Before downloading and using the .bat file, use must have installed FFmpeg (latest version) installed on your Windows computer. Once the .bat file is saved, open it with Notepad++ or your desired notepad program. After you have opened it, edit the following lines of code:
set "VIDEO_DIRECTORY=[your directory goes here]"
set "FFMPEG_PATH=[your directory goes here]"
Then save it as .bat file. Then double left click on it.
I hope this is helpful. Good Luck!