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What is SRT Video Streaming?

Secure Reliable Transport (SRT) is a low-latency media transport protocol for unpredictable IP networks. It supports encryption and recovers lost packets within a configured latency window while carrying contribution-quality streams between endpoints.

How SRT Video Streaming works

Secure Reliable Transport sends a continuous media feed over UDP while the receiver reports missing packets so they can be selectively retransmitted. Its latency window gives missing data time to be resent, and in the default live configuration packets that cannot be recovered within that window are dropped so playback stays on schedule: SRT bounds loss rather than guaranteeing delivery. Encryption can protect the transport between configured peers, while the carried media is commonly produced and consumed by broadcast encoders or gateways. SRT is most often a contribution link before packaging into viewer-facing adaptive streaming formats.

Key facts

  1. SRT loss recovery is driven by receiver loss reports with periodic acknowledgments rather than TCP’s byte-stream delivery, allowing retransmission timing to be tuned for live media over variable networks.
  2. Caller, listener, and rendezvous connection modes address different endpoint and firewall arrangements; both sides still need compatible latency, encryption, and stream-identification settings.
  3. SRT secures and repairs the transport but does not define the video codec or viewer manifest; interoperability also depends on the payload container, elementary streams, and decoder support.

When SRT Video Streaming matters

Choose SRT for feeds between encoders, remote sites, and streaming infrastructure when network loss is expected. Increasing recovery latency tolerates longer disruptions but adds delay, so both endpoints need compatible settings.

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