Use Dacast’s Simulcast feature to forward an existing encoder-based live channel to a YouTube Live event. The connection is configured in Dacast, but the live source still comes from your encoder, and adding YouTube may change the Dacast ingest URL that your encoder uses.
The reliable order is: prepare the YouTube event and key, add YouTube as a Simulcast destination in Dacast, recheck the Dacast URL in the encoder, then start the encoder and inspect both previews. Simulcast does not create the live source or replace the encoder.
What this connection does
The path has three separate parts. Your encoder sends audio and video to a Dacast live channel. Dacast receives that feed and forwards it to the YouTube destination you configure. YouTube then processes the incoming feed for the live event viewers watch.
That distinction matters when you are troubleshooting. A YouTube event can exist without receiving a feed, and a Dacast destination can be saved without the encoder being online. Adding Simulcast connects the forwarding route; it does not start the encoder, create a Dacast channel, or automatically make a YouTube event for you.
YouTube’s documentation separates the broadcast from the stream carrying the media. The broadcast is the viewer-facing event, while the live stream provides the ingestion details used to send audio and video. You can read the underlying model in Google’s explanation of YouTube broadcasts and streams.
For a 24/7 devotional channel, news loop, study station or ambience stream, this means you should treat the setup as a chain rather than one switch. The encoder must reach Dacast, Dacast must have a saved YouTube destination, and YouTube must accept the feed for the selected event.
Check the prerequisites first
Begin with an existing Dacast live channel that receives an encoder feed. Dacast’s Simulcast documentation describes the feature as forwarding an eligible encoder live channel to another destination. It is not the right starting point for an HLS ingest channel or a VOD Rebroadcast channel, which the current Dacast API documentation excludes from this workflow.
You also need access to the Dacast account and enough Simulcast credits to add the destination. Check the account before scheduling the event. If the account has no remaining credits, Dacast documents that an attempt to add a destination can return a 403 response. That is easier to resolve before the encoder is running than during a live launch.
On the YouTube side, create or schedule the live event in YouTube Studio and open the stream information for that event. Copy the stream key associated with the event. Do not use a key from an older event simply because its label looks familiar. YouTube supplies the ingestion information for the particular stream, so keep the event and its key together while configuring Dacast.
You should also know the current Dacast ingest settings already configured in your encoder. Take a screenshot or note the URL before changing Simulcast. This gives you something to compare when you recheck the encoder later, because Dacast warns that adding a destination can change the ingest URL.
Finally, make sure the encoder is ready to send the same programme you intend to keep live. Test the audio, video, aspect ratio and source before adding another destination. If you are running the encoder from a local computer, a separate checklist for when OBS stops a 24/7 YouTube stream can help you distinguish a source or computer problem from a Simulcast problem.
Find Simulcast in the Dacast channel
Sign in to Dacast and open the live channel that receives the encoder feed. Select the channel itself rather than looking for a general account-level destination setting. In the channel controls, open the Engagement tab and find Simulcast.
The exact wording or placement can change as dashboards are updated, so use the current Dacast interface if the labels differ. The important point is that Simulcast belongs to the selected eligible live channel. You are attaching YouTube to this channel’s incoming feed, not creating a separate source.
Choose Connect in the Simulcast area to begin adding a destination. If the option is absent, stop before changing unrelated settings. First confirm that you selected an encoder live channel and that the account has Simulcast access and available credits. HLS ingest and VOD Rebroadcast are not interchangeable with the encoder channel required here.
At this stage, do not start the encoder merely to make the button appear. The destination can be configured while the source is offline. Starting early can make it harder to tell whether a later problem comes from the saved destination, the encoder, or YouTube’s event state.
Add YouTube as the destination
In the destination setup, choose YouTube. Dacast’s support instructions use the YouTube stream key from YouTube Studio as part of this configuration. Keep YouTube Studio open in another browser tab, but avoid copying a sample key, a channel identifier or a URL from a different event.
