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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesIn YouTube Live, the stream URL is the destination your encoder sends video to; the stream key goes in a separate field. “Backup URL” can mean a second encoder ready to take over, or the protocol-specific Backup server URL shown in YouTube’s HLS setup. Those are different things: don’t treat the HLS address as a general RTMP fallback.
What is the difference between primary and backup URL on YouTube?
Usually, “primary” and “backup” describe two encoder setups, not a universal pair of RTMP server addresses. The primary encoder sends the main feed. A separately configured backup encoder can take over if the primary fails. YouTube recommends testing that handoff by stopping the primary encoder or disconnecting its Ethernet cable, then confirming playback rolls over to the backup. A configured backup is not proof that failover works. YouTube’s streaming tips describe the test.
There is also a distinct field labeled “Backup server URL” in YouTube’s HLS setup. It belongs to the HLS ingestion workflow; it is not a general-purpose secondary RTMP URL. YouTube documents HLS for HDR or codecs unsupported by RTMP. Its HLS setup instructions explain the protocol-specific addresses.
Which YouTube RTMP server URL should I use?
Use the stream URL shown for the specific stream in YouTube Live Control Room, with the protocol selected for your encoder. Put that URL in the encoder’s server or URL field, and paste the matching stream key into the separate Stream Key field. YouTube says the URL tells the encoder where to send the feed; its stream key is sensitive, “like a password and address.” See Manage live stream settings and Create a YouTube live stream with an encoder.
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- RTMP: Select the RTMP workflow and use the RTMP URL supplied for that stream.
- RTMPS: Use the RTMPS URL when your encoder supports encrypted RTMP over TLS/SSL. YouTube says to retrieve the URL from Live Control Room. Its RTMPS instructions advise checking that both the protocol and server use
rtmpsif you encounter SSL errors; port 443 may be relevant when the encoder lets you specify a port. - HLS: Choose HLS for the stream’s protocol and use its HLS Stream URL with a compatible HLS encoder. If the HLS setup calls for backup ingestion, copy the separate HLS Backup server URL it displays.
Do not copy an example address, reuse a URL from another scheduled stream, or swap an HLS address into an RTMP field. The correct values depend on the intended stream and protocol; check the current stream’s Live Control Room settings.
Do I put the stream key in the URL field?
No. Enter the server URL in the encoder’s server field and the stream key in its separate key field. Keep the key private: anyone with access to it may be able to send a feed to your stream. If you believe it has been exposed, review the stream’s settings in Live Control Room and replace or reset the key using the controls available there.
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How to configure and test the right destination
- Open the intended stream in YouTube Live Control Room. Confirm you are editing the correct scheduled or ongoing stream and inspect its protocol and settings.
- Copy both values from that stream: paste its stream URL into the encoder’s server/URL field and its stream key into the separate Stream Key field.
- Match protocol to encoder: for RTMPS, confirm the URL uses
rtmpsand the encoder supports it. For HLS, select HLS and use the HLS Stream URL; use its Backup server URL only for the HLS backup-ingestion setup. - Check the preview and stream health before the event. Confirm the watch page is accessible and that the feed reaches the intended stream.
- If relying on redundant encoders, test the handoff: stop the primary encoder or unplug its Ethernet cable, then verify that the player rolls over to the backup. Restore the primary only after the test is complete.
- Allow upload headroom. YouTube recommends 20% upload bandwidth headroom and describes the allowance as “primary + backup + 20%.” This is a recommendation, not a guaranteed outcome or universal service limit. See Streaming tips.
For resolution and bitrate choices, follow YouTube’s current encoder settings, bitrates, and resolutions guidance and verify that your encoder’s output matches the stream you intend to send.
Troubleshooting URL and failover problems
- The encoder connects to the wrong stream: the URL or key may have been copied from a different scheduled stream. Reopen the intended stream in Live Control Room and copy both values from its settings.
- The encoder rejects the key or cannot authenticate: ensure the key is in the Stream Key field, not appended to or substituted for the server URL. Confirm it belongs to the selected stream.
- RTMPS reports an SSL error: check that the encoder supports RTMPS and that the protocol and server address use
rtmps. If the encoder supports a port setting, YouTube notes port 443 may be relevant. Consult YouTube’s RTMPS guidance. - An HLS backup address does not work in an RTMP encoder: it is protocol-specific. Use the HLS setup with a compatible encoder, or return to the RTMP/RTMPS values supplied for that stream.
- The backup encoder is configured but playback does not roll over: run YouTube’s failover test before the event and check the backup encoder’s settings and network path. A backup URL alone does not establish that the encoder handoff is configured or functioning.
- The stream is unstable under dual-encoder operation: check available upload capacity for both feeds plus headroom. YouTube recommends 20% above the combined primary and backup requirement; actual network performance can vary.
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