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FindRTXPayloadType compared the whole fmtp line with "apt=<pt>", so an RTX codec negotiated as "apt=96;rtx-time=3000" (RFC 4588) was never found. The down track then stored RTX payload type 0, sent retransmissions on the primary SSRC and probed with padding even though RTX was negotiated. Compare only the apt parameter of the fmtp line.