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For YouTube Live, set Streamlabs Desktop’s streaming encoder Keyframe Interval to 2 seconds when the control is available. YouTube recommends two seconds and says not to exceed four; two seconds is the preferred setting, not merely one acceptable choice. [YouTube encoder settings]
Where to find Keyframe Interval in Streamlabs Desktop
- Open Streamlabs Desktop and select Settings → Output.
- Locate the streaming encoder controls for the active output mode and encoder.
- Set Keyframe Interval to 2 seconds, if the control is available, then apply or save the setting.
Streamlabs’ support guide identifies Output as the area for encoder configuration and gives two-second keyframe examples. The exact subpanel can depend on the selected encoder and output mode, so there is not one guaranteed click path for every setup. [Streamlabs Desktop setup guide]
What the keyframe interval means
The interval is the time between keyframes in the video sent by your encoder. It is separate from bitrate, resolution, and frame rate: changing the interval does not set those other properties.
The interval also corresponds to a number of frames based on frame rate. At 30 fps, a two-second interval means a keyframe every 60 frames. [YouTube live-stream error guidance]
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YouTube’s keyframe guidance for RTMP/RTMPS
YouTube’s encoder-settings table for RTMP/RTMPS recommends a two-second keyframe frequency and sets a maximum of four seconds. It also specifies CBR bitrate encoding and supports H.264, H.265/HEVC, and AV1 video codecs, with frame rates up to 60 fps. These details apply to the RTMP/RTMPS table; do not assume they are specifications for a different streaming protocol. [YouTube encoder settings]
The four-second value is a ceiling, not the recommended target. Use two seconds for YouTube Live rather than treating two and four seconds as equally preferred options.
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Fix an “incorrect video keyframe frequency” warning
- Check the active streaming encoder’s Keyframe Interval in Streamlabs Desktop and set it to two seconds.
- Check the encoder’s GOP configuration if available. YouTube says its processing pipeline requires a closed GOP for optimal transcoding. [YouTube live-stream error guidance]
- Run a test stream and inspect YouTube’s stream health rather than assuming the saved setting guarantees successful ingestion. YouTube recommends testing before going live and monitoring stream health. [YouTube encoder settings]
YouTube’s error guidance instructs creators to change the encoder so keyframes are sent every two seconds; it warns that a frequency longer than four seconds can cause buffering. [YouTube live-stream error guidance]
Or let it run in the cloud
If your goal is to keep uploaded videos playing as a YouTube livestream around the clock, StreamNeo is a cloud option rather than a Streamlabs Desktop configuration. Upload a recording or build a playlist, add your YouTube stream key once, and go live. Your computer and home internet connection do not need to stay on.
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See StreamNeo for details, or start your free day.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Start a YouTube livestream from an encoder
If you still need to create or configure the YouTube broadcast, YouTube’s encoder walkthrough covers creating a live stream and connecting an encoder. Follow YouTube’s setup flow, then confirm the encoder’s keyframe interval and test stream health before relying on the broadcast. [Create a YouTube live stream with an encoder]
Quick Recap
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