Introduction
If you've spent any time setting up a live streaming workflow, you've encountered the acronym soup of streaming protocols — RTMP, SRT, HLS, DASH, RIST, WebRTC. Each protocol was designed for a different purpose in the streaming pipeline, and choosing the wrong one for your use case results in unnecessary latency, poor reliability, or compatibility issues.
MSLIVE Technologies supports all major streaming protocols across our infrastructure. This guide cuts through the confusion and explains exactly when and why to use RTMP, SRT, and HLS — the three protocols that matter most for the majority of live streaming workflows.
The Three Stages of a Live Stream
Understanding streaming protocols starts with understanding the three distinct stages in a live stream's journey:
- Contribution/Ingest: Getting video from your camera or production setup to the streaming server
- Processing: The streaming server transcodes, packages, and prepares content for delivery
- Distribution/Delivery: The CDN delivers packaged video to end viewers
RTMP: The Universal Ingest Standard
What RTMP Is
Real-Time Messaging Protocol (RTMP) was developed by Macromedia in the early 2000s for Flash-based streaming. Despite being decades old, RTMP remains the dominant ingest protocol because virtually every encoder — OBS Studio, vMix, Wirecast, hardware encoders, and streaming software — supports RTMP output.
When to Use RTMP
Use RTMP when sending video from your encoder to the MSLIVE streaming server. It works reliably on stable, high-bandwidth connections like studio fiber or office ethernet. The typical latency added by RTMP ingest is 2–5 seconds — acceptable for most production workflows.
RTMP Limitations
RTMP struggles on unreliable network connections — packet loss causes visible stuttering or stream drops. It lacks built-in encryption (RTMPS adds TLS but is less universally supported). And Adobe officially abandoned RTMP in 2020, meaning long-term support from encoder vendors is uncertain.
SRT: The Professional Contribution Protocol
What SRT Is
Secure Reliable Transport (SRT) is an open-source protocol developed by Haivision that solves RTMP's reliability problems. SRT uses UDP transport with a sophisticated packet loss recovery mechanism that retransmits lost packets without causing stream interruption — invisible error correction that keeps your stream smooth even over congested or unreliable networks.
When to Use SRT
SRT excels for contribution feeds over public internet — remote reporters sending from mobile hotspots, field production over 4G, satellite uplink replacement, and multi-location event production. MSLIVE's SRT streaming server accepts SRT ingest from all major professional encoders including Haivision, Teradek, and LiveU hardware.
SRT Advantages
- Built-in AES-128/256 encryption — no separate security layer needed
- Reliable delivery over connections with up to 25% packet loss
- Sub-second latency possible with optimized configuration
- Open-source with growing encoder ecosystem
- Ideal for bonded cellular and unreliable internet contribution
HLS: The Universal Delivery Protocol
What HLS Is
HTTP Live Streaming (HLS) was developed by Apple and is now the dominant protocol for delivering video to viewers. HLS works by slicing video into small segments and delivering them over standard HTTP — the same protocol used for web pages. This means HLS works through corporate firewalls, on every device, and with every CDN.
When to Use HLS
HLS is almost always the right choice for viewer-facing delivery. MSLIVE's platform converts your RTMP or SRT ingest into HLS streams automatically, generating multiple bitrate variants for adaptive delivery to all viewer devices — from mobile phones to 4K smart TVs.
Low-Latency HLS (LL-HLS)
Standard HLS introduces 15–30 seconds of latency due to segment buffering. Low-Latency HLS reduces this to 2–4 seconds using smaller segments and HTTP/2 push — bringing live streaming latency close to broadcast television. MSLIVE supports LL-HLS for interactive events and sports where latency matters.
Recommended Protocol Stack for Different Use Cases
- Studio broadcast to large audience: RTMP ingest → MSLIVE server → HLS delivery
- Remote field production: SRT ingest → MSLIVE server → HLS delivery
- Interactive sports or auctions: SRT ingest → MSLIVE server → LL-HLS delivery
- Browser-based video call style: WebRTC → MSLIVE server → HLS or WebRTC delivery
- 24/7 TV channel: RTMP or SRT ingest → MSLIVE server → HLS + DASH delivery
Conclusion
RTMP, SRT, and HLS serve different, complementary roles in a professional streaming workflow. MSLIVE Technologies supports all three natively, giving you the flexibility to use the right protocol at each stage without changing your delivery infrastructure.
Contact MSLIVE Technologies at www.mslivestream.com to configure the optimal protocol stack for your streaming workflow.
