You can generate .wav files with all sorts of modulation methods centered at the frequency of your choice with transmission measure in kbps with https://github.

You can generate .wav files with all sorts of modulation methods centered at the frequency of your choice with transmission measure in kbps with https://github.com/quiet/quiet https://github.com/quiet/quiet which provides a wav file encoder. You could then just add this wav on top of your video. And if you're really feeling adventurous libquiet provides floating point output that can be put into any channel like video if you're willing to plumb it in there. </plug>