[FFmpeg-user] Multiply audio samples

Paul B Mahol onemda at gmail.com
Wed Sep 12 10:55:40 EEST 2018


On 9/12/18, Michael Koch <astroelectronic at t-online.de> wrote:
> Is it possible to multiply audio samples from two sources?
> I'd like to downconvert the 15kHz to 25kHz range to the 0 to 10kHz
> range. First apply a strong 15kHz highpass filter, then multiply the
> signal with a 15kHz sine wave (which produces sum and difference
> signals), then apply a 10kHz lowpass filter.

There is no yet amultiply audio filter, but I could write it.

Am I correct that for it you need two audio streams as input and one
audio stream as output?

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