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To keep a YouTube stream running after an encoder process fails, run the encoder as a systemd service with Restart=on-failure. Add WatchdogSec= only if the service or a wrapper actually sends systemd periodic WATCHDOG=1 notifications; that setting does not monitor an arbitrary FFmpeg or OBS process by itself. A separate system-level watchdog, RuntimeWatchdogSec=, depends on a watchdog device exposed to the VM.
Choose the right kind of watchdog
“Watchdog” can mean two different systemd mechanisms. For a YouTube encoder, start with service restart behavior. Consider a service watchdog only when you can provide meaningful heartbeats, and consider a hardware watchdog only if your cloud provider exposes a compatible device.
| Mechanism | What it supervises | Requirement | Typical response |
|---|---|---|---|
WatchdogSec= |
One systemd service | The service or its wrapper periodically sends WATCHDOG=1 over systemd’s notification socket. |
A missed deadline marks the service failed; systemd’s Restart= policy determines whether it starts again. |
RuntimeWatchdogSec= |
System responsiveness through a watchdog device | The VM must expose a compatible hardware or virtual watchdog device. | The device may reboot the machine if systemd stops servicing it. |
Systemd’s service documentation says the watchdog is activated after service startup completes. Its hardware-watchdog documentation says the setting has no effect when a hardware watchdog is unavailable. Do not assume an unspecified Indian cloud VM includes one.
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- Confirm the environment. Check the Linux distribution, whether it uses systemd, and the installed systemd version. Consult that version’s local manual for supported directives and restart rate limits; upstream systemd documentation is rolling.
- Check device exposure. Look for
/dev/watchdogor/dev/watchdog0and verify with the provider whether the instance supports a virtual watchdog. Device presence and behavior are provider- and instance-dependent. - Check the network path. Confirm the VM has sustained outbound capacity above the selected video bitrate, with headroom for variation. Test from the actual VM and region rather than assuming the advertised instance bandwidth will be available to the stream.
- Choose a recovery policy. Use
Restart=on-failureif abnormal exits should restart but a clean exit should remain stopped. UseRestart=alwaysonly if even a clean encoder exit should relaunch.
Create the YouTube ingest details
- In YouTube Studio’s Live Control Room, create or select the broadcast and copy its server URL and stream key into your encoder configuration.
- Treat the stream key as a password. Store it in a protected configuration file or environment file readable only by the service account; do not put it in a world-readable unit, command log, or public repository. If it is exposed, reset it in Studio and update the encoder.
- Set the broadcast’s auto-start and auto-stop options if the intended lifecycle should be controlled by the encoder.
- Test before using the broadcast continuously. Review the Live Control Room preview, stream health, and any warnings before relying on the ingest.
Run the encoder as a restartable systemd service
The following is a unit-file pattern, not a provider-tested configuration. Replace the executable, arguments, user, working directory, and environment-file path for your distribution and encoder. The example uses placeholders rather than assuming a particular FFmpeg command, input, or key format.
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- Create
/etc/systemd/system/youtube-stream.servicewith an appropriately restricted editor and add:[Unit] Description=YouTube live stream encoder Wants=network-online.target After=network-online.target [Service] Type=simple User=stream WorkingDirectory=/srv/youtube-stream EnvironmentFile=/etc/youtube-stream/stream.env ExecStart=/usr/bin/ffmpeg [your encoder arguments] Restart=on-failure RestartSec=5 [Install] WantedBy=multi-user.targetReplace
[your encoder arguments]with the actual arguments for your encoder; square-bracket text is explanatory, not valid FFmpeg syntax. Ensure the chosen user can read the input files and environment file. Protect the environment file with restrictive ownership and permissions, and avoid expanding secrets into logs. - Reload unit definitions and enable the service at boot:
sudo systemctl daemon-reload sudo systemctl enable --now youtube-stream.service - Check its state and recent logs:
sudo systemctl status youtube-stream.service sudo journalctl -u youtube-stream.serviceUse
journalctl -u youtube-stream.service -fwhen you need to follow new log entries. Confirm the encoder remains active and that YouTube reports a healthy incoming stream.Rank #2
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RestartSec=5 is a modest example delay, not a universal optimum. Check the installed systemd manual’s start-rate limiting behavior if repeated failures stop the service from restarting. Restart=on-failure handles abnormal process exits; it does not by itself detect every case where a process is alive but no longer sending useful video.
