When people compare HLS and RTMP, they often treat them like a pure protocol showdown. In practice, for CDNsun CDN HTTP Live, the more useful question is simpler: how should your live stream enter the platform?
Your source first enters a Publishing Point, which is the ingest layer. That Publishing Point then feeds a CDN HTTP Live service, the delivery layer that distributes the stream through CDNsun’s global network.
Source -> Publishing Point -> CDN HTTP Live service -> viewer playback
That is why HLS vs RTMP here is mostly a workflow decision. If your source already exists as HLS or DASH output, HLS-based ingest is often the natural fit. If your encoder or upstream server already speaks RTMP, RTMP-based ingest is usually the more direct path.
First, keep ingest and delivery separate
Before choosing an ingest method, keep the two jobs clearly separated:
- Publishing Point = ingest layer, it defines how CDNsun receives the source stream.
- CDN HTTP Live service = delivery layer, it distributes that stream to viewers through CDNsun’s CDN.
So RTMP in this workflow is an ingest choice, not the viewer playback protocol of the CDN HTTP Live service. HLS can appear on both sides of the workflow, as an ingest format and as a delivery format, depending on how your setup is built.
There is one more distinction that makes the decision easier:
- Pull means CDNsun connects to your infrastructure and fetches the stream.
- Push means your encoder, origin, or storage workflow sends the stream to CDNsun.
Keep those two ideas in mind, ingest vs delivery and pull vs push, and the product choice gets much easier.
HLS vs RTMP in one practical sentence
If your pipeline already produces HLS or DASH assets, stay with an HLS-based ingest method. If your encoder already outputs RTMP, an RTMP-based ingest method is usually the most direct path.
That is why this is usually a workflow decision, not a protocol debate.
The four ingest methods in CDN HTTP Live
CDNsun CDN HTTP Live supports four Publishing Point input methods: HLS Pull, HLS Push, RTMP Push, and RTMP Pull. Each one is useful. Each one solves a slightly different operational problem.
| Ingest method | Typical source | Who starts the connection | Best fit |
|---|---|---|---|
| HLS Pull | Existing HLS or DASH origin | CDNsun | Teams that already publish HLS or DASH on their own infrastructure |
| HLS Push | HLS or DASH segments uploaded to CDN Storage | Your workflow | Automated or storage-backed publishing pipelines |
| RTMP Push | Live encoder output | Your encoder or publishing workflow | OBS, Wirecast, and other direct encoder workflows |
| RTMP Pull | Existing RTMP origin or media server | CDNsun | Teams that want to keep an upstream RTMP server in place |
HLS Pull
HLS Pull is the natural choice when you already publish an HLS stream on your own domain or server and want CDNsun to fetch it from there. DASH fits the same model.
It is a strong option for teams that already have an origin in place and simply want to add CDN delivery without reworking the upstream stack.
Who it is for
- Teams with an existing HLS origin or packager
- Customers who want CDN scale without changing the way the source is produced
- Workflows where the HLS stream already exists before CDNsun enters the picture
Advantages
- Minimal disruption to an established workflow
- Clear separation between your origin generation and CDN delivery
- Natural fit when you already trust your own HLS packaging pipeline
Tradeoffs
- Your origin still needs to stay healthy and reachable because CDNsun is pulling from it
- You are responsible for the quality of the upstream playlists and segments
- If you need a multi-bitrate ladder, you generally need to prepare it on your side unless your workflow uses RTMP Push
Operationally, HLS Pull is often the least risky option for mature streaming teams. If the stream already exists in HLS form, pulling it into CDNsun is usually the simplest way to extend reach.
HLS Push
HLS Push works well when your workflow already generates HLS output and you want to upload that stream to CDN Storage, letting CDNsun deliver it from there. DASH is also supported for HLS-based Publishing Points.
This is usually a better fit for controlled or automated workflows than for a typical desktop encoder setup.
Who it is for
- Developer-led streaming pipelines
- Automated publishing workflows
- Teams that want a storage-backed handoff instead of maintaining their own live origin server
Advantages
- Clean handoff into CDNsun infrastructure through CDN Storage
- Useful when your tooling already creates playlists and segments as artifacts
- Good fit for repeatable, scripted, or scheduled publishing patterns
Tradeoffs
- Your pipeline must already generate HLS or DASH output correctly
- It is typically less convenient than RTMP Push for standard live encoder workflows
- As with other non-RTMP-Push methods, bitrate variants usually need to exist before delivery if you want adaptive output beyond the source bitrate
A practical example is FFmpeg in an automated environment. If a team already uses FFmpeg or a custom packager to generate segmented output, HLS Push can fit neatly into that operating model.
RTMP Push
RTMP Push is often the most familiar option because many live encoders already support it directly. Your encoder publishes to a CDNsun Publishing Server, and CDNsun transcodes that RTMP input into HLS for delivery.
For many teams, this is the shortest path from encoder to CDN.
