48
□
The RTP protocol itself.
□
The Real-time Transport Control Protocol - RTCP.
The RTP protocol is a simple protocol which defines a standardized packet format for delivering
audio and video over IP networks.
The RTCP protocol provides statistics and control information over the RTP stream.
RTP is used extensively in communication and entertainment systems that involve streaming
media.
RTP comes in various flavors, depending on the following choices:
□
The
transport modality
of the RTP stream over the network.
□
The
type of media
transported by the RTP stream.
Media Transport Control Protocol
Picolo.net products use the Real-time Streaming Protocol - RTSP - as the control protocol for all
the flavors of RTP streams.
RSTP is described by RFC 2326. It allows controlling another protocol (usually RTP),
implementing commands such as Play (start a stream), Pause (pause a stream) and Describe
(describe the streams controlled by the current RTSP session).
RTSP uses TCP as its transport protocol.
Media Transport Security Protocol
Picolo.net HD1 uses the Transport Layer Security - TLS - to encrypt, when required, the media
stream.
The TLS Protocol encrypts an HTTP stream using various cryptographic algorithms. As such, only
the "RTP interleaved in RTSP over HTTP" transport modality is applicable for media stream
encryption purposes.
RTP Transport Modalities
The following modalities are available to transport the RTP stream over an IP network:
RTP over UDP Unicast
In this modality, the RTP stream is sent using the User Datagram Protocol - UDP - described in
RFC 768.
The UDP protocol is a "fire and forget" protocol. The sender sends the data through the network
and doesn't care whether that data arrives to the client or not. The data is never resent, and thus
can be lost if a problem happens during the transport.
In the Unicast mode, the sender sends the data to a single receiver.
Picolo.net
Getting Started
