You can keep a prerecorded video streaming to YouTube from a Debian VPS by running FFmpeg as a supervised service. The setup is not a single “set and forget” command: you must prepare a compatible source, use the current RTMPS URL and stream key from YouTube Live Control Room, test the feed, and monitor both FFmpeg and YouTube’s stream health.
This guide covers a file-based stream. It does not assume a camera, capture card, or generated live feed. FFmpeg’s loop and restart options can help, but neither guarantees uninterrupted delivery after every fault.
What you need before you start
- A Debian VPS with enough sustained outbound capacity and monthly transfer allowance for your chosen stream bitrate.
- A media file accessible on the server, such as
/srv/stream/program.mp4, with video and audio that FFmpeg can decode. - A YouTube channel enabled for live streaming and access to its Live Control Room.
- An FFmpeg build that includes the encoders and protocols you intend to use. Verify the available build on the actual VPS before relying on it.
Choose a VPS by checking its sustained outbound rate against the combined video, audio, and transport traffic; monthly transfer allowance; CPU capacity if you will encode with software; network route and region; reboot and recovery controls; and support and uptime terms. These vary by provider and plan, so check the exact offer you intend to use rather than assuming a VPS label guarantees suitable performance.
Install and inspect FFmpeg on Debian
Install the Debian package using the system package manager, then confirm the executable and build configuration. Package versions and available encoders depend on the Debian release and repositories configured on the host.
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- Refresh package metadata and install FFmpeg:
sudo apt update && sudo apt install ffmpeg. - Check the installed version:
ffmpeg -version. - Confirm the desired encoder is available:
ffmpeg -encoders | grep -E 'libx264|aac'. - Inspect the media file before streaming:
ffprobe -hide_banner /srv/stream/program.mp4. Note its video and audio codecs, dimensions, frame rate, duration, and audio layout.
If the expected encoder does not appear, check the package and build available for your Debian release before constructing the command. Do not assume that a command using libx264 will work on every FFmpeg build.
Choose a YouTube-compatible output profile
YouTube recommends RTMPS, H.264, H.265 (HEVC), or AV1 video, frame rates up to 60 fps, constant bitrate (CBR), and a 2-second keyframe frequency; it says not to exceed 4 seconds. Stereo audio recommendations are AAC or MP3 at 44.1 kHz and 128 kbps. The platform’s figures are recommendations, not proof that a particular VPS can sustain the required output. See YouTube’s encoder settings and bitrate guidance.
| Example output | YouTube-recommended video bitrate |
|---|---|
| H.264, 720p30 | 5 Mbps |
| H.264, 720p60 | 8 Mbps |
| H.264, 1080p30 | 14 Mbps |
| H.264, 1080p60 | 17 Mbps |
| H.265 or AV1, 720p30 or 720p60 | 6 Mbps |
| H.265 or AV1, 1080p30 | 10 Mbps |
| H.265 or AV1, 1080p60 | 12 Mbps |
The table lists YouTube’s current recommended video bitrates, not minimum VPS capacity. Leave headroom for audio, protocol overhead, and network variation. The example below uses H.264 at 720p30, whose recommended video bitrate is 5 Mbps; it is an example profile, not a universal requirement. The command does not scale or change resolution, so use it only if the input already matches the intended format, or add and validate appropriate filters and output settings.
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YouTube’s SDR guidance also specifies square pixels, progressive scan, two B-frames, one reference frame, CABAC, Rec. 709 color, and 8-bit depth. HDR has different requirements: YouTube recommends H.265 over RTMP(S) for HDR and says HLS may be considered when an encoder lacks the required RTMP capabilities. Do not apply SDR settings as though they were an HDR profile.
Create or schedule the YouTube broadcast and get its RTMPS details
- Open YouTube Live Control Room and create a live stream or schedule one.
- Open the stream’s settings and reveal the RTMPS URL with the lock icon, following YouTube’s current RTMPS setup instructions.
- Copy the exact RTMPS URL and stream key shown for your account. Verify that the protocol is
rtmps; YouTube may show an ordinary RTMP address by default. - Follow the account’s instructions for how the key combines with the server URL. Some setups expect the key appended to the server address; do not assume an old example endpoint or URL shape applies to your stream.
Treat the stream key like a password. Keep it out of source control, public logs, shell history, screenshots, and world-readable service files. Store it in a protected configuration or credential mechanism accessible only to the service account. If it is exposed, rotate it through YouTube’s controls. YouTube’s SSL troubleshooting advises checking that both protocol and server are correct and suggests port 443 if an SSL error persists.
Prepare a file-based FFmpeg stream
For stored media, FFmpeg’s -re option reads the input at its native frame rate so it is paced in real time instead of being sent as fast as the server can read it. Put it before the input it applies to. FFmpeg documents RTMP and RTMPS URL handling in its protocol documentation.
