For a stable 24/7 YouTube stream, configure OBS to use an available NVIDIA NVENC encoder, send the stream over RTMPS, use CBR, set a two-second keyframe interval, and choose a bitrate from YouTube’s live table for your resolution, frame rate, and codec. Then test the real scene and audio, leave upload bandwidth headroom, and monitor the system before trusting it unattended. The right preset depends on your GPU, OBS version, stream workload, and connection; no single configuration guarantees continuous uptime.
Configure NVENC in OBS for YouTube Live
These steps describe a general SDR setup. OBS labels and available encoders can vary by version, operating system, and NVIDIA GPU. YouTube’s live settings are distinct from its recommendations for uploaded video files.
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Confirm NVENC and choose an ingest format
In OBS, open Settings > Output and set Output Mode to Advanced if needed. Under the Streaming tab, select an NVIDIA NVENC encoder exposed by your installed build. NVENC is a dedicated NVIDIA hardware encoder, but supported codecs vary by GPU generation; check your card’s capabilities rather than assuming it supports H.264, HEVC, or AV1. See NVIDIA’s NVENC Application Note and OBS’s NVENC documentation.
For a straightforward SDR stream, H.264 over RTMPS is a broadly supported starting point. YouTube lists H.264, H.265/HEVC, and AV1 for RTMP/RTMPS encoder streams and recommends RTMPS, which encrypts the stream in transit to and within Google’s servers. Confirm that your selected codec is supported by both the GPU and the YouTube ingest workflow you use. See YouTube’s live encoder settings.
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Set CBR and the keyframe interval
In OBS’s streaming output settings, set Rate Control to CBR and Keyframe Interval to 2 s. YouTube recommends a two-second interval and specifies a maximum of four seconds for its live encoder settings. These are live-ingest settings, not VOD upload settings.
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Set resolution, frame rate, and bitrate
Choose the output resolution and frame rate in Settings > Video, then select the matching row and codec column below. YouTube’s published recommendations are in Mbps; they are targets for the encoder feed, not proof that your internet connection can sustain them.
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Live output AV1 or HEVC recommended H.264 recommended 1080p30 10 Mbps 14 Mbps 1080p60 12 Mbps 17 Mbps 1440p30 15 Mbps 21 Mbps 1440p60 24 Mbps 34 Mbps 2160p30 30 Mbps 42 Mbps 2160p60 35 Mbps 50 Mbps These are YouTube Help’s recommended live bitrates; check its current encoder settings table before configuring a stream because platform requirements can change. Use the row matching both resolution and frame rate, and the column matching the selected codec.
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Set video structure, color, and audio
YouTube’s advanced live settings specify progressive scan, two B-frames, one reference frame, CABAC, and square pixels. For SDR, use Rec. 709 and 8-bit video. Set audio to AAC or MP3; YouTube lists 128 kbps for stereo audio. The exact controls exposed by OBS depend on the selected encoder and output mode, so do not force a control your encoder does not offer. Consult YouTube’s live encoder settings.
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Choose a sustainable NVENC preset
NVIDIA’s OBS broadcasting guide uses P6 (slower/better quality) as a starting point, with Look-ahead and Psycho Visual Tuning enabled. These are vendor starting recommendations, not a validated preset for every 24/7 system. Look-ahead uses CUDA; NVIDIA advises disabling it if GPU utilization is high. Test the actual scene and workload, and reduce preset demands if OBS reports encoding overload or rendering lag. See NVIDIA’s broadcasting guide and OBS’s NVENC options.
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Connect OBS to the correct YouTube stream
In YouTube Studio’s live control room, obtain the stream key for the intended stream and enter it in OBS under Settings > Stream, choosing the YouTube service or the appropriate RTMPS server workflow. Treat the key like a password: do not publish it or include it in a recording or screenshot. If a key may have been exposed, replace it in YouTube Studio and update OBS. The exact YouTube Studio labels can change; use YouTube’s live streaming setup guidance.
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Choose H.264, HEVC, or AV1
For a basic SDR configuration, H.264 over RTMPS is a practical starting point. HEVC and AV1 are also listed by YouTube for RTMP/RTMPS, but availability depends on both your GPU’s NVENC generation and the workflow you configure. Bitrate recommendations differ by codec, so use the corresponding table column rather than carrying an H.264 value over to another codec. GPU codec support is model-dependent; NVIDIA’s NVENC Application Note describes the hardware encoder, and YouTube’s encoder settings lists supported live formats.
