Missing ffmpeg

If it is a Windows system, the pre-packaged version already contains ffmpeg, no need to process. In the source code, there is an ffmpeg.7z file, which can be extracted and stored in the root directory of the software.

If it is a Linux system, the Debian system can use apt-get install ffmpeg or the Fedora system can use yum install ffmpeg to install it.

Mac systems use brew install ffmpeg to install