Which versions of ffmpeg does ffmprovisr support?

Which versions of ffmpeg does ffmprovisr support? For example, I'm using ffmpeg 4.3.4 on Debian buster, and I see ffmpeg 5.0.1 was released on 2022-04-04.

Is there a range of versions that ffmprovisr recipes should work with? Maybe 4.3.x and above?

If maintainers can consense on a range, I suggest that support window be added to the last paragraph in the "Making FFmpeg Easier" section at the top of the page, or the footer, and I suggest it be added to the README in the [Guidelines for contributing](https://github.com/amiaopensource/ffmprovisr#guidelines-for-contributing).