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DigitalOcean

How to Keep FFmpeg Running After an SSH Disconnect on DigitalOcean

Use tmux for a reconnectable FFmpeg terminal, systemd for managed lifecycle and logs, or nohup for a basic detached command. Add -nostdin and verify the process after reconnecting.

By DocumentaryTube Team 5 min read
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To keep an FFmpeg job running after you disconnect from a DigitalOcean Droplet, run it inside a detached tmux session or manage it with a systemd service. For a one-off job you may want to reconnect to, tmux is usually the simplest choice. Add -nostdin so FFmpeg does not check for interactive input. An SSH disconnect alone is not a guarantee that a foreground process will survive.

Choose the method that fits the job

Method Best for Reconnect to the live terminal? Service supervision or restart policy? Main caution
tmux A one-off job where you want to return to its terminal Yes No Manage job status and logs; detaching does not supervise FFmpeg.
systemd A process that should be managed by the server, with status and journal logs No Yes, according to the unit configuration Choose restart and boot behavior deliberately, especially for a one-time encode.
nohup A simple detached command with redirected output No No You must manage output, process checks, and failures yourself.

These are Linux process-management approaches for a Droplet, not a DigitalOcean-specific persistence guarantee. DigitalOcean’s SSH connection and troubleshooting documentation explains access to a Droplet; it does not promise that an arbitrary foreground process will persist when SSH disconnects.

Run a one-off job in tmux

A detached tmux session keeps the terminal session available on the Droplet so you can reattach after reconnecting over SSH. Install tmux with the package manager for your Droplet’s Linux distribution if it is not already installed.

  1. Start a named session: tmux new -s ffmpeg.

  2. Run your actual FFmpeg command inside it, for example: ffmpeg -nostdin -i INPUT -c:v libx264 OUTPUT.mp4.

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    INPUT and OUTPUT.mp4 are placeholders. Replace them with your real paths and use codecs and options appropriate to the source and destination; libx264 is illustrative, not a universal recommendation.

  3. Detach without closing the session by pressing Ctrl-b, then d. You can then disconnect SSH.

  4. After reconnecting, list sessions with tmux ls and reattach with tmux attach -t ffmpeg.

If FFmpeg has exited, reattaching may show its final terminal output. Terminal scrollback may not be enough for diagnosis, so save a separate log when you need a durable record.

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Manage a job with systemd

Use a systemd unit when you want the server to manage the process lifecycle, expose status, and collect service logs. The following is a minimal example to adapt; use an absolute FFmpeg path, explicit arguments, real file paths, and an appropriate working directory.

[Unit]
Description=FFmpeg job

[Service]
Type=simple
WorkingDirectory=/path/to/job
ExecStart=/usr/bin/ffmpeg -nostdin -i /path/to/input -c:v libx264 /path/to/output.mp4
Restart=no

[Install]
WantedBy=multi-user.target
  1. Create the unit file with appropriate administrator permissions, for example as /etc/systemd/system/ffmpeg-job.service. Confirm the FFmpeg executable path on your Droplet; /usr/bin/ffmpeg is an example.

  2. Reload unit definitions: sudo systemctl daemon-reload.

  3. Start the job: sudo systemctl start ffmpeg-job.service.

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  4. Check its state with systemctl status ffmpeg-job.service and inspect its logs with journalctl -u ffmpeg-job.service.

  5. Enable it at boot only if that is the intended behavior: sudo systemctl enable ffmpeg-job.service. A one-off encode may already be complete when the Droplet boots again, so boot enablement is not automatically appropriate.

Set Restart= for the workload you actually have. A successful one-time transcode normally should not be restarted after it exits successfully. The systemd service and journal manuals describe the available restart and log behavior; options can vary with the systemd version installed on the Droplet.

Use nohup for a basic detached command

If you do not need to return to a live terminal and do not need a service manager, this shell pattern redirects output to a log and stdin from /dev/null:

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nohup ffmpeg -nostdin -i INPUT OUTPUT >ffmpeg.log 2>&1 < /dev/null &
printf '%sn' "$!"

Save the PID printed at launch and check whether the process is still present after reconnecting. A PID by itself is not a health check: the job may have exited. This approach has no built-in restart policy or attachable terminal. Shell behavior may vary, so validate the command on the Droplet’s shell and installed packages.

Why -nostdin matters

FFmpeg’s FAQ explains that it normally checks console input and documents -nostdin to prevent those input checks when running in the background. It also documents redirecting stdin from /dev/null on Linux and macOS. Without that handling, a background process may suspend while checking for terminal input. Put -nostdin in the FFmpeg invocation when it should not accept console input.

FFmpeg’s command-line documentation is regenerated nightly, so if behavior differs, check the documentation for the FFmpeg version installed on your Droplet.

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Troubleshoot a job that stops or disappears

  • FFmpeg appears suspended or reports a terminal-input problem: make sure it is not waiting on console input. Use -nostdin, or redirect stdin from /dev/null as appropriate.

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  • You cannot find the tmux session: run tmux ls after reconnecting. Make sure you detached with Ctrl-b, then d, rather than exiting the shell or closing the session.

  • A systemd job is not running: inspect systemctl status ffmpeg-job.service and journalctl -u ffmpeg-job.service. Check the unit’s executable and arguments, working directory, and access to the input and output paths.

  • A nohup job has no useful output: check the redirected log file and verify whether the process is still running. The saved PID can help identify the launched process, but does not establish that the job completed successfully.

  • The process started but FFmpeg failed: inspect its output and logs. Incorrect paths or permissions, unavailable inputs, full output storage, expired credentials, or a remote source disconnect can stop a job even if the process survives the SSH session.

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  • The job stopped after a Droplet reboot or another server failure: session persistence only addresses the SSH-disconnect problem. It does not guarantee survival through a reboot, host failure, out-of-memory termination, or FFmpeg failure. A service manager can apply a configured restart policy, but cannot guarantee successful completion of a media job.

Or let it run in the cloud

If your goal is specifically to keep uploaded, prerecorded videos looping as a YouTube live stream, that is different from running an arbitrary FFmpeg command on a Droplet. StreamNeo is a cloud service for keeping a YouTube channel live from uploaded videos: upload a recording or make a playlist, add your YouTube stream key, and go live. Nothing has to stay on at home; it streams the uploaded video as made, up to 4K 60fps, at one price per slot, and automatically recovers if YouTube drops the stream. It does not stream from a camera or run general-purpose FFmpeg jobs.

The first day is free with no card. Monthly pricing is $9.99 per month. See StreamNeo or its plans, then start the free day.

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