To send a MediaMTX stream to YouTube Live, configure an outbound forward for the MediaMTX path carrying your source and use YouTube’s RTMPS destination with the current stream key from YouTube Live Control Room. This is separate from MediaMTX’s inbound RTMP listener: listener settings control where a client publishes into MediaMTX; forwarding sends that stream from MediaMTX to YouTube.
Understand the two connections
A typical setup has two separate links:
- Source to MediaMTX: An encoder or client such as FFmpeg or OBS publishes to a MediaMTX path.
- MediaMTX to YouTube: MediaMTX forwards that path to YouTube’s ingest endpoint using the channel’s stream key.
Settings such as rtmpAddress and rtmpsAddress configure MediaMTX’s inbound server listeners. They do not set the outbound YouTube destination. The configuration reference also lists rtmp, rtmpEncryption, rtmpServerKey, and rtmpServerCert as server-side RTMP options. See the MediaMTX configuration file reference and its forwarding documentation.
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Configure MediaMTX to forward a path to YouTube
1. Get the current YouTube ingest details
In YouTube Studio, open Live Control Room for the channel or event and copy its current stream key and ingest details. Treat the key like a password: do not publish it, place it in a public example, or reuse a sample value. YouTube recommends RTMPS, the encrypted extension of RTMP. Its documented destination format for MediaMTX is rtmps://a.rtmp.youtube.com/live2#<YOUR_STREAM_KEY>. Replace the placeholder with your current key; do not include the angle brackets.
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YouTube’s API documentation also describes live stream ingestion details in its LiveStreams reference. Use the details shown for your own channel or event rather than assuming a key or endpoint from an old setup is still current.
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2. Identify the MediaMTX path carrying your source
Determine the path to which your encoder publishes. The outbound forward must be configured for that path. MediaMTX’s RTMP client publication examples cover publishing into the server; its documentation also includes OBS examples. The client’s destination into MediaMTX and MediaMTX’s destination to YouTube are not interchangeable.
3. Add the outbound destination for that path
Edit mediamtx.yml and follow MediaMTX’s official Forward streams example for the installed release. Set the forward destination to rtmps://a.rtmp.youtube.com/live2#<YOUR_STREAM_KEY> on the path receiving your source. The exact path configuration depends on your local setup and MediaMTX version, so adapt the documented example rather than copying a configuration for a different release.
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Keep the stream key private. If the configuration file is accessible to other users or included in a repository, protect it accordingly; never use a real key in screenshots or published configuration examples.
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MediaMTX documents configuration through file edits, environment-variable overrides, and the Control API, as well as a configuration validation command and hot reloading in supported situations. Check the configuration documentation for the command and reload behavior that match your installed version. The online reference follows the latest release; syntax may differ from an older installation.
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5. Start the source and confirm the forward
Publish the source to the intended MediaMTX path, then check that forwarding reaches YouTube. Open Live Control Room and watch stream health and any messages during a representative test. MediaMTX forwarding relays a stream; do not assume it transcodes a source that does not meet YouTube’s format or timing requirements.
Check the source against YouTube’s encoder guidance
These are YouTube’s current Help Center recommendations for RTMP/RTMPS encoder settings, accessed in 2026; they are not guarantees of quality. Choose the target resolution and frame rate first, then check YouTube’s full table for the selected codec and available upload bandwidth. YouTube recommends CBR and a two-second keyframe interval, which should not exceed four seconds. Video codecs listed for RTMP/RTMPS are H.264, H.265/HEVC, and AV1, up to 60 fps. Audio may use AAC or MP3; AAC is required for 5.1 surround over RTMP/RTMPS. See YouTube’s encoder settings, bitrates and resolutions guidance.
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| Video mode | Codec | YouTube-recommended bitrate |
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| 1080p at 60 fps | H.264 | 17 Mbps |
| 1080p at 30 fps | H.264 | 14 Mbps |
| 720p at 60 fps | H.264 | 8 Mbps |
| 720p at 30 fps | H.264 | 8 Mbps |
These figures are YouTube recommendations, not independent test results or proof that a particular connection can sustain the stream. Test with representative motion and audio, leave sufficient upload capacity, and monitor stream health and event messages. The encoder table may include additional combinations and details beyond the examples above.
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- YouTube receives nothing: Confirm the source is publishing to the path you configured for forwarding, and that MediaMTX is running with the updated configuration.
- The source reaches MediaMTX but not YouTube: Check that the outbound destination uses RTMPS and the current stream key from Live Control Room. A listener address such as
rtmpAddressis not the outbound forwarding destination. - YouTube reports an encoder or stream-health warning: Check the source codec, resolution, frame rate, bitrate, CBR setting, keyframe interval, and audio format against YouTube’s current guidance. Forwarding does not itself correct an incompatible source.
- The configuration fails validation or does not reload: Check syntax against documentation for your installed MediaMTX release and use its documented validation and reload methods.
- A previously working key stops working: Retrieve the current key and ingest details from Live Control Room, update the outbound destination, and keep the replacement key private.
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- ⭐【Highly Customizable Settings to Meet Individual Needs】- It supports adding static text, scrolling captions, brand logos, and timestamps. Users can freely adjust core parameters such as video resolution, frame rate, and bitrate, and also perform personalized editing functions such as video cropping, rotation, flipping, and mirroring. It supports dual input of HDMI embedded audio and line-in audio, with adjustable sound quality, making your live stream content more distinctive and allowing you to create a unique brand live stream style.
- ⭐【Stable and Efficient Transmission, Easy Operation】- Employing HDMI to Ethernet core connection technology, it ensures stable and reliable network transmission with low latency and no lag, adapting to various network environments. Equipped with an intuitive user interface and detailed instruction manual, no professional technical background is required; setup can be completed quickly after connecting the device. It is also compatible with multiple terminals such as computers and mobile phones for management, and the video stream status can be viewed in real time via a URL.
- ⭐【Lifetime Free Warranty and Technical Supports】- All URayCoder video codecs come with a lifetime free warranty and technical supports, supporting secondary development and feature customization to meet enterprise-level personalized needs. Meanwhile, we providing many kinds of customization services such as shell pattern printing, logo addition, hardware and function development, ensuring reliable quality and worry-free after-sales service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
