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What is Reliable Internet Stream Transport (RIST)?

Reliable Internet Stream Transport (RIST) is an interoperable protocol family for carrying professional video over unreliable IP networks. It supports mechanisms such as packet-loss recovery and encryption.

How Reliable Internet Stream Transport (RIST) works

RIST sends real-time contribution media across ordinary IP paths while adding recovery behavior suited to professional operations. Receivers identify missing sequence ranges and request selected packets again, trading added buffering for better continuity during loss. Standardized profiles build from a basic transport layer toward features such as tunneling, authentication, encryption, and link bonding. It sits between an encoder or gateway and a remote decoder, receiver, or distribution facility.

Key facts

  1. RIST retransmission is selective rather than a full reliable byte stream: the receiver requests missing packets, and packets arriving after the recovery window may be discarded.
  2. Simple Profile is based on RTP and RTCP-compatible mechanisms, while Main Profile adds capabilities including secure tunneling and stream multiplexing.
  3. Interoperability depends on both endpoints supporting the same profile and settings; a nominal RIST label alone does not guarantee matching security or bonding features.

When Reliable Internet Stream Transport (RIST) matters

Broadcasters can choose RIST for contribution feeds over the public internet when a private circuit is impractical. Endpoints must implement compatible RIST profiles and allow enough recovery time for the expected packet loss.

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