Plan for uninterrupted operation
A correct encoder profile cannot compensate for an unstable connection, GPU overload, overheating, or loss of power. YouTube recommends that total stream bitrate fit within available upload bandwidth and suggests leaving 20% headroom. If you configure a primary and backup feed, include both bitrates when sizing outbound capacity. YouTube also advises testing failover, checking that the event is accessible, monitoring audio and video quality, and verifying local archive files when recording. See YouTube’s live streaming tips.
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- Network: Test sustained upload capacity, not just a short peak. Keep the stream bitrate within the available upload budget with the recommended headroom.
- GPU and scene load: Test the actual overlays, browser sources, transitions, and motion. Watch OBS’s rendering and encoding indicators while the stream runs.
- Thermals and power: For an unattended PC, check cooling and power continuity under sustained load. A UPS may reduce the risk of a brief power interruption, but it does not protect against every outage or network failure.
- Recovery: Test what happens after OBS restarts, the network reconnects, or YouTube interrupts ingestion. YouTube recommends testing failover; recovery behavior depends on your setup.
- Monitoring: Use YouTube’s stream health messages and check audio and video quality over a representative period before leaving the stream unattended.
Test before leaving the stream unattended
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Preview representative content
Test movement and audio like those in the real stream, then preview before going live. A static test image does not reveal how motion, overlays, or scene changes behave at the selected bitrate. YouTube says, “Make sure to test before you start your live stream.”
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Check bandwidth and stream health
YouTube recommends running a speed test to test upload bitrate. Confirm the connection can carry the configured stream with headroom, then watch YouTube’s stream health messages for interruptions or quality problems.
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Run a long-duration operational test
Before relying on the setup 24/7, leave it running long enough to observe sustained GPU load, temperatures, network stability, power behavior, and restart or recovery behavior. This is a practical unattended-operation check, not a YouTube-prescribed duration or a guarantee of uptime.
HDR requires a different workflow
Do not use the SDR H.264 recipe unchanged for HDR. YouTube’s HDR guidance calls for HEVC, 10-bit video, BT.2020 color primaries and matrix, and PQ or HLG transfer characteristics. Its documented OBS workflow uses a hardware HEVC encoder, Main 10 profile, P010 color format, and Rec. 2100 PQ or HLG. Requirements differ by ingest route: the HDR page describes HLS requirements and RTMP(S) HDR support with stream-key settings. For its documented RTMPS HDR workflow, the page specifies OBS 30.1 as a minimum. Check the current instructions for the workflow you choose in YouTube’s HDR live streaming guidance.
Troubleshoot common NVENC problems
- NVENC does not appear in OBS: The installed GPU or OBS build may not expose that encoder or codec. Check the GPU’s supported NVENC codecs and update or verify the installed OBS and graphics-driver setup; do not select an unsupported codec by assumption.
- YouTube reports a bitrate or connection problem: Check that OBS is using CBR, that the bitrate matches the chosen codec/resolution/frame-rate row, and that sustained upload capacity includes headroom. Re-run an upload speed test and check YouTube stream health.
- OBS reports encoding overload: Reduce encoding demand by testing a less demanding NVENC preset and disabling Look-ahead if GPU utilization is high. Confirm the GPU supports the selected output and that the real scene does not overload the system.
- OBS reports rendering lag: Scene rendering competes for GPU resources even when encoding is on NVENC. Test with the actual scene, reduce graphics workload if needed, and reassess whether the GPU has enough sustained headroom.
- HDR looks wrong or the stream is rejected: Verify HEVC, 10-bit output, Main 10, P010, the correct Rec. 2100 PQ or HLG transfer, and the color primaries/matrix. Confirm the ingest route’s requirements and OBS version against YouTube’s HDR instructions.
- The stream stops after a disconnect or restart: Test the recovery path rather than assuming OBS or YouTube will resume as intended. Check stream key, server/workflow, network reconnection, and any failover configuration, then observe YouTube stream health during the test.
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