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The following is an illustrative command pattern, not a tested command. Replace the placeholders with the exact account-facing URL and key instructions from Live Control Room. The input should already be compatible with the selected output profile; verify this before depending on it.
ffmpeg -re -stream_loop -1 -i /srv/stream/program.mp4
-c:v libx264 -preset veryfast -b:v 5M -maxrate 5M -bufsize 10M
-r 30 -g 60 -keyint_min 60 -sc_threshold 0
-c:a aac -b:a 128k -ar 44100
-f flv "${YOUTUBE_RTMPS_URL}/${YOUTUBE_STREAM_KEY}"-stream_loop -1repeats this input indefinitely. That is suitable only if repeating the same file is the intended programme. A playlist or a sequence of different files needs a workflow designed for those inputs; there is no single universal looping command for every playlist.-g 60and-keyint_min 60represent 60 frames, or two seconds at 30 fps. At a different frame rate, change the GOP/keyframe interval to preserve the intended two-second frequency. Do not exceed four seconds.-b:v,-maxrate, and-bufsizeare example rate-control settings. Check the resulting stream against YouTube’s guidance and the VPS’s real sustained egress.- The URL expression assumes the key is appended. If Live Control Room gives a complete URL or a different arrangement, follow those instructions instead. Confirm the final URL shape with a short test.
For secure transport, use the RTMPS URL from Live Control Room. FFmpeg’s RTMP protocol options include TCP keepalive, but a keepalive is not application-level reconnection, a process watchdog, or a guarantee of delivery.
Test before leaving the stream unattended
- Run the command interactively with a representative test source using the intended audio, movement, resolution, and frame rate.
- Check that FFmpeg starts without input, encoder, or connection errors and that output continues at the expected pace.
- Open the preview in Live Control Room and inspect the stream-health status and any messages before relying on the feed.
- Confirm that the broadcast is scheduled, started, or ended as intended; a running encoder process does not itself manage the broadcast lifecycle.
YouTube explicitly recommends testing before starting a live stream. Its health guidance identifies issues including unsupported audio or video codecs, bitrate that is too low, frame-rate mismatch, mismatched keyframe frequency, and insufficient incoming video that can cause viewer buffering. The Live Streaming API treats the incoming feed (liveStream) separately from a broadcast (liveBroadcast), and a feed can be associated with broadcasts: YouTube LiveStreams API documentation.
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Run FFmpeg under systemd and retain logs
For an always-on deployment, use a system service to start FFmpeg after boot, run it as a dedicated unprivileged account, restart it when the process exits, and keep logs somewhere you can inspect. Validate the unit on the Debian release you are running. A restart policy such as Restart=always can relaunch a process that exits; it cannot detect every stalled input or unhealthy remote ingest, and it does not guarantee uninterrupted service.
Keep the stream key out of the unit file if that file is readable by other users. Put secrets in a protected configuration or credential file with permissions limited to the service account. Use the service manager’s logs to diagnose failures, and check that the chosen logging approach will not fill the disk during a long run. Exact unit details depend on the targeted Debian release and the way you store credentials, so test boot startup, process restart, and log access before relying on the service.
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Check the host and YouTube side together: a process can appear active while its input is stalled or YouTube is not receiving a healthy feed.
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| Symptom | What to check | Response |
|---|---|---|
| FFmpeg exits or repeatedly restarts | Service state and restart count; recent FFmpeg stderr or journal output; input path and file access; encoder availability | Fix the reported input, permission, or build issue, then test the command interactively before returning it to service. |
| YouTube reports an unsupported codec | Actual audio and video codecs in the outgoing feed | Use a supported codec and test the resulting stream in Live Control Room. |
| Bitrate is too low or incoming video is insufficient | Output bitrate, host CPU and memory pressure, outbound capacity, and whether the input is advancing | Restore the intended output rate, reduce encoding load or select a profile the host can sustain, and check stream health again. |
| Frame-rate or keyframe warning | Actual output frame rate and GOP interval | Match the chosen frame rate and keep keyframes at the recommended two-second interval, never over four seconds. |
| SSL connection error | Whether the URL is the current RTMPS URL and whether its server address is correct | Copy the details again from Live Control Room. YouTube’s SSL guidance suggests port 443 if the SSL error persists. |
| Feed stops at a file boundary or remains alive without new content | Whether the input reached EOF, the source is advancing, and the intended loop or playlist behavior | Choose and test a repeat or playlist workflow appropriate to the media; a process restart alone may not provide the intended content sequence. |
| Logs or media exhaust disk space | Free disk space and log growth | Set up a retention approach and verify that needed logs remain available without allowing them to fill the volume. |
| Encoder is online but broadcast is not as intended | Broadcast schedule and state in Live Control Room | Correct the YouTube broadcast lifecycle separately; systemd manages the encoder process, not channel settings. |
Useful routine checks include service state and restart count, recent logs, output bitrate, CPU and memory pressure, disk space, input progress, YouTube preview and health messages, and broadcast state. For RTMPS or other transport details, consult the Debian trixie FFmpeg protocol manpage as applicable to that release; options may differ with the installed FFmpeg version.
Estimate bandwidth and recurring transfer
Size the VPS around the chosen bitrate and verify its transfer policy. As an arithmetic estimate, a steady 5 Mbps video payload is about 2.25 GB per hour before audio and protocol overhead; at 24 hours a day for 30 days, that is roughly 1.62 TB before overhead. This assumes the stream actually runs continuously at that rate. It is not a provider allowance or a measurement of a particular VPS.
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