Download https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z
Extract it to YOUR_INSTALL_DIR\ffmpeg-4.4-full_build
where e.g. YOUR_INSTALL_DIR = C:\Program Files
Make sure the executing user of confluence can read this directory (Username is usually confluence).
You can add the executing user of confluence to the directory ACL by right-click and properties on the directory ffmpeg-4.4-full_build
Click on edit:
Image RemovedImage AddedClick on add:
Image RemovedImage AddedType the execution user of confluence and click on “Check Names”
Image RemovedImage AddedClick on ok.
Note the path YOUR_INSTALL_DIR\ffmpeg-4.4-full_build\bin\ffmpeg.exe