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A YouTube stream key is documented as reusable; YouTube’s setup guidance does not describe a routine expiration period for custom keys. So an apparent “expired key” message is a symptom to investigate, not proof that YouTube automatically expires a key during a 24/7 broadcast. In YouTube Studio’s Live Control Room, verify the selected stream’s key and stream URL, compare both with FFmpeg’s output settings, then use the exact FFmpeg and YouTube error messages to distinguish a credential mismatch from a connection or process failure.
First, check whether the key actually expired
YouTube describes a stream key as the credential that lets an encoder send a feed to the right stream, and recommends a custom key when you want to reuse one. Its published setup guidance does not state that a correctly configured custom key routinely expires. YouTube Help describes stream keys as “like your YouTube stream’s password and address” (Manage live stream settings).
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A changed, reset, or mismatched key can prevent an encoder from starting. But a stopped broadcast can also result from a wrong stream URL, a network interruption, an FFmpeg exit, or a YouTube-side stream-health issue. Without the exact error and logs, the title alone cannot establish which occurred.
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Verify the Live Control Room destination and credentials
- Open the intended stream in YouTube Studio. Go to Live Control Room and inspect its selected stream key and stream URL. Make sure you are looking at the stream FFmpeg is meant to publish to, not another event or stream.
- Check whether the key was reset or replaced. If it was, the old value in FFmpeg will no longer be the current configured value. YouTube’s troubleshooting for an encoder start error instructs users to get a key from Live Control Room and paste it into the encoder (Manage live stream settings; Troubleshoot live stream issues).
- Compare both settings in FFmpeg. The stream URL and key are separate pieces of the publishing destination. Confirm that the configured output uses the current URL and key together. If you updated one but not the other, correct the configuration and restart the publishing process.
- Protect the key. Treat it like a password: do not include it in screenshots, public logs, or shared command lines. If it has been exposed, reset it in YouTube Studio and update the encoder to use the replacement.
Use the error and stream health to find the failure type
Check FFmpeg’s stderr output and YouTube Live Control Room’s incoming preview and stream-health messages at the time the broadcast stops. YouTube recommends testing an encoder setup and monitoring stream health; it also recommends RTMPS for encoder ingestion (Choose live encoder settings, bitrates, and resolutions).
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| What you observe | What to check next |
|---|---|
| An authentication rejection or encoder-start error | Recheck that the current key and URL belong to the selected stream. If the key was reset or replaced, update FFmpeg with the current value. |
| A connection-loss message while FFmpeg remains running | Investigate the network path and the timing of the interruption. Check the YouTube stream-health message alongside FFmpeg stderr. |
| FFmpeg exits or stops producing output | Inspect the exit/error output and determine whether the process stopped, rather than assuming the key expired. |
| YouTube shows a stream-health or account-side error | Use the exact Live Control Room message to identify the next corrective step; the symptom alone does not identify a key problem. |
These are diagnostic branches, not a diagnosis of your machine. The exact FFmpeg stderr excerpt, YouTube status message, whether the key changed, and whether FFmpeg stays running are needed to narrow down a particular incident.
Do not confuse reconnection with renewing a key
FFmpeg offers reconnection options for certain protocol operations, but those are not a way to renew an invalid publishing credential. The relevant FFmpeg protocol documentation describes RTMP and reconnection behavior in its protocol-specific contexts; check whether an option applies to the operation you are performing before relying on it (FFmpeg protocol documentation). If YouTube rejects the configured publishing key, reconnecting with the same rejected key does not replace it.
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Check 24/7 stream continuity and archive expectations separately
YouTube says streams under 12 hours are automatically archived (Archive live streams). That is an archive-duration consideration for a continuous 24/7 broadcast, not evidence that a stream key expires after 12 hours. Treat archive behavior and key authentication as separate issues.
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