Discussions
H264 Codec Negotiation Issue – Missing FMTP in SDP Offer
12 days ago by dh.no
Hello,
We're experiencing an issue with SDP negotiation when using Unity WebRTC. The SDP offer generated by the server includes H264 (payload type 102), but the fmtp attribute (e.g., packetization-mode, profile-level-id) is missing.
Unity requires these parameters for codec matching. Without a=fmtp:102, Unity automatically disables the video track (m=video 0) in the answer.
Could you please update the SDP offer to include the proper FMTP line for H264?
Example:
a=fmtp:102 packetization-mode=1;profile-level-id=42e033
Thank you!