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WebRTC - SDP has more m= line - Stack Overflow
https://stackoverflow.com/questions/54380165/webrtc-sdp-has-more-m-line
Since B has two media streams SDP will contain 4 m lines (2 per stream). In Unified Plan every single media track is assigned to a separate “m=” section. If you use multiple media tracks, multiple “m=” sections are created. Chrome is migrating to unified plan from plan-b
Why does the m= line in sdp contain a port? Isn't this ...
https://stackoverflow.com/questions/38187215/why-does-the-m-line-in-sdp-contain-a-port-isnt-this-redundant-with-candidates
"The port value is set to the port of the default ICE candidate for this m= section, but given that no candidates have yet been gathered, the "dummy" port value of 9 (Discard) MUST be used, as indicated in [I-D.ietf-ice-trickle], Section 5.1.", and "The m= line MUST be followed immediately by a "c=" line, as specified in [RFC4566], Section 5.7.
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
m= There will be a media line for each media type. For example, if your client can support real-time audio there will be an m= audio line. If your client can support real-time video there will be a separate m=video line. Each media line indicates the number the codecs that will be defined in attribute lines.
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/comment-page-1/
m= There will be a media line for each media type. For example, if your client can support real-time audio there will be an m= audio line. If your client can support real-time video there will be a separate m=video line. Each media line indicates the number the codecs that will be defined in attribute lines.
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