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docs(ytwa): Add audio channel limitations and reliability warnings

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2026-04-05 11:49:33 +03:00
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@@ -457,6 +457,27 @@ DataChannel is created on the publisher PeerConnection and becomes available on
- **Payload Type:** 101
- **Format:** `111/111` (Opus redundancy)
### Audio Channel Limitations
**WARNING:** Audio channels are unreliable for data transmission through Yandex Telemost SFU.
**Observed Issues:**
- Severe signal degradation (>95% energy loss)
- Opus codec applies aggressive voice optimization
- Automatic gain control destroys non-voice signals
- Voice activity detection (VAD) filters out data tones
- Noise suppression corrupts encoded data
**Test Results:**
- Transmitted signal energy: 0.4973 (normalized)
- Received signal energy: 0.0031-0.0125 (99% loss)
- DTMF tones: Not detectable after transmission
- ggwave encoding: Completely destroyed by codec
**Root Cause:** WebRTC audio pipeline optimized for human voice, not arbitrary data. The Opus codec with DTX, FEC, and server-side processing makes audio channels unsuitable for data encoding schemes (FSK, DTMF, ggwave, etc.).
**Recommendation:** Use DataChannel for reliable data transmission. Audio channels should only be used for actual voice communication.
## Video Codec Configuration
### Supported Codecs