C++ low-latency

Open-source C++ projects categorized as low-latency

Top 20 C++ low-latency Projects

  • srs

    SRS is a simple, high efficiency and realtime video server, supports RTMP, WebRTC, HLS, HTTP-FLV, SRT, MPEG-DASH and GB28181.

    Project mention: Adding WebRTC support to OBS using Rust | news.ycombinator.com | 2022-12-15

    I don't know the answer to the WebRTC part, but as long as you have a server with not-outrageously-priced outbound bandwidth, you can install an open source RTMP server like SRS[1], and stream to that RTMP server from OBS. It's really easy, configure the RTMP server & stream key, then "Start Streaming" which is right next to "Start Recording". You can then hand your friends a link, and they can play it in any media player with RTMP/HLS/FLV stream support, or you can add a simple web UI with e.g. hls.js[2] (very easy to write, there might even be prepackaged solutions) so that they truly don't need to download anything.

    [1] https://github.com/ossrs/srs

    [2] https://github.com/video-dev/hls.js/

  • kungfu

    Kungfu Trader

    Project mention: Low Latency C++ programs for High Frequency Trading (HFT) | reddit.com/r/cpp | 2022-12-11
  • InfluxDB

    Build time-series-based applications quickly and at scale.. InfluxDB is the Time Series Platform where developers build real-time applications for analytics, IoT and cloud-native services. Easy to start, it is available in the cloud or on-premises.

  • srt

    Secure, Reliable, Transport

    Project mention: 4 Different ways to Broadcast SRT Streams | dev.to | 2023-01-09

    SRT, or Secure Reliable Transport, is a type of streaming protocol that provides enhanced security and reliability for video streaming. SRT is becoming increasingly popular among broadcasters and streamers including industry stalwarts such as ESPN because of its ability to deliver high-quality content over challenging network conditions and for its ability to make contribution and stream ingestion easy. SRT streams provide improved security, low latency, and flexibility and is supported by a global community of developers all contributing to the open-source project. Because of the power of SRT streams, Dolby.io Real-Time Streaming has decided to launch support with an SRT open beta program.

  • OvenMediaEngine

    OvenMediaEngine (OME) is a Sub-Second Latency Live Streaming Server with Large-Scale and High-Definition. #WebRTC #LLHLS

    Project mention: Looking for a program where I can livestream / share my screen in close to real time (like discord) | reddit.com/r/selfhosted | 2023-01-28

    I had great luck with setting up OvenMediaEngine with a custom OvenLiveKit player HTML. I stream to the server via RTMP and it publishes the stream over WebRTC. In the best case I got around 1 second latency, since there's a bit of overhead while converting audio channels (WebRTC only supports Opus, OBS only supports AAC (I think)). Also you can't use B-Frames, so you need to pay attention to that in OBS.

  • sonobus

    Source code for SonoBus, a real-time network audio streaming collaboration tool.

    Project mention: Hi guys and gals, does anyone in the group play music? I’m a guitarist that likes to play online on the NINJAM and Sonobus platforms. If you have a rudimentary studio setup, not even anything fancy, it sounds like we’re in the same room. Sonobus is even more conversational like voice chat. | reddit.com/r/Clarksville | 2023-01-20
  • CppServer

    Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution

  • cachegrand

    cachegrand - a modern OSS Key-Value store built for today's hardware

    Project mention: C++ caching library with tiering (RAM + disc) | reddit.com/r/cpp | 2023-01-03

    Closest that comes to my mind is CacheGrand. It doesn’t have some of the features yet, but I believe @daniele_dll is working on it!

  • Sonar

    Write Clean C++ Code. Always.. Sonar helps you commit clean C++ code every time. With over 550 unique rules to find C++ bugs, code smells & vulnerabilities, Sonar finds the issues while you focus on the work.

  • quill

    Asynchronous Low Latency C++ Logging Library (by odygrd)

  • fmtlog

    fmtlog is a performant fmtlib-style logging library with latency in nanoseconds.

    Project mention: A new nanosecond clock for x86 Linux/Windows | reddit.com/r/cpp | 2022-06-26

    I see you are also the author of fmtlog. I haven't used this logging library, but my experience with logging real-time concurrent stuff is that often what I need more than "nanosecond accuracy", is the order concurrent things are happening.

  • roq-api

    The Roq C++20 API used for Live Cryptocurrency Algorithmic and High-Frequency Trading as well as for Back-Testing and Historical Simulation

  • nap

    NAP Framework source code

    Project mention: C++ Show and Tell - August 2022 | reddit.com/r/cpp | 2022-08-01
  • leaf

    Lightweight Error Augmentation Framework (by boostorg)

  • MWEngine

    Audio engine and DSP library for Android, written in C++ providing low latency performance within a musical context, while providing a Java/Kotlin API. Supports both OpenSL and AAudio.

    Project mention: I want to make a groovebox app | reddit.com/r/androiddev | 2022-08-26

    Check this: https://github.com/igorski/MWEngine

  • husarnet

    Husarnet is a Peer-to-Peer VPN to connect your laptops, servers and microcontrollers over the Internet with zero configuration.

    Project mention: ZeroTier VS husarnet - a user suggested alternative | libhunt.com/r/ZeroTierOne | 2023-01-23
  • lwlog

    Very fast synchronous C++17 logging library

  • roq-samples

    Demonstrates how Roq's API can support different use-cases. [C++20] [Examples]

    Project mention: roq-samples: NEW Extended Research - star count:95.0 | reddit.com/r/algoprojects | 2022-04-09
  • CppSerialization

    Performance comparison of the most popular C++ serialization protocols such as Cap'n'Proto, FastBinaryEncoding, Flatbuffers, Protobuf, JSON

  • LruClockCache

    A low-latency LRU approximation cache in C++ using CLOCK second-chance algorithm. Multi level cache too. Up to 2.5 billion lookups per second.

    Project mention: Is 180 million lookups per second performance ok for an asynchronous cache written in C++ running on FX8150? (has cache-coherence and runs only 1 consumer thread as back-end) | reddit.com/r/programming | 2022-02-14
  • lowl_audio

    Low Latency Audio - aims to provide audio playback

  • LoLa

    Low Latency Radio System

  • SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-01-28.

C++ low-latency related posts


What are some of the best open-source low-latency projects in C++? This list will help you:

Project Stars
1 srs 20,507
2 kungfu 2,774
3 srt 2,460
4 OvenMediaEngine 1,785
5 sonobus 1,066
6 CppServer 970
7 cachegrand 821
8 quill 699
9 fmtlog 455
10 roq-api 366
11 nap 336
12 leaf 254
13 MWEngine 243
14 husarnet 186
15 lwlog 152
16 roq-samples 133
17 CppSerialization 112
18 LruClockCache 38
19 lowl_audio 5
20 LoLa 4
SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives