[FFmpeg-user] delay time in live ultrasound converter

[Michael Koch]

Am 18.04.2020 um 19:30 schrieb Michael Glenn Williams:
> Wow that is so cool! Will ffmpeg generate ultrasound sounds to, or do we
> know of a plugin or other that could do that, then feed the signal to
> ffmpeg?

Sure, you can generate ultrasound with FFmpeg. Try the first example in 
chapter 3.24.
Of course, the frequency must be smaller than half the sample rate. Make 
a 12kHz sine file and then try to convert it down to 2kHz.

Michael