To keep a YouTube live stream supplied by a looping video, run FFmpeg to publish the file to a MediaMTX path, then configure MediaMTX to forward that path to YouTube Live. Docker can keep MediaMTX’s configuration separate from its container, but this relay is only as dependable as the host, network, FFmpeg process, and YouTube connection. The setup below is a documented configuration pattern, not a tested deployment.
How the stream flows
The roles are separate: FFmpeg reads a source and publishes it; MediaMTX receives that feed on a path and forwards it to YouTube’s ingest endpoint.
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video or other source → FFmpeg → MediaMTX path → YouTube Live
MediaMTX describes itself as a live media server and proxy that can publish, read, proxy, record, and play back real-time media. It can keep a path available when a publisher is offline, but that capability does not guarantee that a YouTube broadcast survives a host, network, container, or account failure. MediaMTX project documentation
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Prepare Docker and MediaMTX
Choose the host and network
Run the containers on a machine that can remain on and reach the internet. FFmpeg must be able to reach MediaMTX on the selected publishing protocol’s listener port. If FFmpeg runs in another container, use the MediaMTX service name on a shared Docker network rather than assuming localhost refers to the MediaMTX container.
The MediaMTX Docker guide’s sample publishes several protocol ports, including RTSP 8554 and RTMP 1935. Publish only the listener ports your design uses; avoid exposing unrelated services. MediaMTX Docker documentation
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Keep configuration on the host
MediaMTX documents mounting a host directory containing mediamtx.yml into the container and using that directory as the working directory. This lets you maintain the YAML outside the container. It also documents configuration through MTX_-prefixed environment variables and through the Control API; choose a method that fits how you manage configuration and credentials.
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Configure the YouTube destination
- Open YouTube Live’s Go Live interface. Retrieve the current Stream URL and stream key shown for your broadcast. Do not assume an endpoint copied from an older example is still current.
- Configure a MediaMTX path to forward to YouTube. The MediaMTX forwarding guide shows the destination written as the URL, a
#, and the stream key. Its example isrtmps://a.rtmp.youtube.com/live2#streamKey; the guide warns that the endpoint reflects what YouTube reported when that documentation was updated. Use the URL YouTube currently displays for your channel instead. - Prefer RTMPS and verify certificate behavior. The guide recommends replacing
rtmp://withrtmps://for encryption in transit. It also notes that its example certificate was invalid at the last check and provides adestFingerprintworkaround. That fingerprint is volatile: verify the current certificate and endpoint before configuring any fingerprint rather than copying the sample as a permanent value. MediaMTX guide to forwarding to YouTube - Protect the key. Treat the stream key as a publishing credential. Keep it out of public examples, screenshots, and version control, and restrict access to the configuration or environment where it is stored.
MediaMTX supports environment overrides and the Control API as alternatives to a mounted YAML file. Those can change how configuration is maintained, but do not make a stream key safe to expose publicly.
Validate and start the container
Use the project’s Docker guide for the current image and mount syntax; the key idea is to mount the host configuration directory and start MediaMTX with that configuration. Before running the service, validate the configuration using the documented --validate-conf option. MediaMTX says configuration changes can be hot-reloaded without disconnecting existing clients whenever possible, but validation before startup is still useful for catching mistakes.
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When defining the forwarding path, make sure its name and protocol agree with the URL to which FFmpeg will publish. The listener port must be reachable from the FFmpeg process, whether both programs run in one container, separate containers, or separate machines.
Publish a looping file with FFmpeg
MediaMTX recommends RTSP for FFmpeg publishing and documents this looped-file pattern:
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ffmpeg -re -stream_loop -1 -i file.mp4 -c copy -f rtsp rtsp://localhost:8554/mystream
Replace file.mp4 with the media path available to the FFmpeg process. Replace localhost with the correct host or Docker service name if FFmpeg is not running alongside the RTSP listener, and use the path configured for forwarding instead of mystream if it differs. The -re option reads at real-time pace; -stream_loop -1 repeats the input indefinitely. -c copy avoids transcoding, but only use it if the source’s codecs and tracks are suitable for the destination. MediaMTX also documents RTMP publishing with -f flv to port 1935; it lists SRT, WebRTC, MPEG-TS, and RTP as other supported publishing options. The documentation does not establish a universal latency or quality winner among them. MediaMTX FFmpeg publishing documentation
Check tracks, preview, and operation
- Confirm both audio and video are present. MediaMTX’s YouTube forwarding guide warns that YouTube requires both tracks and silently rejects video-only streams. Check the source before relying on stream copy; if needed, configure FFmpeg to provide a valid audio track.
- Check YouTube’s live preview and status. A successful FFmpeg publish to MediaMTX does not alone prove that YouTube is receiving or accepting the forwarded stream.
- Watch MediaMTX logs and metrics. MediaMTX supports logging and metrics, which can help distinguish an incoming-publisher problem from a forwarding problem. No uptime guarantee or end-to-end monitoring procedure is established by the documentation cited here.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| FFmpeg cannot connect to MediaMTX | Wrong address, path, port, or Docker network; listener port not exposed or reachable. | Check the RTSP or RTMP URL, confirm FFmpeg uses the configured path, and verify that the relevant listener port is reachable from its container or host. |
| MediaMTX receives the feed but YouTube does not go live | Stale Stream URL or key, forwarding configuration error, or endpoint/certificate issue. | Copy the current Stream URL and key from YouTube Live. Check MediaMTX logs and verify current RTMPS endpoint and certificate behavior rather than relying on an old sample fingerprint. |
| YouTube rejects or does not show the stream | Missing audio or video track, or media encoding incompatible with the destination. | Confirm both tracks reach the forwarding path. Check source codecs and tracks before using -c copy; the cited examples do not establish codec suitability for every file. |
| The stream stops when the source ends | FFmpeg is not looping the input, or the input cannot be reopened. | For a file intended to repeat, confirm -stream_loop -1 is placed before the input option and that FFmpeg can read the file continuously. |
| Configuration edits do not take effect | Wrong mounted file or directory, invalid YAML, or a change that did not reload. | Check the host-to-container mount and working directory, run --validate-conf, and inspect logs. Hot reload is supported where possible, not guaranteed for every change. |
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