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For a typical H.264 YouTube Live stream, use RTMPS, constant bitrate (CBR), and a two-second keyframe interval. Set the video bitrate to YouTube’s recommendation for your resolution and frame rate; for 1080p60, that is 17 Mbps. In FFmpeg, h264_nvenc is a practical baseline if your NVIDIA GPU and FFmpeg build support it and can encode the workload in real time. Test with representative video and audio, then monitor YouTube’s stream health.
Recommended YouTube Live settings for FFmpeg and NVENC
For a broadly compatible SDR setup, begin with H.264 video over RTMPS. YouTube lists RTMP/RTMPS as ingest protocols, supports H.264, HEVC, and AV1, and specifies CBR, up to 60 fps, and a recommended two-second keyframe interval (four seconds maximum). The settings below describe the H.264 baseline; use another codec only if the encoder and ingest path support it and it suits your workflow.
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| Setting | Starting point | Important qualification |
|---|---|---|
| Transport | RTMPS | Use an RTMPS ingest URL where available. |
| Video encoder | h264_nvenc |
Requires a compatible NVIDIA GPU and FFmpeg build exposing NVENC. |
| Rate control | CBR | YouTube specifies constant bitrate for live ingest. |
| Keyframe interval | 2 seconds | YouTube recommends two seconds and sets a four-second maximum. |
| Frame rate | Match the source, up to 60 fps | Choose the bitrate for the actual output frame rate and resolution. |
| SDR color | Rec. 709, 8-bit | YouTube’s advanced recommendations also include progressive scan and square pixels. |
| Audio | AAC or MP3; stereo AAC at 44.1 kHz and 128 Kbps is a practical starting point | YouTube lists AAC or MP3 and recommends 44.1 kHz for stereo with 128 Kbps stereo audio. |
Choose the H.264 bitrate for your resolution and frame rate
Use YouTube’s displayed H.264 recommendations as the target output bitrate. The figures below are from YouTube Help’s “Choose live encoder settings, bitrates, and resolutions” page, accessed October 3, 2026; the retrieved page did not state a publication year.
| Ingest resolution and frame rate | Recommended H.264 bitrate |
|---|---|
| 2160p60 | 50 Mbps |
| 2160p30 | 42 Mbps |
| 1440p60 | 34 Mbps |
| 1440p30 | 21 Mbps |
| 1080p60 | 17 Mbps |
| 1080p30 | 14 Mbps |
| 720p60 | 8 Mbps |
| 720p30 | 8 Mbps |
| 480p30 | 4 Mbps |
| 360p30 | 4 Mbps |
For the common question “What bitrate should I use for 1080p60?”, YouTube’s H.264 recommendation is 17 Mbps. Your upload connection needs reliable headroom for the encoded video and audio; a connection that only intermittently reaches the target can cause instability. If it cannot sustain the chosen output, reduce resolution or frame rate and select the corresponding recommendation rather than forcing a higher-quality setting.
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Pick an NVENC preset and tune for real-time encoding
NVENC preset choice is a speed-versus-quality tradeoff, and the best option depends on GPU generation, workload, and FFmpeg build. NVIDIA documents presets and low-latency tuning for real-time broadcast use. Treat p4 or p5 with a low-latency tune as starting points to test, not universal best settings. Confirm that the installed FFmpeg accepts the option names and that the GPU can sustain the chosen resolution, frame rate, and scene complexity.
NVIDIA’s FFmpeg guidance describes CBR with a one-second VBV buffer for predictable bandwidth and performance in its real-time game and studio broadcasting scenario. That is NVIDIA’s scenario-specific guidance, not a YouTube requirement; YouTube specifies CBR, but does not require that buffer value. Buffer sizing and tuning can vary by workload and FFmpeg build.
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Build the FFmpeg command around your actual input
FFmpeg command-line options apply to the input or output that follows them, so place capture or input options before -i, and encoding and delivery options after it. The following is an illustrative template, not a tested complete command: replace the input, ingest URL, stream key, dimensions, frame rate, and bitrate for your setup. Keep the stream key private.
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ffmpeg [input options] -i "INPUT"
-c:v h264_nvenc -preset p4 -tune ll
-rc cbr -b:v 17M -maxrate 17M -bufsize 34M
-g 60 -bf 2
-c:a aac -b:a 128k -ar 44100 -ac 2
-f flv "rtmps://INGEST-URL/STREAM-KEY"This example assumes 1080p60 H.264, so its video bitrate is 17 Mbps and its GOP is 60 frames (two seconds at 30 fps would instead use -g 60; at 60 fps, use -g 120). Set the output dimensions and frame rate through the input or output filter appropriate to your source; the template does not scale or capture a source by itself. The -bufsize value is illustrative only, not a universal recommendation. Check the accepted NVENC options with your installed FFmpeg and confirm actual keyframe timing rather than assuming the command produces it identically on every build.
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YouTube’s advanced picture recommendations include two B-frames, one reference frame, CABAC, progressive scan, square pixels, Rec. 709, and 8-bit SDR. NVENC option availability and behavior may vary by GPU, FFmpeg version/build, and supported NVENC SDK/runtime; use your build’s help output and test instead of assuming every option maps identically.
Test the whole stream before the event
- Confirm hardware and software support. Verify that the NVIDIA GPU supports the codec and features you intend to use, and that your FFmpeg build exposes
h264_nvencand the selected preset and tune options. - Match the output to the source and bandwidth. Set the resolution, frame rate, and H.264 bitrate together. Check that the GPU can encode representative content in real time and that the upload connection remains stable.
- Run a representative test. Include the movement, scene changes, and audio conditions expected during the event. YouTube advises testing before starting a live stream.
- Watch YouTube’s stream health. During the test and event, review stream health and any messages; a successful connection alone does not establish that the stream is healthy.
Common problems and what to check
- FFmpeg reports that
h264_nvencis unavailable: the installed build may not expose NVENC, or the GPU/software combination may not support it. Verify the build and hardware rather than changing bitrate settings. - The stream connects but YouTube reports poor health: check whether the upload connection can sustain the target bitrate, then test at a lower resolution or frame rate with the matching YouTube recommendation. Review YouTube’s health messages.
- Motion looks poor or the image breaks up: test the stream with representative motion and confirm that the selected bitrate matches the output resolution and frame rate. Also verify that encoding remains real-time under load.
- Keyframe timing is rejected or behaves unexpectedly: check the output frame rate and set the GOP to twice that rate for a two-second interval; verify behavior with the actual encoder and ingest health.
- An option is rejected or has no apparent effect: NVENC parameters vary with FFmpeg build, SDK/runtime, and GPU support. Consult the installed build’s available options and test the resulting stream.
- Audio is missing or unsuitable: check that an audio stream is present in the input and that the output uses a supported codec and appropriate stereo sample rate and bitrate.
Copyright and YouTube live-stream rules
Technical compliance does not guarantee permission to broadcast content. Before going live, make sure you have the rights needed for the video, music, and other material in the stream, and review YouTube’s current live-stream requirements. YouTube may interrupt a stream for platform or rights-related reasons; monitor its notices and stream-health messages during the event.
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