{"action":"created","issue":{"url":"https://api.github.com/repos/openpeer/ortc/issues/407","repository_url":"https://api.github.com/repos/openpeer/ortc","labels_url":"https://api.github.com/repos/openpeer/ortc/issues/407/labels{/name}","comments_url":"https://api.github.com/repos/openpeer/ortc/issues/407/comments","events_url":"https://api.github.com/repos/openpeer/ortc/issues/407/events","html_url":"https://github.com/openpeer/ortc/issues/407","id":139111339,"number":407,"title":"Same payload for different codecs in same RtpSender/RtpReceiver","user":{"login":"ibc","id":16191,"avatar_url":"https://avatars.githubusercontent.com/u/16191?v=3","gravatar_id":"","url":"https://api.github.com/users/ibc","html_url":"https://github.com/ibc","followers_url":"https://api.github.com/users/ibc/followers","following_url":"https://api.github.com/users/ibc/following{/other_user}","gists_url":"https://api.github.com/users/ibc/gists{/gist_id}","starred_url":"https://api.github.com/users/ibc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ibc/subscriptions","organizations_url":"https://api.github.com/users/ibc/orgs","repos_url":"https://api.github.com/users/ibc/repos","events_url":"https://api.github.com/users/ibc/events{/privacy}","received_events_url":"https://api.github.com/users/ibc/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/openpeer/ortc/labels/1.1","name":"1.1","color":"0052cc"},{"url":"https://api.github.com/repos/openpeer/ortc/labels/question","name":"question","color":"cc317c"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":12,"created_at":"2016-03-07T22:16:16Z","updated_at":"2016-04-16T11:23:29Z","closed_at":"2016-04-16T11:23:29Z","body":"NOTE: Related email posted in  https://lists.w3.org/Archives/Public/public-webrtc/2016Mar/0021.html.\r\n\r\n[draft-ietf-mmusic-sdp-bundle-negotiation](https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-27) in section 10.1.2:\r\n\r\n```\r\n   Multiple bundled \"m=\" lines might represent RTP based media.  As all\r\n   RTP based media associated with a BUNDLE group belong to the same RTP\r\n   session, in order for a given payload type value to be used inside\r\n   more than one bundled \"m=\" line, all codecs associated with the\r\n   payload type number MUST share an identical codec configuration.\r\n   This means that the codecs MUST share the same media type, encoding\r\n   name, clock rate and any parameter that can affect the codec\r\n   configuration and packetization.\r\n   [I-D.ietf-mmusic-sdp-mux-attributes] lists SDP attributes, whose\r\n   attribute values must be identical for all codecs that use the same\r\n   payload type value.\r\n```\r\n\r\nAs I explain in the email this is a no sense. At the end it basically states that there cannot be two different codecs with same `payloadType` (or same codec with different codec parameters) within the same `RtpSender`/`RtpReceiver`.\r\n\r\nThis is a pain for a SFU developer as it forces me to override the payload types of different participants in the same conference (otherwise a receiver should create different transports for each media track...).\r\n\r\nSo, what about ORTC and this topic?"},"comment":{"url":"https://api.github.com/repos/openpeer/ortc/issues/comments/210793165","html_url":"https://github.com/openpeer/ortc/issues/407#issuecomment-210793165","issue_url":"https://api.github.com/repos/openpeer/ortc/issues/407","id":210793165,"user":{"login":"ibc","id":16191,"avatar_url":"https://avatars.githubusercontent.com/u/16191?v=3","gravatar_id":"","url":"https://api.github.com/users/ibc","html_url":"https://github.com/ibc","followers_url":"https://api.github.com/users/ibc/followers","following_url":"https://api.github.com/users/ibc/following{/other_user}","gists_url":"https://api.github.com/users/ibc/gists{/gist_id}","starred_url":"https://api.github.com/users/ibc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ibc/subscriptions","organizations_url":"https://api.github.com/users/ibc/orgs","repos_url":"https://api.github.com/users/ibc/repos","events_url":"https://api.github.com/users/ibc/events{/privacy}","received_events_url":"https://api.github.com/users/ibc/received_events","type":"User","site_admin":false},"created_at":"2016-04-16T11:23:29Z","updated_at":"2016-04-16T11:23:29Z","body":"Sure, thanks."}}