Reliable Internet Stream Transport "RIST" Activity Group

The RIST AG was formed to address the lack of compatibility between devices that provide reliable low-latency transport of high-quality video over public IP networks. This effort has led to many companies and organizations producing products that support RIST. Along with interoperability demos at industry events such as IBC and NAB, RIST is being actively supported by the 150+ members of the RIST Forum (

RIST is available as a truly open specification, so any organization can freely download the documents and develop compliant solutions that can be incorporated into products under the included license terms. RIST is also available as open source, with code available in several public repositories, including the LibRIST repository: RIST has been incorporated into a number of open-source projects, including VLC, FFMPEG, gstreamer, OBS Studio and WireShark.

The following open specifications have been produced:

TR-06-1 (RIST Simple Profile), first released in 2018, defines the basic ARQ (Automatic Repeat Query) technology used to recover lost packets. It has been updated in 2020 to include an optional "RTT Echo" message that streamlines the process of configuring packet buffers.

TR-06-2 (RIST Main Profile), released in 2022, is a revision of the Main Profile Specification to include support for the VSF EtherType. The earlier revisions of TR-06-2 used the experimental EtherTypes for the Reduced Overhead and Keep-Alive packets. VSF has now registered its own EtherType with the IEEE, and thus TR-06-2 has been revised to use this value.

TR-06-3 (RIST Advanced Profile) released in 2021, provides a protected tunneling mode that can carry any legacy protocol, including RTP-based media signals such as SMPTE ST 2110, ST 2022 and MPEG TS over UDP. In addition, bidirectional protocols based on TCP can be transported securely and reliably in the same packet tunnel while consuming only a single UDP port to simplify firewall configuration.

Work continues within the RIST AG towards developing further RIST specifications that include additional features. All VSF members are welcome to join the RIST AG by contacting the co-chairs.

RIST Activity Group Authorization Form (doc, 63k)

  • Link to Visit the VSF Channel on YouTube - over 180 videos, with more each week!
  • Link to IP Showcase Theatre presentations, curated by VSF
  • Link to JT-NM
  • Link to GDPR Policy