RTP, RTCP, and RTSP - Internet Protocols for Real-Time.
Padding may be needed by some encryption algorithms with fixed block sizes or for carrying several RTP packets in a lower-layer protocol data unit. extension (X): 1 bit If the extension bit is set, the fixed header is followed by exactly one header extension, with a format defined in Section 5.3.1.
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The following sections describe some aspects of the use of RTP. The examples were chosen to illustrate the basic operation of applications using RTP, not to limit what RTP may be used for. In these examples, RTP is carried on top of IP and UDP, and follows the conventions established by the pro le for audio and video speci ed in the companion.
RTP payload. The data transported by RTP in a packet, for example audio samples or compressed video data. RTP session. The association among a set of participants communicating with RTP. For each participant, the session is defined by a particular pair of destination transport addresses (one network address plus a port pair for RTP and RTCP).
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If RTP is used with a protocol that is not message-based (e.g., TCP) or if it is desirable to carry several RTP packets in one lower-layer PDU (e.g., for aggregation of streams), it is trivial to define a profile that prefixes the RTP header by a 16 or 32-bit length field, depending on the desired tradeoff between overhead and maintaining word alignment.