ffmpeg is an open-source command line tool to convert multimedia between formats. It can be downloaded as a pre-built binary, built directly from the source code or installed using Homebrew (macOS).
This guide will describe installing the pre-built binaries from gyan.dev (Windows) or evermeet.cx (macOS).
Additional download locations for pre-built binaries can be found on the offical FFmpeg website.
Installing ffmpeg
Download the latest static build of ffmpeg for Windows or MacOS. A recent release build is recommended (e.g. 6.1.1, 7.0.1 or similar numbering)
Extract the contents of the zip file to a location on your harddrive (e.g. D:/ffmpeg)
Launch Keyframe Pro 2 and open the Preferences dialog from the main menu (Edit->Preferences)
Select Export from the sidebar
Press the Browse button in the FFmpeg Path section
Windows: Navigate to the bin folder in the extracted directory and select ffmpeg.exe
macOS: Navigate to the extracted directory and select the ffmpeg executable