The Tool Desk
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Before you configure OBS: check the GPU, driver, and Ubuntu version
NVENC is NVIDIA’s hardware video encoder. OBS supports NVENC on Linux, but the presence of an NVIDIA GPU alone does not prove that the installed driver and OBS build expose the encoder or the codec you want. OBS’s general Linux guidance names GeForce 750 Ti, Maxwell 900-series, or newer as hardware guidance; that does not guarantee every codec or 4K60 workload on every card. OBS’s NVENC guide is a useful starting point.
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- Identify your exact GPU and Ubuntu release before following installation instructions.
- Use Ubuntu’s supported driver guidance and installation tooling rather than an unsupported driver branch. Ubuntu notes that an obsolete branch request may move to a supported branch. See Ubuntu’s NVIDIA driver installation documentation.
- Install OBS using a method currently documented for your Ubuntu release. OBS documents its official PPA for Ubuntu 24.04 and newer and also offers Flatpak; for other releases, follow the current OBS download page.
- Check the release notes for your installed OBS version and your GPU’s encoder capabilities. For example, OBS 31.0.4 release notes say NVIDIA Kepler 600/700-series GPUs are no longer supported for NVENC and note that NVIDIA Linux users may need driver 550.54.14 or newer for that release. This is specific to OBS 31.0.4, not a universal minimum. See the OBS 31.0.4 release notes.
After installing or changing a driver, restart if prompted. Open OBS and check whether an NVIDIA NVENC encoder is available in the streaming output options. If it is missing, resolve the driver, package, or compatibility issue before configuring the stream.
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YouTube’s current encoder recommendations distinguish 4K/2160p at 60 fps by video codec. These are platform ingest recommendations, not guarantees of image quality for each viewer or proof that a particular connection can sustain the stream. YouTube’s page was inspected on October 3, 2026. See YouTube’s live encoder settings, bitrates, and resolutions.
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| Codec sent to YouTube | YouTube recommended bitrate for 4K/2160p60 | Listed minimum | Practical note |
|---|---|---|---|
| H.264 | 50 Mbps | 14 Mbps | Use only if the GPU and OBS build offer reliable H.264 NVENC encoding at the target workload. |
| AV1 | 35 Mbps | 10 Mbps | Availability depends on the GPU, driver, and OBS build. YouTube does not support AV1 for HDR. |
| H.265 (HEVC) | 35 Mbps | 10 Mbps | YouTube recommends H.265 for HDR; confirm your encoder and OBS support it. |
The minimum figures are a floor, not the recommended target. Choose a codec your specific hardware actually supports; do not select AV1 or H.265 merely because the listed rate is lower. If the machine cannot encode the chosen format consistently or the connection cannot carry its recommended bitrate, step down the resolution or frame rate instead of calling the result 4K60.
If 4K60 is not sustainable
YouTube’s same recommendations list 34 Mbps H.264 or 24 Mbps AV1/H.265 for 1440p60, and 17 Mbps H.264 or 12 Mbps AV1/H.265 for 1080p60. These are also ingest recommendations. A lower, stable output is preferable to repeated interruptions or a stream that misses its intended frame rate.
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Set the OBS video and streaming output
- Open the output settings. In OBS, go to Settings → Output. If Output Mode is set to Simple, change it to Advanced so the streaming encoder controls are visible. Select the streaming output section.
- Select NVENC and the compatible codec. Choose the NVIDIA NVENC encoder exposed by your installation and select an ingest codec supported by that GPU, driver, OBS version, and YouTube. The exact codec labels and available controls can vary by OBS build and hardware.
- Set rate control to CBR. YouTube’s guidance specifies constant bitrate. Enter 50,000 Kbps for H.264 or 35,000 Kbps for AV1/H.265 at 4K60, based on YouTube’s recommendations inspected October 3, 2026. Do not confuse these recommendations with the lower listed minimums.
- Set the keyframe interval to two seconds. YouTube recommends 2 seconds and says not to exceed 4 seconds. OBS’s NVENC guide also recommends CBR and a 2-second keyframe interval; use current YouTube guidance where older encoder-guide advice differs.
- Set the frame size and rate. In Settings → Video, set the base (canvas) resolution and output (scaled) resolution to 3840×2160 if your source and scene are designed for 4K, and set Common FPS Values to 60. If you intentionally scale a lower-resolution scene, the output can be 4K but does not gain detail that was absent from the source.
- Keep an SDR stream on the appropriate color settings. For SDR, YouTube lists Rec. 709, progressive scan, square pixels, 8-bit SDR, two B-frames, one reference frame, and CABAC among its advanced guidance. Use the relevant OBS controls when available and avoid enabling HDR unless the capture, color pipeline, and ingest codec are deliberately configured for it.
