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“Rejected” can mean FFmpeg cannot connect, YouTube receives the feed but marks it unhealthy, or the stream reaches YouTube with settings that do not match the selected stream key. Diagnose which is happening before changing parameters: check the full FFmpeg log and the exact Live Control Room stream-health message, then verify the key, output settings, encoder load, and the cloud server’s outbound connection.
First identify what “rejected” means
A cloud-hosted FFmpeg stream has two separate checkpoints: FFmpeg must send a feed to YouTube, and YouTube must be able to process that feed. A connection error in FFmpeg is different from a connected feed that YouTube flags as unhealthy. YouTube’s live-stream troubleshooting guide covers encoder startup, stream quality, CPU load, and connectivity; FFmpeg’s protocol documentation explains protocol options but does not diagnose YouTube account or ingest status.
Before troubleshooting, save the complete command with the stream key removed, the FFmpeg version and build configuration, the relevant log excerpt, and the precise warning shown in Live Control Room. Do not share a stream key: anyone who obtains it may be able to broadcast to your channel.
- FFmpeg cannot establish or start the output: prioritize the destination URL, stream key, selected protocol, and outbound network access.
- YouTube receives the feed but reports it as unhealthy: inspect codecs, bitrate, frame rate, keyframe interval, input audio/video, CPU load, and network stability.
- The stream connects but YouTube does not accept or process its settings: compare the actual output and selected key against YouTube’s current encoder requirements.
Use this diagnostic order
- Record the exact failure. Note whether FFmpeg reports a connection or publishing error, whether the Live Control Room preview receives video and audio, and the exact stream-health message. Keep logs from the failure rather than relying on a paraphrase.
- Confirm the destination and key. In YouTube Live Control Room, open the intended stream and copy its current stream URL and key. Make sure the key belongs to that stream and that the output protocol matches the stream-key configuration. YouTube advises copying a key from the Stream tab into the encoder for startup errors; if necessary, reset the key and update FFmpeg’s configuration. Store the key as a secret and redact it from logs or support requests.
- Match output settings to the selected key. Check the current YouTube encoder settings, bitrates, and resolutions for the specific codec, resolution, and frame rate. YouTube lists RTMP/RTMPS and H.264, H.265 (HEVC), and AV1 video, up to 60 fps; it recommends constant bitrate (CBR), a 2-second keyframe interval, and says not to exceed 4 seconds. Audio options listed are AAC and MP3. The bitrate table has separate rows for codecs, resolutions, and frame rates, so choose the matching row rather than borrowing a number from another format.
- Check FFmpeg’s input and encoding at the server. Confirm the input file or source is readable and that the output actually contains the intended video and audio streams. Read FFmpeg’s log for encoder errors, dropped frames, or output-rate problems. Check CPU utilization and relevant host metrics while the stream runs: a process under heavy load may fail to encode in real time, but confirm that from logs or metrics instead of assuming it is the cause. YouTube recommends checking the encoder’s picture and sound, dashboard errors, CPU load, and local archive media where available.
- Test the server’s outbound connection. The important capacity is upload from the cloud host to YouTube, not download speed to your laptop. YouTube recommends enough upload bandwidth for the total outgoing stream bitrate and 20% headroom. Its streaming tips note that “A disruption on your connectivity could mean a broken stream.” Check the VM’s egress policy, route, connection errors, and packet loss if your provider exposes them. Providers differ; consult your host’s current network documentation rather than assuming a universal firewall rule or port list.
- Test the exact workflow before relying on it. YouTube recommends RTMPS, the secure extension to RTMP. Test privately or as unlisted, inspect Live Control Room preview and stream health, and use representative motion and audio. Monitor the stream during use. YouTube says: “We recommend running a speed test to test your upload bitrate.”
Check FFmpeg command structure without copying a secret
FFmpeg’s documentation gives this generic example for sending a file in real time to an RTMP server:
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ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream
This is a schematic FFmpeg example for a generic server, not a tested YouTube command or a guarantee that a particular cloud host, key, or output configuration will work. Use the current ingest URL and key from the intended YouTube Live Control Room stream, and configure codecs and output settings for that stream. Never paste a real key into a public log, ticket, or command example.
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FFmpeg options can vary by installed version and build. Check the version and configuration reported by the installed binary, and verify that the chosen encoder and protocol options are supported there before treating an option as available.
Choose RTMP(S) or HLS for the right reason
| Choice | When it fits | What to verify |
|---|---|---|
| RTMP or RTMPS | YouTube recommends RTMPS for standard ingest. Use the protocol configured for the selected stream key. | Copy the matching ingest URL and current key; verify supported codec and settings in YouTube’s encoder table. |
| HLS | YouTube documents HLS for HDR or codecs not supported through RTMP. It is a distinct setup, not a general fix for a wrong RTMP key or bitrate. | Select an HLS protocol stream key in Live Control Room and use its HTTPS Stream URL. YouTube requires TS segments, segment durations of 1–4 seconds, no byte ranges, a rolling playlist with no more than 5 outstanding segments, HTTPS POST/PUT, and no encryption beyond HTTPS. |
YouTube says HLS has higher latency than RTMP because it sends segments rather than a continuous stream. Before switching, confirm the installed FFmpeg build and your output workflow support the required protocol and packaging. Changing to HLS will not correct a stale key, overloaded encoder, or blocked outbound route.
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Use reconnect options only for recoverable network failures
FFmpeg documents reconnect controls for some protocols and error conditions. They may help when a supported network error interrupts an otherwise valid stream, but they cannot repair a wrong key, unsupported output settings, CPU overload, or a persistently blocked route. Check the protocol documentation and the installed version’s option support before adding retry flags; reconnect settings do not guarantee a healthy YouTube stream.
Troubleshoot by symptom
| What you see | What to check next |
|---|---|
| FFmpeg fails to connect or start publishing | Re-copy the URL and current key from the intended Live Control Room stream; confirm protocol/key match and outbound access. If YouTube identifies a third-party encoder startup problem, try resetting the key and updating FFmpeg’s configuration. |
| YouTube preview receives a feed but flags it unhealthy | Compare codec, output bitrate, frame rate, and keyframe interval with the current YouTube table. Inspect FFmpeg’s output and audio/video input, then check CPU load and outbound bandwidth and stability. |
| Local playback looks fine, but YouTube’s feed breaks or stalls | A healthy local picture does not establish that cloud egress is stable. Check the host’s upload capacity, leave YouTube’s recommended 20% bandwidth headroom, and inspect provider network metrics and connection errors where available. |
| Retry flags reconnect, but the stream fails again | Determine whether the underlying fault persists. Retries cannot fix invalid credentials, unsupported settings, insufficient encoding capacity, or a blocked route. |
| You are considering HLS as a fix | Use it when its HDR/codec use case and required HLS setup fit. Confirm the HLS key, HTTPS URL, segment format, playlist, and request method; expect higher latency than RTMP. |
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