A running FFmpeg process does not prove that YouTube is receiving a usable live stream. FFmpeg may be publishing to the wrong place or path, MediaMTX may not be forwarding that path, YouTube may be rejecting the destination or stream key, or the outgoing feed may be missing audio. Check each boundary in order: FFmpeg destination, MediaMTX path and publisher, YouTube forwarding settings, audio and video tracks, then connection errors and YouTube Live Control Room status.
First, identify where FFmpeg sends its output
There are two separate links to check: FFmpeg can publish to MediaMTX, and MediaMTX can then forward that stream to YouTube. Some FFmpeg commands instead send output directly to YouTube. Do not change the forwarding configuration until you know which arrangement your command uses.
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- Read the entire FFmpeg command, especially its final output URL and format. The MediaMTX FFmpeg documentation shows an RTMP publishing example ending with
-f flv rtmp://localhost:1935/mystream. In that example, FFmpeg publishes to the MediaMTX host on themystreampath. Confirm that your command uses the intended MediaMTX host, protocol and path. See MediaMTX’s FFmpeg publishing guide. - Check whether FFmpeg targets MediaMTX or YouTube directly. If its output URL points to YouTube, MediaMTX forwarding settings are not the link carrying that output. If it points to MediaMTX, continue by checking whether MediaMTX receives and forwards the corresponding path.
- Compare the output path with the configured MediaMTX path. A publisher connected to a different path will not provide the stream expected by a forwarding rule attached elsewhere.
The specific FFmpeg command and configuration are not available here, so the process alone cannot identify which of these cases applies.
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Check MediaMTX’s publisher and path state
Use MediaMTX’s logs to find the boundary where the stream stops. Look around the time of the attempt for configuration loading, publisher connections, path activity, disconnects and forwarding errors. MediaMTX supports error, warn, info and debug log levels, with output to stdout, a file or syslog; check your configured destination before concluding that no relevant event was recorded. The configuration reference describes these options.
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- Confirm that MediaMTX loaded the configuration you intended and that the relevant path exists.
- Look for evidence that FFmpeg connected as a publisher to that exact path, then check for a disconnect or error.
- If the current log detail is insufficient, temporarily raise
logLeveltodebugand retry. Correlate the new publisher and forwarding events with the time of the attempt. - After editing the configuration, validate it with MediaMTX’s documented
--validate-confoption before relying on the changed settings.
Logs can show what MediaMTX reports, but without your configuration and log output they cannot establish the particular cause.
Verify the YouTube forwarding URL and stream key
If MediaMTX is supposed to send the path to YouTube, check the forwarding destination attached to that path and the stream key. MediaMTX’s YouTube forwarding guide shows the ingest URL and stream key separated by #. Its example hostname is not a guarantee that the same endpoint is current for your channel: use the ingest address and key shown in YouTube Live Control Room now.
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- In YouTube Live Control Room, copy the current stream URL and stream key for the intended broadcast.
- Compare them with the destination configured for the active MediaMTX path. Check for an outdated URL, a key copied from another stream, or a mismatch between the path FFmpeg publishes to and the path MediaMTX forwards.
- Consider the guide’s recommendation to use the
rtmps://scheme for encryption in transit, where supported by the current destination and configuration.
YouTube’s help guidance also says to copy the stream key from Live Control Room into the encoder and documents RTMPS support: YouTube Help: stream with an encoder. Treat the account-provided URL and key as authoritative rather than relying on a generic example.
Confirm that the stream sent to YouTube has audio and video
A stream can be active at the process and path level yet fail YouTube’s media requirements. MediaMTX’s forwarding documentation states: “YouTube requires streams to have both a video and an audio track. Video-only streams are silently rejected.” Inspect the outgoing feed that MediaMTX forwards, not just whether FFmpeg remains running, and confirm both tracks are present.
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Use connection errors to narrow the failure
If MediaMTX reports a failed connection or timeout while forwarding, first recheck the current YouTube destination and stream key. Then investigate connectivity from the machine running MediaMTX. A timeout is evidence of a connection problem, not a complete diagnosis: YouTube Help advises checking the encoder documentation when a connection times out.
- Forwarding never appears in the logs: revisit whether the active path has the intended forwarding destination and whether FFmpeg publishes to that path.
- MediaMTX logs a forwarding connection failure or timeout: verify the current account-provided URL and key, then check network reachability from the MediaMTX host.
- YouTube still shows offline despite apparent forwarding: confirm both audio and video reach YouTube and inspect Live Control Room for the status or error it reports.
The available details do not establish a particular DNS, firewall, TLS, routing or account problem. Do not assume one without the relevant logs, deployment details or YouTube status.
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Version and endpoint details can change
The MediaMTX configuration reference identifies itself as the configuration for release v1.21.1. That describes the version represented by the page, not the version installed on your machine. Check your own installation when comparing settings. The MediaMTX YouTube guide also warns that its sample ingest hostname may have changed; stream keys are account-specific, so use the current values in Live Control Room.
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