This is a sanitized engineering note about server-side audio noise reduction for WebRTC calls.

Source article:

https://www.lodan.me/posts/server-side-webrtc-noise-reduction-pion-ffmpeg-rnn/

What the prototype tests

The goal is not to replace WebRTC's built-in audio processing. The narrower test is:

receive a WebRTC Opus track with Pion

read RTP packets in OnTrack

decode Opus payloads to PCM

pipe raw PCM into FFmpeg

apply the arnndn RNN noise reduction filter

validate the output as a file before considering real-time forwarding

Why this boundary matters

RTP, Opus, PCM, and FFmpeg raw audio input are different boundaries.…