The getStats results for inbound RTP have no codec information. This differs from the outbound stats, where it is possible to map the codecId to the codec using the payload type number in the SDP (e.g. RTCCodec_OutboundVideo_99 can be mapped to a=rtpmap:99 H264/90000 in the SDP). On the inbound RTP connections, codecId isn't specified and no other codec information is apparent.