast (less than a second)

ffmpeg -i file.mov -c copy out.mp4