For YouTube Live with NVIDIA NVENC using H.264 in OBS, set Rate Control to CBR, use a 2-second keyframe interval, and choose the bitrate YouTube recommends for your resolution and frame rate. For example, use 17 Mbps for 1080p60 or 14 Mbps for 1080p30. These are YouTube’s H.264 ingest recommendations—not an NVENC-specific table—and they only work if your upload connection can sustain them.
Recommended YouTube H.264 bitrates
Choose the row that matches the resolution and frame rate you actually send to YouTube. These values apply to H.264 ingestion; YouTube’s AV1 and H.265 recommendations use different tables. The figures below are YouTube Help’s recommended H.264 bitrates, not minimums. YouTube lists lower minimums separately. YouTube’s encoder settings and bitrate guidance
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| Ingest resolution | Frame rate | Recommended H.264 bitrate |
|---|---|---|
| 2160p (4K) | 60 fps | 50 Mbps |
| 2160p (4K) | 30 fps | 42 Mbps |
| 1440p | 60 fps | 34 Mbps |
| 1440p | 30 fps | 21 Mbps |
| 1080p | 60 fps | 17 Mbps |
| 1080p | 30 fps | 14 Mbps |
| 720p | 60 fps | 8 Mbps |
| 720p | 30 fps | 8 Mbps |
| 480p | 30 fps | 4 Mbps |
| 360p | 30 fps | 4 Mbps |
For instance, YouTube’s minimum for 1080p60 is 6 Mbps, while its recommended target is 17 Mbps; at 1440p60, the minimum is 8 Mbps and the recommendation is 34 Mbps. Treat the recommendation as a target only when your connection can reliably sustain it.
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Set up NVENC in OBS
In OBS, select NVIDIA NVENC H.264 as the streaming encoder if you are using the H.264 bitrate table above. OBS labels and available options can vary by version, but the essential YouTube-facing settings are rate control, bitrate, and keyframe interval.
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- Open the output settings: in OBS, go to Settings > Output. If Output Mode is set to Advanced, open the Streaming tab. Select NVIDIA NVENC H.264 as the encoder.
- Set rate control to CBR: YouTube’s encoder guidance calls for constant bitrate (CBR) for live ingestion.
- Enter the bitrate: use the recommended value in the table for your output resolution and frame rate. If the connection cannot reliably sustain it, lower the bitrate or choose a lower resolution or frame rate.
- Set the keyframe interval to 2 seconds: YouTube recommends two seconds and says not to exceed four seconds.
- Set the output resolution and frame rate: make them match the bitrate row you selected. YouTube’s listed encoder settings go up to 60 fps.
- Leave advanced encoder controls deliberate: keep suitable defaults for options such as preset, tuning, multipass, profile, and adaptive quantization unless you have a reason to change them. Their impact depends on OBS version, GPU, and workload.
YouTube’s advanced recommendations also include progressive scan, two B-frames, one reference frame, CABAC, square pixels, and Rec. 709 for SDR. Preserve relevant OBS defaults where exposed rather than applying low-level overrides without a specific need. YouTube recommends RTMPS for ingest.
Choose resolution and frame rate for your connection
Higher resolution and frame rate require a higher sustained ingest bitrate. At 1080p, moving from 30 to 60 fps changes YouTube’s recommended H.264 target from 14 to 17 Mbps. At 1440p, the change is from 21 to 34 Mbps. Choose the higher setting when your content benefits from the additional detail or smoother motion and your upload is reliable enough to support it.
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- Run an upload speed test before the event and assess whether the connection can reliably sustain the selected stream bitrate.
- Test with representative movement and audio before going live. YouTube specifically recommends including both in the test.
- Watch YouTube’s stream health indicators during the test and event. If the stream is unstable, reduce bitrate or step down resolution or frame rate.
- Do not assume a viewer receives your exact ingest bitrate. YouTube transcodes live streams into multiple output formats for viewers.
YouTube does not define a universal upload-headroom percentage in the cited encoder guidance. Avoid treating any particular extra margin as an official requirement.
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OBS sends the encoded video to YouTube using the stream key associated with your live stream. In YouTube’s live-control workflow, select or create a stream, copy its stream key, and enter it in OBS under Settings > Stream with YouTube as the service. Keep the key private: someone who obtains it may be able to send a stream to your channel. YouTube’s stream-management instructions cover stream keys and latency choices; latency does not change the H.264 bitrate recommendations. YouTube Help: Manage your live stream settings
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NVENC settings that are not one-size-fits-all
The bitrate table is determined by YouTube’s ingest format, not by a special NVENC bitrate formula. NVENC’s preset, tuning, multipass, profile, and adaptive-quantization controls affect encoding behavior, but no single preset is best for every GPU, OBS version, and workload.
OBS’s older NVENC guide dates to 2018, so its example preset choices should not be treated as universally optimal for current hardware. OBS’s advanced options documentation includes controls introduced in OBS 31.0, such as VBR with target quality and Ultra High Quality tuning; OBS notes that Ultra High Quality significantly reduces throughput and is not recommended for gaming. Choose these controls based on your encoder’s capacity and the workload rather than changing them to compensate for an incorrect bitrate target. OBS Project NVENC guide · OBS Project Advanced NVENC Options
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Troubleshoot bitrate and stream problems
OBS reports dropped frames or the connection is unstable
The upload connection may not be reliably sustaining the bitrate. Test upload speed, reduce bitrate, or lower resolution or frame rate. A high-quality target is not useful if the connection cannot deliver it consistently.
YouTube reports a bitrate or encoder issue
Confirm that the encoder is H.264 if you selected values from the H.264 table, that rate control is CBR, and that the bitrate matches the actual output resolution and frame rate. Check that the keyframe interval is two seconds and no more than four.
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The stream looks softer or less fluid than expected
Check the output resolution and frame rate in OBS and compare them with the row used to choose the bitrate. If the content has fast motion, a higher frame rate can help, but it also raises the recommended bitrate at some resolutions. YouTube transcodes the incoming stream, so viewers may receive a different output bitrate.
NVENC performance changes after adjusting advanced controls
Return to a known stable configuration and change one control at a time. Preset and tuning results depend on the GPU, OBS version, and workload; an older example is not a guarantee of the best choice for a current system.
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