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Use a 2-second keyframe interval for a YouTube live stream. If your encoder asks for a frame count instead of seconds, set it to your output frame rate multiplied by two: 60 frames at 30 fps or 120 frames at 60 fps. YouTube says not to exceed 4 seconds; that is the maximum stated interval, not the recommended target.
Set the interval to two seconds
In your encoder, look for a setting called keyframe interval, keyframe frequency, or keyframe distance. Enter 2 seconds if the setting accepts time. YouTube’s live encoder settings recommend a 2-second frequency and say not to exceed 4 seconds.
A keyframe interval can also be expressed as a number of frames. Multiply the stream’s selected output frame rate by two:
| Output frame rate | Frame count for a 2-second interval |
|---|---|
| 24 fps | 48 frames |
| 30 fps | 60 frames |
| 60 fps | 120 frames |
The 30 fps conversion is given in YouTube’s live streaming error guidance; the 24 fps and 60 fps figures are arithmetic conversions of the same two-second interval. Use the frame rate you actually selected for the stream, not a source file’s frame rate if they differ.
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Fix an incorrect keyframe-frequency warning
- Check the output frame rate selected in your encoder.
- Set the keyframe interval to two seconds, or set the frame count to twice the output frame rate. For example, at 30 fps, use 60 frames.
- Confirm the setting has been applied to the stream’s output configuration, then check YouTube’s stream health and error messages.
YouTube’s troubleshooting guidance says to change the setting so keyframes are sent every two seconds and to use a frequency of four seconds or less. If your encoder accepts only frames and the dashboard still reports a mismatch, recheck that the frame count corresponds to the stream’s current output frame rate.
Test before the event and monitor the stream
Before going live, test the stream with audio and video movement similar to the planned event. While live, keep an eye on YouTube’s stream health and any error messages so you can catch configuration problems early. YouTube’s encoder guidance also lists RTMP/RTMPS, H.264, H.265 (HEVC), and AV1, frame rates up to 60 fps, and CBR bitrate encoding; those broader encoder settings do not change the two-second keyframe recommendation.
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