Who it is for
- OBS users running self-serve live events
- Wirecast teams producing more polished or operator-driven broadcasts
- FFmpeg users pushing live output from scripts, automation, or test workflows
- Anyone whose encoder already speaks RTMP natively
Advantages
- Usually the easiest way to connect a live encoder to CDNsun
- No need to build an HLS packaging workflow before ingest
- Supports transcoding of a single RTMP input into a multi-bitrate HLS stream
Tradeoffs
- Your encoder has to meet the expected stream requirements
- RTMP Push is ideal when the source is an encoder output, but less natural if your source already exists as HLS segments
- You are sending a real-time contribution feed, so encoder-side stability still matters
This is where recognizable tools fit naturally. OBS is common in self-serve live events and smaller productions. Wirecast often appears in more production-oriented environments with an operator driving the show. FFmpeg fits especially well when engineers want repeatable command-line publishing for scheduled, test, or automated streams.
If you want the most direct encoder-to-CDNsun path, RTMP Push is usually the first option to evaluate.
RTMP Pull
RTMP Pull makes sense when the source already exists as an RTMP stream on your side and you want CDNsun to fetch it from that RTMP URL.
Instead of pointing the encoder directly at CDNsun, you keep your upstream RTMP origin in place and let CDNsun pull from it.
Who it is for
- Teams that already run their own RTMP-capable streaming server
- Workflows where the encoder already feeds internal infrastructure first
- Customers who want to preserve their current upstream topology
Advantages
- Lets you keep an existing RTMP origin workflow
- Useful when changing encoder destinations would be inconvenient
- Gives you CDN delivery without removing your current upstream server role
Tradeoffs
- You still operate and depend on the upstream RTMP source
- It is less direct than RTMP Push when the encoder could publish to CDNsun itself
- Unlike RTMP Push, it is not the path designed for multi-bitrate HLS transcoding from one incoming live encoder stream
RTMP Pull is usually the practical answer when RTMP already exists upstream and you want CDNsun to integrate around that reality instead of forcing a workflow change.
Where OBS, Wirecast, and FFmpeg fit
A good shortcut is to start from the tool you already trust.
OBS usually points toward RTMP Push. It is a natural match for straightforward live broadcasting setups and self-serve event workflows.
Wirecast also commonly fits RTMP Push, especially when a team wants a polished live production workflow with a direct path into CDNsun.
FFmpeg is more flexible. It can behave like a live encoder and push RTMP, or sit inside a more automated HLS-based pipeline, which makes it a strong fit for engineering teams, scheduled publishing, and test environments.
The pattern is simple: choose the ingest method that matches what your toolchain already produces well.
How to choose without overthinking it
If you want the short version, choose the ingest method that is closest to the way your stream already exists today.
- If your source already exists as HLS or DASH output, use an HLS-based Publishing Point.
- If your source already exists as RTMP, use an RTMP-based Publishing Point.
- If you want CDNsun to fetch the stream from your side, choose Pull.
- If you want your encoder or workflow to send the stream to CDNsun, choose Push.
- If you are connecting a live encoder directly, RTMP Push is often the cleanest fit.
- If you want CDNsun to create a multi-bitrate HLS stream from one incoming stream, RTMP Push is the first option to evaluate.
- If you want the least workflow change, keep the toolchain you already trust and choose the ingest method that matches it.
Why this matters commercially, not just technically
The most cost-effective workflow is usually the one that fits your current stack instead of forcing unnecessary rework.
If you already have an HLS origin, use it. If your encoder already publishes RTMP, use that. The goal is not to chase a fashionable protocol. The goal is to launch a stable streaming workflow your team can operate confidently.
That is exactly where CDNsun’s CDN HTTP Live service becomes attractive:
- It is available in all CDN locations, so you are not limited to a smaller streaming-only footprint.
- Ingest traffic for CDN HTTP Live is free, and CDNsun does not add separate charges for streaming or transcoding.
- Pay-as-you-go pricing is especially attractive for occasional streamers, because they pay only for what they actually use.
- If you use HLS Push, CDN Storage can support that workflow without forcing you to stand up your own live origin infrastructure.
For teams that stream events periodically, run seasonal broadcasts, or want a clean path from testing into production, that combination can be very practical.
The practical recommendation
Do not choose between HLS and RTMP as if one were universally superior. Choose the ingest method that best matches how your live source is already produced today.
- If you already have HLS or DASH on your side, choose HLS Pull or HLS Push.
- If you already publish from an encoder over RTMP, choose RTMP Push.
- If you already expose an RTMP stream from your own server, choose RTMP Pull.
That approach keeps the architecture easier to understand, reduces migration effort, and makes it easier to scale delivery through CDNsun once the stream enters the platform.
If you want to validate the workflow in practice, the easiest next step is to create a Publishing Point, attach it to a CDN HTTP Live service, and test it with a real source. CDNsun offers a 15-day free trial, which is a practical way to compare ingest options with your actual encoder, origin, and audience requirements.