RTMP vs SRT vs UDP — Which Protocol is Right for You?

A streaming protocol is the method used to send video data from one point to another. Choosing the right protocol affects your stream's reliability, latency, quality, and compatibility with different platforms. The three most common protocols for broadcast streaming are RTMP, SRT, and UDP.

Best for: Streaming to YouTube, Facebook, Twitch, and most online platforms

RTMP was originally developed by Macromedia (later Adobe) for Flash video. Despite Flash being discontinued, RTMP remains the dominant protocol for sending streams to online video platforms.

Pros:

• Universally supported by all major streaming platforms
• Simple setup — just enter your stream URL and key
• Reliable on stable internet connections

Cons:

• Not designed for unreliable networks (packet loss causes stream drops)
• Higher latency (10–30 seconds typical)
• No built-in error correction

Use RTMP when: You're streaming to YouTube, Facebook, Twitch, or any standard online platform.

Best for: Professional contribution feeds, point-to-point streaming over unreliable networks

SRT was developed by Haivision and is now an open-source standard. It was designed specifically to overcome the limitations of RTMP — particularly for streams over unpredictable internet connections.

Pros:

• Built-in error correction — automatically recovers lost packets
• Low latency (500ms–2 seconds achievable)
• Secure — built-in AES encryption
• Works well over congested or lossy networks

Cons:

• Not supported by most consumer platforms (YouTube, Facebook don't accept SRT directly)
• Requires an SRT-compatible receiver at the other end

Use SRT when: You're sending a contribution feed to a broadcast facility, streaming between locations over the internet, or need low-latency and reliability on an unpredictable connection.

Best for: Local network streaming, IPTV distribution, satellite uplinks

UDP is a basic network protocol that sends data packets without confirming delivery. It's fast and low-overhead, but has no error correction — lost packets are simply lost.

Pros:

• Very low latency
• Low processing overhead
• Standard for IPTV and DVB systems
• Supports multicast (one stream, many receivers)

Cons:

• No error correction — packet loss causes visible artefacts
• Not suitable for streaming over the internet (use on reliable local networks only)

Use UDP when: Distributing over a local network, feeding an IPTV head-end, or connecting to DVB broadcast equipment.

| | RTMP | SRT | UDP | |---|---|---|---| | Latency | 10–30s | 0.5–2s | <100ms | | Error correction | No | Yes | No | | Internet-friendly | Yes | Yes | No | | Platform support | Universal | Limited | IPTV/DVB | | Encryption | No | Yes | No | | InstaPlayout support | Yes | Yes | Yes |

• Streaming to YouTube/Facebook: RTMP
• Sending to a remote studio or encoder: SRT
• Distributing to IPTV subscribers: UDP
• Multi-platform broadcast: RTMP + UDP (or SRT) simultaneously with InstaPlayout's multi-output feature

There's no single "best" protocol — it depends on your use case. The good news is InstaPlayout supports all three, so you can mix and match outputs to reach every audience you need.