2026: RIST vs SRT Comparison

Both Reliable Internet Stream Transport (RIST) and Secure Reliable Transport (SRT) have been developed to enable live low-latency video contribution over the public internet. Updated for 2026, here are some of the key differentiators between the two. New additions have been highlighted in blue.

Comparing SRT vs 1.5.4 vs RIST TR-06-02:2023, TR-06-03:2023, TR-06-04: part 1- part 9

 

RIST

SRT

Notes

Underline protocol

RTP/UDP

UDT/UDP

 

Unicast stream

Yes

Yes

 

Multicast stream

Yes

No

SRT allows incoming multicast ingest and playout in a new Multicast destination.

Stream IP preservation

Yes

NO

RIST TR-06-01 may be applied directly on a multicast stream.

RIST TR-06-02/03 can pass through complete IP packet that includes a multicast .

Programable Latency

Yes

Yes

RIST simple profile is limited to 64K packet buffer, RIST main and advanced may be extended to 4G packet buffer.

Programable Packet retransmission

Yes

Yes

 

Bandwidth limit

Yes

Yes

 

FEC support

Yes

Yes

 

File transfer

Yes

Yes

RIST TR-06-02/03 can pass any IP packet and files may be sent as IP packets.

Bi directional traffic

Yes

No

SRT is uni-directional, while in RIST TR-06-02/03 the user may send in both direction.

Stream multiplexing

Yes

Yes

 

Packet filtering

Yes

No

RIST TR-06-02/03 can block any IP packet for enhanced security with white labeling.

PSK Encryption

Yes

Yes

TR-06-02/03 support PSK.

DTLS encryption

Yes

NO

RIST TR-06-02/03 support AES-256 and certificate-based authentication of both peers.

ST2110 support

Yes

NO

Supported natively by TR-06-03 and TR-06-02 enhance header.

Extra-large Buffer size

Yes

NO

RIST can support up to 32 bit buffer size for high bit rate content, SRT sequence number is only 31 bit long.

SMPTE2022-7

Yes

NO

RIST support single buffer for any number of paths, SRT support 1 + 1 paths. Each path is SRT protected causing longer latency. Note that some private SRT implementation did include SMPTE2022-7 support.

Load share

Yes

NO

SRT supports full stream transmission while RIST supports partial stream per path

Service/PID suppression

Yes

NO

See TR-06-04 Part 6: Transport Stream Program Selection to remove unwanted bandwidth when network conditions are bad and reintroduce them when conditions are favorable.

Dynamic load share

Yes

NO

See TR-06-04 Part 1:2022 RIST Source Adaptation.

Source adaptation

Yes

NO

See TR-06-04 Part 1:2022 RIST Source Adaptation.

Secure Multicast authentication

Yes

NO

See TR-06-02:2022.

HybridSAT/IP IN Band

Yes

NO

RIST TR-06-04 Part 7 specifies the implementation of a hybridSAT IP using in band data added to the stream for broadcast Satellite recovery using RIST.

OTA HybridSAT

Yes

NO

RIST TR-06-04 Part 9 specifies the implementation of an OTA/IP hybrid implementation to recover and seamlessly slices streams sent over OTA and ATSC3.

Fragmentation

Yes

NO

Supported in TR-06-03.

IPv6

Yes

NO

Supported in TR-06-03.

Any protocol encapsulation

Yes

NO

Supported in TR-06-03.

Flow priority

Yes

NO

Supported in TR-06-03.

Main/backup streams

Yes

Yes

 

Flow identification

Yes

NO

Supported in TR-06-03.

Flow expedite

Yes

NO

Supported in TR-06-03.

Relay server

Yes

Partial

See TR-06-04 Part 3, SRT offers products that can mimic a Relay functionality.

VPN support

YES

NO

See TR-06-04 Part 2.

Decoder synchronization

YES

NO

See TR-06-04 Part 4.

Multicast discovery

YES

NO

See TR-06-04 Part 5.

Maintainer

VSF

Haivision

RIST is maintain by a group of vendor companies.

Opensource version

Yes

Yes

 

FFMPEG

Yes

Yes

 

VLC

Yes

Yes

 

GSstreamer

Yes

Yes

 

 

 

 

 

 

References:

·       https://github.com/Haivision/srt

·       TR-06-1:2020 Reliable Internet Stream Transport (RIST) [Simple Profile] 

 

 

Helen Weedon