To install FFmpeg, you need to download the installer or the static build from ffmpeg.org ¹ ³. Then, you need to run the installer or extract the static build to a folder on your computer² ³ ⁴ ⁵. You also need to add the FFmpeg bin folder to the PATH environment variable, so that you can use FFmpeg from any terminal³ ⁴ ⁵. Here are the steps to add FFmpeg to the PATH on Windows⁵:

1. Open the Start menu and type “environment variables”.
2. Click Edit the system environment variables.
3. Click Environment Variables at the bottom of the window.
4. Double-click the Path variable in the upper portion of the window.
5. Click the New button to open a new blank line below the bottom-most path.
6. Type C:\ffmpeg\bin or the path to the FFmpeg bin folder on your computer.
7. Click OK to save the changes.

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Configure FFmpeg on yt-dlg

Another option to configure ffmpeg on yt-dlg is go,

Setting -> Options -> Extra tab and set --ffmpeg-location <PathToFFmpegBinFolder> for example:

--ffmpeg-location "C:\ffmpeg\bin"

Read more: Post-Processing⁶