Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsOn a Linux host that uses systemd, run FFmpeg as a service and set Restart=on-failure. Systemd can relaunch FFmpeg when it exits because of a qualifying failure, but that setting does not fix every network error or detect every frozen stream. Use FFmpeg’s protocol reconnect options for supported input failures, FIFO recovery options for some output failures, and a separate health check if FFmpeg stays running without producing useful media.
The operating system and stream protocols were not specified, so the steps below apply specifically to Linux with systemd. Adapt the command and recovery options to your installed FFmpeg build and the protocols you use.
Choose the recovery layer that matches the failure
A 24/7 stream can fail at different points. These mechanisms complement one another; none is a universal substitute for the others.
| Failure | Mechanism | What it does—and does not do |
|---|---|---|
| Input connection drops | FFmpeg protocol reconnect options | Retries certain supported protocol errors. It does not relaunch FFmpeg after the process exits. |
| Output connection fails | FFmpeg FIFO muxer recovery options | Attempts recovery for supported output failures, particularly with network output. It does not restart an exited process. |
| FFmpeg exits with a qualifying failure | systemd service with Restart=on-failure |
Starts the process again under systemd’s documented restart conditions. It does not detect every stalled stream. |
| FFmpeg stays alive but the stream is frozen | A separately designed health check or watchdog | Can detect a defined lack of progress; you must decide what signal counts as unhealthy and how recovery should work. |
Run FFmpeg under systemd so it restarts after failure
Save a service unit as a starting pattern, replacing the executable path, account, working directory, and command with values for your host. This is not a tested drop-in file. The example uses a five-second restart delay as a deployment choice, not a systemd-prescribed value.
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[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.targetCheck the command and service account
Use an absolute path for FFmpeg. Replace the bracketed placeholder with the full arguments that already start your lecture stream; it is not literal syntax to leave in the unit. Make sure the service account can read the media and credentials it needs and can write required logs or output. A command that works in your interactive shell can fail as a service if it depends on a different working directory, environment variables, or user permissions.
Understand what the restart policy covers
According to the systemd.service manual, Restart=on-failure responds to 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. Check the installed systemd version and its documentation before deploying a unit, since behavior and syntax should be verified for the host you operate.
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Apply and inspect the unit
- Save the unit in the location used by your Linux distribution’s systemd administration workflow.
- Use the host’s normal systemd procedure to reload unit definitions, enable the service if it should start at boot, and start it.
- Inspect the service status and journal logs. Confirm FFmpeg starts with the intended command and that logs are retained for diagnosing repeated failures.
- After a controlled failure test appropriate to your environment, verify that systemd starts the process again and review the journal for the exit reason.
Do not configure rapid, unbounded restarts as a substitute for finding the underlying fault. Restart spacing and systemd rate limits matter when a command fails immediately on every attempt.
Use FFmpeg reconnect options for supported input failures
For HTTP inputs, FFmpeg documents options including reconnect, reconnect_at_eof, reconnect_on_network_error, reconnect_on_http_error, and reconnect_streamed, along with retry-delay and retry-limit controls. The exact flags and their behavior depend on the protocol, option placement, and installed FFmpeg build. Consult the FFmpeg Protocols Documentation and verify support before adding flags to a live command.
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reconnectis documented for automatic reconnection after a disconnect before EOF.reconnect_at_eoftreats EOF as an error for reconnection in live or endless streams.- Other reconnect options target specified network or HTTP error cases; set delay and retry bounds to suit the expected outage rather than assuming retries will continue indefinitely.
These options address particular input-side conditions. They do not provide a general process supervisor, and an input protocol other than HTTP may have different recovery support.
Consider FIFO recovery for network output failures
FFmpeg’s FIFO muxer documents attempt_recovery for attempting to recover after output failures, particularly with network output. It also documents drop_pkts_on_overflow, which can allow encoding to continue when a queue fills, at the cost of dropped packets. See the FFmpeg muxers documentation and assess whether packet loss is acceptable for your lecture.
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FIFO recovery operates inside FFmpeg. It is not equivalent to restarting FFmpeg after it exits, and it cannot guarantee that every output error will be recoverable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Detect a stalled stream separately
Restart=on-failure is triggered by process outcomes; it does not establish that a still-running process is sending fresh media. If viewers report a frozen stream while FFmpeg remains alive, define a measurable health signal—such as expected output progress—and build a deliberate monitor or supported watchdog integration around it. The systemd restart policy alone does not prescribe a universal stream-health test.
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Troubleshoot common restart and recovery problems
- FFmpeg exits and does not return: Inspect the service journal and exit reason. Confirm that the unit has
Restart=on-failureand that a wrapper script is not converting an FFmpeg failure into a successful exit. - An HTTP input disconnects: Check the installed FFmpeg build and input protocol for the relevant reconnect options. Tune retry limits and delays to match the outages you expect.
- Network output fails temporarily: Consider FIFO muxer recovery and decide whether dropping queued packets is acceptable. FIFO recovery will not relaunch an exited process.
- Viewers see a frozen stream, but FFmpeg is still running: Check for measurable output progress and implement an appropriate monitor or watchdog. A process that has not exited will not be restarted merely because viewers cannot see progress.
- The service repeatedly restarts or fails immediately: Review the journal, FFmpeg command, permissions, working directory, network dependency, and restart spacing. Repeated relaunches are evidence to diagnose, not proof that recovery is working.
- A manual stop is followed by no restart: That is expected when the service manager initiated the stop. Distinguish an administrative stop from a process failure.
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