“master” means testing version with bleeding-edge changes.
“gpl” means no contentious proprietary or patented software codecs.
Here’s a site, where you’ll want to get a “full-build” “release” version of the ffmpeg exe, (from which a 2022-01-10 build is what’s running on my system).
https://www.gyan.dev/ffmpeg/builds/#release-builds
I could ZIP up that 2022 version if you want an exe from well before anyone would have thought to include an OpenAI API key stealer into a random exe. But then you’d have to trust me…