The Tool Desk
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Get the correct YouTube ingest addresses
YouTube supplies ingest details for each stream. In the LiveStreams API resource, cdn.ingestionInfo.ingestionAddress is the primary address and cdn.ingestionInfo.backupIngestionAddress is the backup. For RTMPS, use the separate rtmpsIngestionAddress and rtmpsBackupIngestionAddress fields. The resource also supplies streamName; use the values for your own stream, not generic example endpoints. See YouTube’s LiveStreams resource documentation.
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YouTube may ask for the server URL and stream name in separate fields, or for a combined destination in the form STREAM_URL/STREAM_NAME. For FFmpeg, each tee destination needs the appropriate URL and stream name. Keep the key private: YouTube treats stream keys like passwords. See YouTube’s live stream settings guidance.
Send both destinations with FFmpeg tee
The tee muxer encodes once and distributes the output to multiple destinations. Because tee does not select streams for you, map the video and audio explicitly. This schematic command uses RTMP; replace every placeholder with the current full destination supplied by YouTube, including the stream name as required by the endpoint:
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ffmpeg -re -i INPUT
-map 0:v -map 0:a
-c:v libx264 -c:a aac
-f tee
'[f=flv]PRIMARY_URL|[f=flv]BACKUP_URL'INPUTis your input file or source.-rereads file input at its native rate rather than as fast as possible.-map 0:v -map 0:aselects the input’s video and audio tracks. If the input lacks audio, remove-map 0:a; if it has multiple tracks, map the specific streams you intend to send.-c:v libx264 -c:a aacencodes video and audio in commonly supported formats. Confirm that your FFmpeg build includes these encoders.-f teeselects the tee muxer, and[f=flv]sets the container format for each RTMP destination.
This is an adaptable example, not a live-channel-tested command. FFmpeg tee separates outputs with | and allows per-output options in square brackets. Shell quoting, URL characters, available encoders, and muxer support can vary with your operating system and FFmpeg build; consult the FFmpeg tee muxer documentation and validate the command with your installed version.
Choose what happens if one destination fails
By default, tee uses onfail=abort: an output failure can stop the whole process. If you want FFmpeg to continue sending to the other destination when one fails, set onfail=ignore on the relevant tee output, for example:
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-f tee '[f=flv:onfail=ignore]PRIMARY_URL|[f=flv:onfail=ignore]BACKUP_URL'Ignoring a failed output changes FFmpeg’s process behavior; it does not repair the failed destination or establish YouTube viewer-side failover. FFmpeg’s FIFO muxer can isolate outputs with different latency or reliability and provide recovery options, but it likewise does not guarantee that viewers will see an uninterrupted stream. Review the FFmpeg FIFO muxer documentation before adding it.
Use RTMPS when appropriate
Use protocol-specific addresses: do not turn an RTMP address into RTMPS merely by changing its scheme. Obtain YouTube’s RTMPS primary and backup values and use those as the tee destinations. YouTube describes RTMPS as RTMP tunneled through SSL and recommends it for ordinary user content. RTMPS requires a valid endpoint and path, port 443, and the server hostname in the TLS SNI handshake. Your FFmpeg build and network must support that connection. Details are in YouTube’s RTMPS ingestion guide.
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Set encoder parameters and protect the key
YouTube’s general encoder guidance lists H.264 video, AAC or MP3 audio, constant bitrate, and a recommended two-second keyframe interval that should not exceed four seconds. Choose bitrate and resolution for the actual feed and available upload bandwidth; there is no single bitrate that fits every stream. Check YouTube’s current encoder settings when configuring your output.
Do not share a real stream key in a command transcript, screenshot, or tutorial. If a key is exposed, replace it in YouTube’s stream settings and update the encoder destination accordingly.
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Test both ingest paths before relying on them
- Start FFmpeg with the primary and backup destinations configured, then open the event’s preview in YouTube Live Control Room.
- Check that the stream is arriving and that the expected video and audio appear. Resolve any encoder, key, URL, or network errors before going live to viewers.
- Test the event’s intended behavior by stopping the primary encoder and observing what happens in Live Control Room and to the viewer-facing stream. YouTube recommends previewing and testing backup encoder failover; apply an end-to-end test to your specific dual-ingest setup rather than assuming the second connection guarantees a seamless transition. See YouTube’s streaming tips.
Common problems and fixes
- FFmpeg reports that no streams are selected: tee cannot infer the tracks. Add explicit
-mapoptions and adjust them to match the input’s actual audio and video streams. - One output fails and FFmpeg exits: tee defaults to aborting on a slave-output failure. Decide whether continuing with one destination is preferable, then configure
onfail=ignoreintentionally and monitor the remaining output. - The destination is rejected: check that you copied the primary and backup addresses for this stream and paired them with its stream name as required. Do not substitute a generic URL or reuse an address from another stream.
- RTMPS does not connect: use the RTMPS-specific YouTube addresses, not an RTMP URL with a changed scheme. Check outbound access to port 443 and whether the FFmpeg TLS connection sends the required server hostname through SNI.
- The picture or sound is missing: inspect the input streams and the maps, then confirm the selected encoders are available in your FFmpeg build. Check the preview in Live Control Room.
- The backup receives data but viewers still see an interruption: dual delivery alone does not prove seamless viewer-side failover. Test the actual event behavior and do not treat FFmpeg’s output-failure options as YouTube failover controls.
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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.
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