One-page reference: retransmission (RTX) vs FEC, the three FEC mechanisms from RFC 8854, Opus in-band FEC (LBRR) vs RED (RFC 2198) vs DRED, the bitrate costs and key numbers (1% LBRR threshold, 25% cap, ~58 kbps stereo minimum, 60%->18% concealment at distance 2), the SDP negotiation lines, and the rule for when to turn redundancy on.
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