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Set OBS’s streaming Keyframe Interval to 2 seconds when sending an NVENC stream to YouTube Live. YouTube recommends a 2-second keyframe frequency and says not to exceed 4 seconds. This is a streaming-output setting; changing the recording encoder’s interval does not configure YouTube ingest. YouTube’s live encoder settings and NVIDIA’s OBS streaming guide support the 2-second target.

Set the streaming keyframe interval to 2 seconds

In OBS, open Settings, choose Output, and use Advanced for Output Mode if the streaming encoder controls are not visible. In the Streaming section, set Keyframe Interval to 2 s (or enter 2 if the field is expressed in seconds). Apply the change and confirm that you are editing the streaming encoder, not the separate recording encoder.

OBS labels can vary by version and encoder. OBS’s NVENC reference describes additional advanced options introduced with OBS 31.0; use the normal Keyframe Interval control when available rather than copying a custom option string that may not match your version or encoder. See the OBS Advanced NVENC Options reference.

Convert two seconds to frames if needed

Some advanced controls express the interval as a frame count. Multiply the outgoing frame rate by two to represent the recommended two-second interval:

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Outgoing frame rate Two-second interval
30 fps 60 frames
60 fps 120 frames

Use the actual frame rate of the outgoing stream. A keyframe interval determines how often keyframes occur; it does not set bitrate, resolution, or frame rate. YouTube publishes separate guidance for those settings.

Why YouTube recommends two seconds

YouTube Help’s encoder settings table says: “Recommended 2 seconds Do not exceed 4 seconds.” That is the live-platform target for the outgoing stream, including when you use NVENC. YouTube lists H.264, H.265/HEVC, and AV1 as accepted live video codecs; the keyframe-frequency recommendation is separate from the codec choice. NVIDIA’s YouTube-specific OBS guidance also recommends a two-second interval. OBS’s 2023 advanced recording guide lists 2 as an NVENC recording baseline, but recording guidance is corroboration, not the primary authority for live ingest.

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Check the other streaming settings separately

Do not use the keyframe interval to compensate for a bitrate or resolution issue. YouTube lists CBR as its live bitrate encoding mode and provides separate recommendations for bitrate and other encoder settings on its live encoder settings page. Choose those values for the resolution, frame rate, and codec you actually stream.

Troubleshoot a keyframe interval problem

  • The stream still reports an encoder or ingest warning: Verify that the value is 2 seconds in the Streaming section, then check bitrate mode and the other live settings independently against YouTube’s guidance.
  • You changed the value but the live stream did not: Check whether you edited Recording instead of Streaming. OBS maintains distinct output controls for each.
  • The control asks for frames: Convert using the actual outgoing frame rate: 60 frames at 30 fps or 120 frames at 60 fps for a two-second interval.
  • Your OBS screen has different advanced labels: Controls vary across releases and encoders. Prefer the standard interval field where present; OBS’s additional NVENC options documentation applies to version 31.0 and later.
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