The Tool Desk
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Set the OBS streaming keyframe interval to 2 seconds
- In OBS, open Settings, then Output.
- Set Output Mode to Advanced if the streaming encoder controls are not visible.
- Open the Streaming tab and find Keyframe Interval in the encoder settings.
- Enter 2 seconds, then apply the change. Confirm you changed the streaming encoder, not the separate recording encoder.
OBS labels and available controls can vary by version and encoder. If your control takes a frame count rather than seconds, use the outgoing frame rate: at 30 fps, two seconds is 60 frames; at 60 fps, it is 120 frames. OBS documents additional NVENC options, including frame-based keyint controls, for OBS 31.0 and later; prefer the standard Keyframe Interval control when available rather than applying a custom option that may not match your version.
Why YouTube recommends two seconds
YouTube Help’s live encoder settings recommend a keyframe frequency of two seconds and set a ceiling of four seconds. NVIDIA’s YouTube-specific OBS guidance also recommends a two-second interval. Together, they make two seconds the practical setting for an OBS NVENC stream sent to YouTube Live.
YouTube lists H.264, H.265/HEVC, and AV1 as accepted live video codecs, and its keyframe-frequency guidance appears in the encoder settings for live streams. The interval is independent of bitrate, resolution, and frame rate: it specifies how often keyframes occur, not how much data the stream sends or its picture dimensions.
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Check the rest of the streaming output separately
Keyframe interval is only one encoder setting. YouTube publishes separate live encoder guidance for bitrate and other settings, so changing the interval does not configure those automatically. NVIDIA’s guide also discusses CBR for YouTube streaming, but codec recommendations can depend on GPU generation; the keyframe setting itself does not require a particular codec choice beyond using an accepted YouTube codec.
Troubleshoot a missing or ineffective setting
- You cannot find Keyframe Interval: Check that Output Mode is Advanced and that you are looking under Streaming rather than Recording. OBS versions and encoder paths may expose different controls.
- Your field uses frames: Convert two seconds using the actual outgoing frame rate—60 frames at 30 fps or 120 at 60 fps. Do not use the recording frame rate if it differs from the stream.
- You changed the interval but YouTube still reports an issue: Verify the streaming encoder’s saved value and check other encoder settings, such as bitrate, separately. The keyframe interval does not set bitrate or resolution.
- You are considering a custom NVENC option: OBS’s additional NVENC options begin with version 31.0, and advanced labels or controls may differ across releases. Use the normal interval field when possible; do not assume one custom-option string applies to every OBS version and encoder.
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