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A service watchdog is useful only if the program or wrapper implements systemd’s notification protocol. When watchdog supervision is configured, systemd provides WATCHDOG_USEC=; the systemd notification API guidance recommends sending keep-alive messages at about half the advertised timeout. For example, a 30-second timeout implies a heartbeat interval around 15 seconds, not a heartbeat that waits until the deadline.
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For a notification-capable service, the unit can include settings such as:
Type=notify
NotifyAccess=main
WatchdogSec=30
Restart=on-failure
RestartSec=5Use these only when the main service process sends startup/status notifications as required by Type=notify, and continues sending watchdog notifications while it is healthy. A basic FFmpeg invocation does not become notification-capable merely because WatchdogSec=30 is added. Use a notification-aware wrapper or supervisor, and design its health check to stop heartbeating if the encoder exits or its relevant health check fails. A wrapper that keeps pinging while a child encoder is dead or wedged defeats the watchdog.
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Configure YouTube-compatible encoder output
YouTube’s current encoder guidance recommends RTMPS, constant bitrate (CBR), and a two-second keyframe interval; the interval must not exceed four seconds. Its H.264 recommended video ingest bitrates include:
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| Output | Recommended H.264 video bitrate |
|---|---|
| 1080p at 30 fps | 5 Mbps |
| 1080p at 60 fps | 6 Mbps |
These are YouTube ingest recommendations, not a guarantee of the VM’s available bandwidth or a cloud egress price. YouTube lists other rates by codec, resolution, and frame rate; use its current guidance for the actual output profile. Set audio and video parameters deliberately in the encoder, and confirm the stream health in Studio rather than inferring successful delivery from a running process.
Test restart behavior and stream continuity
- Start a test broadcast and confirm that Studio receives a preview with healthy stream status.
- In a planned maintenance window, stop the service or terminate its encoder process. With
Restart=on-failure, an abnormal termination should cause systemd to launch it again after the configured delay. - Run
sudo systemctl status youtube-stream.serviceandsudo journalctl -u youtube-stream.serviceto inspect its state, restart history, and errors. - Verify the result from both sides: systemd should show the service running, and YouTube should show the expected incoming stream. A running service alone does not prove that viewers are receiving useful video.
YouTube recommends testing before going live and monitoring stream health and messages during the event. Plan the broadcast and archive workflow separately: YouTube says streams under 12 hours are automatically archived. Do not assume a stream longer than that will produce one complete VOD archive.
Troubleshoot common failures
| Symptom | Likely cause | What to check or do |
|---|---|---|
| Service exits and stays stopped | The unit is not enabled, has a configuration error, or restart rate limiting has been reached. | Inspect systemctl status and journalctl -u; validate the command, permissions, and unit syntax, then review the installed systemd manual’s rate-limit behavior. |
WatchdogSec= appears set but a hung encoder is not restarted |
The process does not send systemd watchdog notifications, or a wrapper is still pinging despite an unhealthy child. | Use a notification-capable wrapper or supervisor whose heartbeat reflects encoder health; otherwise rely on process-exit restart behavior and an appropriate health-check design. |
| System-level watchdog has no effect | No compatible watchdog device is exposed to the guest, or the device is not supported by the provider/instance. | Check device nodes and provider documentation. Do not treat RuntimeWatchdogSec= as service-level encoder supervision. |
| Service runs but YouTube shows no healthy ingest | Wrong server URL or key, key revoked or exposed, output configuration mismatch, or insufficient/unstable upload path. | Check the Live Control Room settings and stream-health messages; reset a compromised key, update the protected configuration, and test sustained upload from the VM. |
| Stream drops or video stalls under load | The encoder’s bitrate may exceed stable upload capacity, or output parameters may not match the desired profile. | Measure actual sustained capacity with headroom, verify CBR and keyframe settings, and reduce the profile if the path cannot sustain it. |
| A 24/7 broadcast does not yield one complete archive | The broadcast exceeds YouTube’s documented automatic archive condition. | Keep the under-12-hour archive condition in mind and plan any broadcast rotation around the channel’s archive workflow. |
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