- Configure audio. YouTube lists AAC or MP3 audio, with 128 Kbps for stereo and 384 Kbps for 5.1. For 5.1 over RTMP/RTMPS, YouTube supports AAC only. Confirm the correct microphone, desktop, or program audio source in OBS and listen to a test recording or test stream.
YouTube’s guidance also lists a maximum of 60 fps. For HDR, it recommends H.265 at 10-bit and says AV1 is not supported for HDR. Those HDR requirements are different from a straightforward SDR configuration; do not treat an SDR Rec. 709 setup as HDR.
Connect OBS to your YouTube Live broadcast
- In YouTube Studio, open Create → Go live to reach the Live Control Room, then create or select the broadcast and its stream configuration.
- Copy the current stream URL and stream key shown for that configuration. YouTube recommends RTMPS for encrypted transfer to its servers. Follow the URL and protocol shown in the current Live Control Room rather than reusing an old key or guessing an endpoint.
- In OBS, open Settings → Stream, select the appropriate YouTube service or configure the server manually if needed, then enter the stream URL and key in the corresponding fields. Labels can vary by OBS version and connection method.
- Treat the stream key like a password. Do not include it in screenshots, recordings, public posts, or shared configuration files. If it is exposed, replace or reset it in YouTube Studio before broadcasting.
- Start streaming from OBS and check the Live Control Room for incoming video, audio, and stream health before making the broadcast public or beginning the event.
YouTube says 4K live streams use normal latency; its low-latency option is unavailable for 4K. YouTube transcodes the incoming live feed into multiple viewer formats, so the viewer’s playback resolution may differ from the 4K input.
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Test the stream and check YouTube’s health messages
YouTube explicitly advises: “Make sure to test before you start your live stream.” Measure upload capacity, then test with motion and audio similar to the actual event. A speed test alone cannot establish that a sustained encoder stream will be stable.
- Confirm the received format. Check that YouTube detects the intended resolution and frame rate and that the broadcast preview has the expected image and sound.
- Watch OBS statistics. Look for dropped frames, encoding lag, or rendering lag. Network-related drops point to delivery trouble; encoding or rendering lag points toward GPU, scene, or workload pressure. Reduce the output load and test again if errors persist.
- Read YouTube’s stream-health messages. In Live Control Room, investigate ingest warnings and health notices instead of assuming that the configured bitrate is reaching YouTube cleanly.
- Test realistic movement. Static menus or slides are not representative of gameplay, camera movement, or other high-motion material. Use a test that resembles the planned broadcast.
- Recheck audio. Confirm levels, channel configuration, sync, and that the intended sources are present.
YouTube does not specify a universal extra upload-bandwidth margin in the cited guidance. Do not interpret the recommended encoder bitrate as a promise that a connection with exactly that measured capacity will be reliable; validate the actual sustained stream and adjust if needed.
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Troubleshooting common 4K60 Ubuntu problems
| Symptom | Likely cause | What to check or change |
|---|---|---|
| No NVENC option appears in OBS | Driver not loaded, unsupported GPU/OBS combination, or an OBS package/environment that does not expose the encoder. | Confirm the NVIDIA driver is installed and active, restart if required, compare the exact GPU and OBS release notes, and use an OBS installation method documented for your Ubuntu release. |
| AV1 or H.265 is absent | The particular GPU, driver, or OBS build may not expose that codec. | Choose a codec actually available in OBS, then use its matching YouTube bitrate recommendation. Do not infer codec support from the card brand alone. |
| YouTube reports an unstable or low-bitrate stream | The connection may not sustain the selected bitrate, or the output may not be configured as intended. | Check OBS network drops and YouTube health messages; verify CBR and the correct codec-specific rate. Test again, or lower resolution/frame rate if the upload path cannot sustain 4K60. |
| Encoding or rendering lag | The GPU may be overloaded by the encode, scene, filters, or other GPU work. | Check OBS statistics, simplify the scene or effects, close competing GPU workloads, and repeat a representative test. If it still cannot hold 60 fps, reduce output demands. |
| Stream starts but the key or destination fails | Wrong, outdated, or mismatched server URL/key; protocol configuration mismatch. | Copy the current URL and key from the selected YouTube broadcast, update OBS’s stream settings, and keep the key private. |
| Image appears washed out or colors look wrong | Color settings or an unintended SDR/HDR mismatch. | For SDR, check Rec. 709 and the source/capture color pipeline. Enable HDR only when the whole capture and encoding chain is configured for it. |
Copyright, reused material, and channel rules still apply
Correct encoder settings do not grant rights to the video, music, or other material you broadcast. Use content you own or are authorized to stream, and review YouTube’s applicable copyright and live-streaming rules before going live. A technically healthy stream can still be claimed, blocked, or otherwise affected by rights or platform-policy issues.
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