Paste the key into the requested field. Treat it as a credential: do not publish it in a tutorial screenshot, send it in a public chat or store it in a document that other channel operators do not need. If several people manage the channel, use a secure handover method and remove exposed credentials according to your team’s process.
Some YouTube workflows also expose an ingestion URL or protocol choice. Use the current values shown for the actual event and destination rather than assuming that every YouTube setup uses the same endpoint. YouTube describes RTMPS as RTMP sent through an SSL connection and documents the current requirements in its guide to delivering live YouTube content through RTMPS.
Do not substitute HLS or DASH settings because they sound more modern, and do not assume that an RTMP example from another encoder applies unchanged. YouTube’s ingestion protocol comparison explains that the protocols have different characteristics for encryption, latency, codecs and delivery. In this Dacast workflow, follow the destination details that Dacast and YouTube provide for the connection you are actually making.
Save the destination after entering the key and any other required values. Saving is the point at which Dacast records the YouTube forwarding target. It is not the point at which your encoder begins broadcasting.
Enter the key, save, and check the result
After saving, return to the selected Dacast channel’s Simulcast area and look for the destination you just added. Confirm that it is listed as YouTube and that the configuration was accepted. If Dacast shows an error, record the wording before trying repeated changes.
A failed save has several plausible causes. The channel may not be eligible, the account may have exhausted its Simulcast credits, the key may be incomplete, or the YouTube event details may not match the key. Work through those possibilities in that order rather than deleting the Dacast channel or rebuilding the entire event.
If the key has been exposed or you are no longer sure which event it belongs to, generate or retrieve the current key in YouTube Studio and replace the saved destination with the correct value. YouTube’s live-stream resources document that ingestion information belongs to the live stream associated with the broadcast. The relevant detail is the active event’s stream information, not a generic key copied from an old setup.
Once the destination is saved, pause for the Dacast-specific check that is most often missed: inspect the encoder configuration again. Do this before starting the event, even if the destination appears healthy in the dashboard.
Recheck the Dacast ingest URL in your encoder
Adding a Simulcast destination can change the Dacast ingest URL. This is the step that separates a configured relay from a working relay. Your encoder may still contain the old Dacast URL, and a feed sent there may no longer reach the channel in the expected way.
Open the encoder’s Dacast output settings and compare the current ingest URL with the value shown by Dacast for the selected live channel. If Dacast provides a new URL, replace the old one in the encoder. Check the stream name, key or other associated fields as well, but do not alter values that Dacast has not asked you to change.
Save the encoder settings and confirm which output profile will be used when the encoder starts. If you have more than one scene, destination or streaming profile, it is easy to update one profile while the active profile continues using the previous URL.
Do not rely on a saved browser tab, a printed setup note or a URL from a previous event. The correct value is the one currently shown for the selected Dacast channel after the YouTube destination has been added. Dacast’s multi-destination channel guide specifically calls out checking the encoder after configuring additional destinations.
This change does not mean YouTube replaces Dacast as the encoder target. The encoder still sends to Dacast, and Dacast forwards the accepted feed to YouTube. If you point the encoder directly at an unrelated YouTube endpoint, you are no longer testing the Dacast Simulcast path described here.
For a channel expected to run overnight, write down the final Dacast URL location, the encoder profile name and the YouTube event title in your operations notes. Do not write the private stream key in an open note. The aim is to make the next check repeatable without creating another credential risk.
Start the encoder and verify both previews
When the destination is saved and the encoder uses the current Dacast ingest settings, start the encoder through its normal control. Watch for the encoder’s outgoing connection, then open the Dacast preview or shared stream page. Wait for the programme to appear there before judging the YouTube side.
Next, open the YouTube event in YouTube Studio and inspect its preview or live status. The two views answer different questions. Dacast confirms that the source is reaching the channel, while YouTube confirms that Dacast is forwarding a feed that YouTube can ingest for the selected event.
