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These are probably the best places 1. In the up stream - https://github.com/livekit/livekit/blob/56dd39968408f0973374e5b336a28606a1da79d2/pkg/sfu/buffer/buffer.go#L291 - these are RTP packets 2. In the down stream - https://github.com/livekit/livekit/blob/56dd39968408f0973374e5b336a28606a1da79d2/pkg/sfu/pacer/base.go#L59 - header and payload would need to be marshalled into an RTP packet.