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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →HLS, SRT, and WebRTC are not interchangeable replacements for RTMP: they serve different parts of a live-streaming workflow. HLS is mainly for delivering video to viewers, SRT is a contribution option for sending video over unreliable networks, and WebRTC is designed for real-time interactive media. Choose based on where the protocol sits in your pipeline, the delay you can tolerate, and what your encoder, platform, and player support.
Start with the job the protocol needs to do
A live stream usually has two distinct paths: contribution, where an encoder sends a feed to a platform or media server, and delivery, where that service sends video to viewers. Interactive products add another requirement: viewers and participants may need to exchange media with very little delay.
- Contribution or ingest: RTMP remains broadly compatible with encoders. SRT is worth considering when the contribution path crosses an unreliable public internet connection and both ends support it.
- Viewer delivery: HLS sends audio and video over HTTP and is suited to distribution through ordinary web servers and CDNs. It supports adaptive bit-rate streams that can switch as a viewer’s available bandwidth changes.
- Interactive communication: WebRTC is intended for real-time media and data exchange between browsers or devices, making it a better fit for conversation and synchronized audience response than a conventional broadcast-delivery workflow.
A production can use different protocols at different stages. For example, Mux describes workflows that use SRT for contribution and HLS for playback after the service transcodes the feed. That is an example of one provider’s architecture, not a guarantee about every platform.
How the options compare
| Protocol | Typical role | Best fit | Important limitation |
|---|---|---|---|
| RTMP | Contribution/ingest | Existing encoders and platforms that prioritize broad compatibility | Mux gives a typical pipeline range of 3–10 seconds, but that is vendor guidance, not a universal protocol limit. |
| HLS | Viewer delivery | Serving live or prerecorded video to broad audiences over HTTP/CDN infrastructure, with adaptive bit-rate playback | Do not treat it as a direct ingest replacement for RTMP. Delivery delay depends on authoring, server, player, and network choices. |
| Low-Latency HLS | Lower-delay viewer delivery | Broadcast-style viewing where reducing delay matters but HTTP delivery remains desirable | Apple’s 2026-accessed authoring specification recommends a one-second part target; this is not a promise of one-second end-to-end latency. |
| SRT | Contribution/ingest | Remote production across lossy or unpredictable public internet connections, when the encoder and receiving service both support it | Mux describes configurable latency of roughly 500 milliseconds to several seconds depending on buffer settings and network conditions; this is not a guaranteed result. |
| WebRTC | Real-time interactive media | Calls, participation, bidding, or other cases where participants need to respond in sync | Fan-out and deployment infrastructure can be more involved. Mux’s sub-500-millisecond comparison figure is vendor guidance, not a protocol guarantee. |
Latency is a property of the complete system, not just the protocol name. Encoder settings, server handling, transcoding, buffers, player behavior, and network conditions all contribute to glass-to-glass delay. Mux’s published comparisons are useful operational guidance, but its figures should not be read as independent benchmarks or universal outcomes.
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When HLS or Low-Latency HLS makes sense
HLS for scalable viewer delivery
Apple describes HLS as delivering audio and video over HTTP from ordinary web servers. Its adaptive bit-rate approach can switch among alternate streams as bandwidth changes, while HTTP and CDN infrastructure can serve large passive audiences. It supports both live and prerecorded content. This makes HLS a delivery choice, not simply another name for an encoder-to-platform ingest protocol.
Low-Latency HLS requires deliberate authoring
Apple’s HLS authoring guidance recommends a one-second part target duration. It also says the part target must be at least the maximum expected P95 client-to-server round-trip time and recommends making it at least three times that P95 round-trip time. The PART-HOLD-BACK must be at least three times the part target duration.
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These relationships explain why a one-second part target does not mean viewers will see the event one second after it happens. The playlist, server, player, network, and chosen hold-back all matter. A service must support the relevant Low-Latency HLS behavior end to end, and the client and network must be able to sustain it.
When to choose SRT
Mux positions SRT as a strong candidate for remote production and contribution over a lossy, unpredictable public internet path. Its comparison gives a configurable latency range of roughly 500 milliseconds to several seconds, depending on buffer settings and network conditions. That range is guidance from Mux, not a fixed property every SRT workflow will achieve.
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Before changing an existing contribution workflow, confirm SRT support at both ends: the encoder must be able to send it and the platform or media server must be able to receive it. If the current encoder or destination does not support SRT, switching only one component will not complete the workflow.
When to choose WebRTC
WebRTC is the relevant option when the product needs real-time exchange rather than just low-delay broadcast playback. The W3C WebRTC Recommendation defines browser APIs for sending and receiving real-time media and data with another browser or device. IETF RFC 8834 specifies RTP use in WebRTC and describes support for direct interactive communication; RFC 8835 describes the transport suite, including secure RTP and DTLS-SRTP key exchange.
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Real deployments may need network traversal and relays, and a service that fans one source out to many viewers may need additional media infrastructure. Mux places WebRTC in sub-second interactive use and cites a sub-500-millisecond comparison figure, but those are vendor descriptions rather than protocol-level performance guarantees. Confirm the expected behavior with the actual service and network conditions.
A practical selection path
- If you are publishing from an existing encoder to a platform: check the platform’s ingest options and your encoder’s supported outputs first. RTMP is often practical where broad compatibility is the priority. Consider SRT if the contribution route is unreliable and both ends support it.
- If you are serving a live channel to many viewers: consider HLS for HTTP/CDN delivery and adaptive bit-rate playback. Choose Low-Latency HLS only when the server, playlist authoring, player, and network can meet the required configuration constraints.
- If participants must interact in real time: evaluate WebRTC and the product’s media-server or relay requirements. A conventional HLS workflow should not be expected to behave like a live call.
- If your system has separate ingest and playback needs: choose each stage independently. An ingest protocol does not inherently dictate the viewer protocol; the receiving service’s architecture determines how it processes and delivers the feed.
Compatibility and planning checklist
- Write down whether you need contribution, delivery, or interactive exchange before comparing protocol names.
- Check the complete chain: encoder output, platform or media-server ingest, transcoding, and viewer player. Support at one point does not prove support end to end.
- Define an acceptable glass-to-glass delay for your use case rather than selecting a protocol based on a headline latency number.
- For unstable contribution links, evaluate SRT support at both ends; for broad delivery, evaluate HLS and the destination’s CDN/player behavior.
- For WebRTC, account for the participant network paths and any traversal, relay, or fan-out infrastructure the deployment requires.
- Test with the actual encoder, receiving service, player, and network conditions. Protocol labels alone cannot establish the delay or reliability viewers will experience.
Common decision mistakes
Calling HLS an ingest substitute
HLS’s principal strength is viewer delivery over HTTP infrastructure. If the immediate problem is getting an encoder feed into a platform, verify the platform’s ingest choices rather than assuming HLS occupies the same pipeline role as RTMP.
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Expecting a protocol to guarantee a latency figure
Latency depends on configuration and the whole delivery path. Treat Mux’s RTMP, SRT, and WebRTC figures as attributed comparison guidance, not fixed limits or promises. Low-Latency HLS’s one-second part target is an authoring recommendation, not the final viewer delay.
Changing only one part of the workflow
A protocol change succeeds only if the relevant sender, receiver, and playback chain support the selected path. Confirm compatibility before replacing an encoder output or platform ingest setting.
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