Use a short, deliberate verification rather than watching only one dashboard. Check that the picture is moving, audio is present, the event title is the intended one and the feed is not showing a stale frame. If your channel carries speech, listen for clear audio. If it carries music or ambience, check for silence and unexpected clipping.
Then confirm the public YouTube watch page when YouTube makes it available. Studio status and the public viewer experience are related but not identical. A creator preview can be receiving data while the event is still waiting for a go-live action, or the public page can remain unavailable until the event is started in YouTube Studio.
Starting the encoder is not always the same as starting the YouTube broadcast. Follow the event state shown by YouTube and use its current go-live controls where required. Do not describe the connection as tested merely because the encoder reports an outgoing connection.
For a long-running stream, keep the first test observable. Start during a period when you can check both destinations, rather than making the first attempt immediately before leaving for the night. This does not guarantee uninterrupted delivery, but it gives you a chance to find an incorrect URL, missing audio or wrong event before the channel is unattended.
If you are comparing this relay arrangement with an upload-once workflow, keep the distinction clear. A cloud service such as StreamNeo can remove the need to leave your own computer running by turning an uploaded file into a YouTube stream, whereas this Dacast procedure still depends on an existing encoder channel and its incoming live feed. That is a different operating model, not a change to what Dacast Simulcast does.
Troubleshoot the destination and go-live state
If Dacast shows the source but YouTube does not, begin at the boundary between the two services. Confirm that the YouTube destination is still saved on the correct Dacast channel and that the stream key belongs to the current YouTube event. Then check that the account still has the Simulcast access and credits needed for the destination.
If YouTube shows no incoming feed and Dacast also shows no source, do not start with the YouTube key. Recheck the encoder profile, network connection, Dacast ingest URL and channel selection. The new URL created or displayed after adding a destination is a particularly important check.
If Dacast has a preview but YouTube remains waiting, inspect the YouTube event state. The event may not be scheduled or started as expected, or the key may be associated with another live stream. YouTube’s current Studio wording and controls should take precedence over an old screenshot or a third-party guide.
If the YouTube destination was never accepted by Dacast, verify channel eligibility first. HLS ingest and VOD Rebroadcast channels do not satisfy the encoder-channel requirement described in Dacast’s Simulcast documentation. Also check for an account error indicating that Simulcast credits are unavailable.
If the feed reaches both services but the picture or sound is wrong, return to the encoder and source rather than repeatedly replacing the key. A silent source, the wrong scene, an unsupported encoding profile or a local network interruption can affect both destinations. The overnight failure checklist for a 24/7 stream is useful once the initial connection works and you are preparing for unattended operation.
If your local connection is shared by other streams, account for that before adding another always-on output. An article on running two 24/7 YouTube streams from one internet connection in India covers the practical questions around shared bandwidth and failure points. It does not replace checking the actual encoder and Dacast settings for this channel.
Avoid making several changes at once. Change one item, save it, restart or reconnect only where necessary, and inspect Dacast followed by YouTube. This gives you an evidence trail and prevents a successful fix from being hidden by a second unrecorded change.
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FAQ
Does Dacast Simulcast create the YouTube live event?
No. Simulcast forwards an existing eligible Dacast encoder live channel to a destination. You create or schedule the YouTube event separately, obtain its stream key, and start the source through the encoder.
Why should I check the Dacast URL after adding YouTube?
Dacast documents that adding a destination can change the encoder’s Dacast ingest URL. If the encoder keeps using an old value, the feed may not reach the expected Dacast channel after Simulcast is configured.
What should I check if Dacast is live but YouTube is not?
Confirm that the YouTube destination was saved on the correct Dacast channel and that the key belongs to the current YouTube event. Then inspect the YouTube event’s schedule and go-live state, and check that the Dacast account has the required Simulcast access and credits.
Can I use this setup with an HLS ingest channel or VOD Rebroadcast?
Dacast’s current Simulcast documentation describes the destination as being attached to an eligible encoder live channel and excludes HLS ingest and VOD Rebroadcast channels. Check Dacast’s current documentation and your account’s channel type before planning the connection.