videohelp[.]com/software/ffmpeg
This is the code that so many video apps that have been on GOTD use, here presented as files rather than code compiled into an app's files. IF the file names in the unpacked zip file(s) match the file names in the program folder for whatever video app, after backing up the original files [e.g. copying them to another folder], replacing those files with the newer versions *may* work to give you the benefits of the latest version of ffmpeg. If not, simply copy/paste the original files back.
Some freeware or open source video apps need these ffmpeg files in a separate folder, & then inside the app you tell it where to find those files.