From Voice to Text

Discord (Legcord)
   ↓
PipeWire graph
   ↓
discord_sink (virtual null sink)
   ↓
discord_sink.monitor (loopback source)
   ↓
whisper_mic (remap-source, mono, 16kHz)
   ↓
ffmpeg
   ↓
audio.wav (growing file)
   ↓
whisper-stream

On the device used for transcription, a Discord client (Legcord) is running and joins the session's Discord voice channel. System sound is fed by pipewire into a virtual null sink (named discord_sink) and a loopback source (called discord_sink.monitor), remapped by whisper_mic and fed into to ffmpeg. Whisper-stream uses the wav file created by ffmpeg to create the transcript. Using a minimal language model (tiny.en), the voice input is transcribed with a delay of 5 to 10 seconds.