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  2. SDP

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SDP

SDP (Session DescriptionProtocol - протокол описания сессии) - это текстовый формат для описанияpeer-to-peer-соединения. SDP содержит описаниекодеков, адрес источника и информацию для синхронизации аудио и видео.

Here is a typical SDP message:

   v=0   o=alice 2890844526 2890844526 IN IP4 host.anywhere.com   s=   c=IN IP4 host.anywhere.com   t=0 0   m=audio 49170 RTP/AVP 0   a=rtpmap:0 PCMU/8000   m=video 51372 RTP/AVP 31   a=rtpmap:31 H261/90000   m=video 53000 RTP/AVP 32   a=rtpmap:32 MPV/90000

SDP is never used alone, but by protocols likeRTP andRTSP. SDP is also as component ofWebRTC, which uses SDP as a way of describing a session.

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