When I connect OBS via the simple-whip-server to Janus I am seeing the following error logged by Janus:
[ERR] [sdp-utils.c:janus_sdp_get_codec_pt_full:791] Unsupported codec ‘none’
[WARN] Couldn’t find codec we needed (none) in the offer, rejecting video
You’re very likely trying to publish to a room where you didn’t add h264 to the list of supported videocodecs. The sample room we have in the sample configuration file (1234) only accepts VP8.