For OBS, use a supported YouTube ingest setup, set the encoder to constant bitrate (CBR), choose a bitrate matched to your codec, resolution, and frame rate, and set the keyframe interval to 2 seconds. Then select Ultra low-latency separately in YouTube’s broadcast settings: OBS encoder settings do not switch YouTube’s latency mode. YouTube’s H.264 recommendations include 14 Mbps for 1080p30 and 17 Mbps for 1080p60. Ultra-low latency does not support captions or resolutions above 1080p.
Set the OBS encoder for YouTube Live
In OBS, open the streaming encoder controls under Settings → Output (the exact fields and available encoders can vary by OBS version and hardware). Choose a codec and ingest setup supported by YouTube, then configure rate control, bitrate, and keyframes for the output you intend to send.
- Configure the YouTube service and ingest protocol. Use OBS’s YouTube service configuration and a protocol supported by your stream setup. For RTMP-based streaming, YouTube recommends RTMPS. YouTube lists H.264, H.265/HEVC, and AV1 as video codec options, and frame rates up to 60 fps. See YouTube’s encoder settings and recommendations.
- Set rate control to CBR. Constant bitrate is YouTube’s recommended rate-control setting.
- Set the keyframe interval to 2 seconds. YouTube recommends two seconds and says not to exceed four seconds.
- Choose a bitrate for your actual codec, resolution, and frame rate. The H.264 figures below are YouTube recommendations, not guarantees of picture quality, connection stability, or end-to-end latency.
| H.264 output | YouTube-recommended bitrate |
|---|---|
| 720p30 | 8 Mbps |
| 720p60 | 8 Mbps |
| 1080p30 | 14 Mbps |
| 1080p60 | 17 Mbps |
These examples are from YouTube’s H.264 recommended column. For other codecs or output formats, use the matching recommendation in YouTube’s current encoder guide rather than assuming the H.264 value applies.
Enable ultra-low latency in YouTube separately
Ultra-low latency is a YouTube broadcast setting, not an OBS encoder preset. After setting up the encoder, choose Ultra low-latency in the broadcast’s YouTube latency options. The YouTube Live Streaming API states that this mode does not support closed captions or resolutions higher than 1080p: YouTube Live Streaming API reference.
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YouTube’s encoder help also says 2160p (4K) streams cannot use the improve-for-low-latency option and are set to normal latency. Therefore, if 4K output matters, do not plan on ultra-low latency for that broadcast. See YouTube’s encoder guide.
Test the complete setup before going live
A correct encoder configuration does not guarantee a specific end-to-end delay. Before the event, test the stream with audio and movement resembling the planned broadcast, and check YouTube’s stream-health messages. YouTube advises choosing a quality that is reliable for the available upload connection and testing before starting; its guidance says tests should include representative audio and movement. YouTube Help: encoder settings and testing.
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- Confirm OBS is sending the intended resolution and frame rate, not just displaying those values in a profile.
- Check that the selected codec is available in your local encoder and supported by the chosen YouTube ingest configuration.
- Watch YouTube’s stream health during the test; if the connection cannot reliably sustain the selected output, choose a quality your upload connection can maintain.
- Verify that the YouTube broadcast itself is set to ultra-low latency; changing CBR, bitrate, or keyframes in OBS does not enable that mode.
- If captions or output above 1080p are required, ultra-low latency is not a fit for that broadcast.
Common setup problems
The stream is not ultra-low latency
Check the broadcast latency choice in YouTube. OBS’s bitrate and keyframe fields configure the outgoing contribution, not YouTube’s viewer-facing latency mode.
The stream has connection or quality problems
Check YouTube’s stream-health messages and whether your upload connection can sustain the chosen bitrate and output. Retest at a quality that is reliable for the available connection; YouTube’s recommendations are not a guarantee for every network.
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The ultra-low-latency option conflicts with the intended output
Ultra-low latency does not support captions or resolutions above 1080p. YouTube says 2160p uses normal latency rather than the improve-for-low-latency setting.
OBS does not show the same encoder controls
Available choices and labels depend on OBS version and hardware. Locate the rate-control, video-bitrate, and keyframe-interval controls in the streaming encoder settings; do not treat a vendor-specific preset as a universal YouTube requirement.
Rank #4
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Or let it run in the cloud
For a YouTube channel built around uploaded recordings rather than a live camera or gameplay session, StreamNeo can keep a stream running from the cloud: upload a video or build a playlist, add your YouTube stream key, and go live. Nothing has to stay on at home. It streams uploads as made, up to 4K 60fps, at one price per slot; it can automatically recover if YouTube drops the stream. The first day is free with no card. Monthly: $9.99 per month. StreamNeo is for YouTube and plays uploaded videos; it is not a substitute for OBS when you need to send live camera or gameplay footage. Learn more at StreamNeo, or start the free day.
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Best Value
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