On a Linux host that uses systemd, run FFmpeg as a service and set Restart=on-failure. systemd can relaunch FFmpeg after qualifying process failures; FFmpeg’s own reconnect and output-recovery options address different network problems. If FFmpeg stays running but the lecture stream freezes, restart-on-failure alone will not detect that stall.
The operating system, FFmpeg version, input and output protocols, and streaming platform were not specified. The example below is therefore a systemd pattern for Linux, not a universal configuration or a tested drop-in service file. Check the documentation and options for the versions installed on your host.
Choose the recovery layer that matches the failure
A 24/7 stream can fail at different points. Reconnecting an input, recovering an output, relaunching an exited process, and detecting a frozen stream are separate jobs; one mechanism does not cover all four.
| Failure layer | What it can address | What it does not do |
|---|---|---|
| Input connection | FFmpeg protocol options can retry certain supported input disconnections. | They do not relaunch an FFmpeg process that has exited. |
| Output connection | The FFmpeg FIFO muxer has recovery options for certain output failures, particularly with network output. | It is not a general process supervisor. Queue overflow handling may drop packets. |
| Process exit | systemd can restart FFmpeg when it exits under the configured restart policy. | It does not establish that useful media is reaching viewers. |
| Stalled process | A separately designed health check or supported watchdog integration can monitor progress. | A basic exit-triggered restart policy does not detect every live-but-frozen process. |
The FFmpeg Project’s protocol documentation and muxer documentation describe the FFmpeg-side options. The systemd.service manual describes service restart behavior.
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Configure systemd to restart FFmpeg after failure
Use the actual FFmpeg command that already works on your host. Replace the sample executable path, service user, working directory, and arguments. The five-second delay is an example deployment choice, not a value prescribed by systemd documentation.
1. Create a service unit
For example, create /etc/systemd/system/lecture-stream.service with this pattern:
[Unit]
Description=FFmpeg lecture stream
Wants=network-online.target
After=network-online.target
[Service]
Type=simple
User=stream
WorkingDirectory=/srv/lecture-stream
ExecStart=/usr/bin/ffmpeg [your existing FFmpeg arguments]
Restart=on-failure
RestartSec=5s
[Install]
WantedBy=multi-user.targetExecStart must contain your real command and arguments; the bracketed text is explanatory and is not a valid argument. Use an absolute path to FFmpeg. Make sure the service account can read the input files, access any required credentials, and write to any required logs or output locations. Confirm the unit syntax and restart policy against the systemd version installed on the host.
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2. Load, enable, and start it
After saving the unit, the usual systemd workflow is:
sudo systemctl daemon-reload
sudo systemctl enable --now lecture-stream.serviceCheck whether it is active and inspect its recent journal output:
sudo systemctl status lecture-stream.service
sudo journalctl -u lecture-stream.service -n 100 --no-pagerKeep the journal available: after repeated restarts, the error preceding each exit is more useful than the fact that systemd tried again.
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3. Understand what Restart=on-failure means
According to the systemd.service manual, Restart=on-failure covers a non-zero exit, qualifying signal termination, operation timeouts, and triggered watchdog timeouts. A stop initiated through the service manager does not itself trigger an automatic restart. Thus, an administrative stop can remain stopped while an unexpected process failure is restarted.
A service that repeatedly exits may still be failing for the same underlying reason. Avoid an unbounded rapid restart cycle: inspect the journal, retain sensible spacing and rate-limit behavior, and fix the cause rather than treating repeated launches as recovery.
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HTTP input disconnects
The FFmpeg protocol documentation describes HTTP options including reconnect, reconnect_at_eof, reconnect_on_network_error, reconnect_on_http_error, and reconnect_streamed, along with delay and retry limits. Their applicability depends on the input protocol and the installed FFmpeg build. Confirm support and choose retry bounds for the outage behavior you expect; do not copy a flag blindly into a different protocol or build.
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The documentation distinguishes reconnection after a disconnect before end-of-file from treating end-of-file as an error for reconnection in live or endless streams. Whether that behavior is suitable depends on what the input is expected to do.
Network output failures
The FFmpeg muxer documentation describes the FIFO muxer’s attempt_recovery option for trying to recover from output failures, particularly with network output. It also documents drop_pkts_on_overflow, which can let encoding continue when a queue fills, at the cost of dropped packets. Decide whether that loss is acceptable for a lecture before relying on queue-overflow behavior.
These are FFmpeg-side output mechanisms, not substitutes for systemd when the FFmpeg process exits. Exact option syntax and availability should be checked in the documentation for the deployed build.
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Detect a stream that is frozen while FFmpeg is still running
systemd’s exit-based restart policy responds to the documented failure triggers; a process that remains alive may not trigger them simply because viewers see a frozen picture or hear no audio. To handle that case, define a measurable signal of expected output progress and build a deliberate monitor or supported watchdog design around it.
There is no universal stream-health test established here. The right signal depends on the input, output protocol, and how the lecture stream is produced. A monitor should distinguish a real stall from normal pauses, buffering, or an expected lack of new input, and its response should avoid creating a rapid restart loop.
Troubleshoot common restart and recovery problems
- FFmpeg exits but does not restart: inspect
journalctl -u lecture-stream.serviceand confirm the loaded unit hasRestart=on-failure. Check whether a wrapper script is hiding the failure by exiting successfully. - HTTP input keeps disconnecting: verify that the installed FFmpeg build and protocol support the reconnect options you intend to use, then review the retry and delay bounds against the expected outage.
- Network output fails intermittently: assess whether FIFO muxer recovery is appropriate for that output and whether packet loss on overflow would be acceptable.
- Viewers report a frozen stream, but the service is active: determine whether the process is still producing expected output. Add an appropriate health check or watchdog design; a running service status alone does not prove the stream is progressing.
- The service restarts too quickly or repeatedly: use the journal to find the original error and review restart spacing and rate-limit behavior. Do not treat repeated attempts as evidence that the stream has recovered.
- A manual stop is followed by an unexpected restart: distinguish a service-manager stop from a process failure. The documented systemd restart behavior does not treat a manager-initiated stop itself as a failure.
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