- this works very slowly, so I wouldn't recommend for actuall use
- Wallpaper adress must be set in code (currently on line 66)
Some code is taken from hsetroot and https://batchloaf.wordpress.com/2017/02/12/a-simple-way-to-read-and-write-audio-and-video-files-in-c-using-ffmpeg-part-2-video/