If you've ever set up a live stream with OBS or any encoder, you've seen the acronyms: RTMP and SRT. Both are streaming protocols — but they work very differently, and choosing the wrong one can tank your stream quality.
Let's break them down, compare them, and figure out which one you should actually be using.
What Is RTMP?
RTMP (Real-Time Messaging Protocol) was developed by Macromedia (later acquired by Adobe) in the early 2000s. It became the de facto standard for live streaming because of its wide compatibility — basically every streaming platform (YouTube, Twitch, Facebook) accepts an RTMP ingest.
Pros of RTMP:
- Universal compatibility — almost every platform supports it
- Low latency (typically 2–5 seconds)
- Simple to configure: just a stream URL + stream key
Cons of RTMP:
- Not optimized for poor network conditions
- Packet loss = dropped frames, stuttering, or stream disconnects
- No native encryption
What Is SRT?
SRT (Secure Reliable Transport) is an open-source protocol developed by Haivision and released in 2017. It was designed specifically to solve the problems RTMP couldn't — particularly around network instability and security.
Pros of SRT:
- Built-in error correction — handles packet loss without dropping the stream
- Encrypted by default (AES-128/256)
- Performs well on unstable, high-latency networks
- Better for long-distance or international streams
Cons of SRT:
- Less universally supported than RTMP (though adoption is growing fast)
- Slightly more complex to configure
Head-to-Head Comparison
| RTMP | SRT | |
|---|---|---|
| Latency | ~2–5 sec | ~0.1–2 sec |
| Packet loss handling | Poor | Excellent |
| Encryption | No (by default) | Yes (AES) |
| Platform support | Universal | Growing |
| Best for | Stable connections | Unstable/remote streams |
So Which Should You Use?
Use RTMP if:
- You're streaming from a stable home network
- You're targeting platforms like YouTube or Twitch that natively accept RTMP
- You want the simplest setup with maximum compatibility
Use SRT if:
- You're streaming from a mobile hotspot or unstable network
- You need low-latency, broadcast-grade quality
- Security and encryption matter to your workflow
How Multistreaming Tools Handle This
Most modern multistreaming platforms now support both protocols. For example, Streemzy supports both RTMP and SRT ingest — meaning you can:
- Stream from OBS via SRT to Streemzy's ingest server (better quality on unstable networks)
- Streemzy re-streams to 25+ platforms simultaneously
This decouples your encoder from the platform-specific delivery layer — a great pattern for developers building streaming pipelines. And Streemzy has a free tier, so no infrastructure cost to get started.
A Quick OBS Setup Example
RTMP in OBS:
Settings → Stream
Service: Custom
Server: rtmp://your-ingest-server/live
Stream Key: your_stream_key
SRT in OBS:
Settings → Stream
Service: Custom
Server: srt://your-ingest-server:port?streamid=your_id&latency=2000
The latency parameter in SRT is in milliseconds — 2000 (2 seconds) is a safe default for most setups.
TL;DR
- RTMP = old but universal. Fine for stable home networks and major platforms.
- SRT = modern, encrypted, resilient. Use it for unstable or remote streams.
- For multistreaming, use a platform like Streemzy that supports both — push once, reach everywhere.
Questions about your specific streaming setup? Drop them in the comments!
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