For 4K (3840×2160) at 60 fps, YouTube’s recommended H.264 live video bitrate is 50 Mbps; its listed minimum is 14 Mbps. Use CBR, RTMPS where available, and a two-second keyframe interval—120 frames at 60 fps. The FFmpeg command below is a starting point, not a tested or universally suitable preset: confirm that your source, network and encoder can sustain it before going live.
Baseline FFmpeg command
Replace the input path, ingest endpoint and stream key with your own. Get the ingest URL and stream key from YouTube Live Control Room.
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ffmpeg -re -i INPUT
-c:v libx264 -preset veryfast -profile:v high -pix_fmt yuv420p
-r 60 -g 120 -keyint_min 120 -sc_threshold 0 -bf 2 -refs 1
-b:v 50M -minrate 50M -maxrate 50M -bufsize 100M
-color_primaries bt709 -color_trc bt709 -colorspace bt709
-c:a aac -b:a 128k -ar 44100 -ac 2
-f flv 'rtmps://YOUR_INGEST_URL/YOUR_STREAM_KEY'This example follows YouTube’s ingest guidance and documented FFmpeg/libx264 controls; it has not been tested. FFmpeg’s -b:v value is in bits per second, so 50M means 50 Mbps. The FFmpeg libx264 wrapper also accepts x264 options, whose units can differ: x264’s own bitrate parameter is expressed in kilobits per second. See the FFmpeg documentation.
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Use -re to pace a file input in real time. For live capture, omit -re and use the capture input appropriate to your system. The source should actually be progressive 3840×2160 at 60 fps; add scaling or frame-rate conversion only when needed.
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Keyframes and rate control
At 60 fps, a two-second GOP is 120 frames. -g 120 sets that maximum GOP length, while -keyint_min 120 and -sc_threshold 0 aim to keep keyframes regularly spaced. Equal target, minimum and maximum video rates express the intended CBR mode. The 100 Mbps buffer is an implementation choice in this example, not a YouTube requirement.
Why these settings fit YouTube’s 4K60 live guidance
YouTube’s current live encoder guidance recommends 50 Mbps for H.264 at 4K/2160p and 60 fps, and lists 14 Mbps as the minimum. The minimum is not a quality target. YouTube also recommends CBR and a two-second keyframe interval, and says not to exceed four seconds.
| Setting | Starting value | Purpose and qualification |
|---|---|---|
| Resolution and frame rate | 3840×2160 progressive, 60 fps | Confirm the source really supplies this mode; don’t label upscaled or lower-frame-rate input as native 4K60. |
| Video codec | H.264 with libx264 |
Matches the requested software encoder and YouTube’s H.264 ingest option. |
| Video bitrate | 50 Mbps recommended; 14 Mbps minimum | YouTube’s H.264 4K60 live ingest figures. The minimum is not a recommended quality setting. |
| Rate control | CBR intent | YouTube recommends CBR for live encoding; equal target, minimum and maximum rates express that intent in this FFmpeg command. |
| Keyframe interval | 2 seconds / 120 frames | YouTube recommends two seconds and says not to exceed four seconds. |
| B-frames and references | 2 B-frames; 1 reference | Values listed in YouTube’s advanced guidance; verify behavior with your installed x264 build. |
| Pixel format and profile | yuv420p; High Profile |
Common 8-bit SDR compatibility choices; YouTube’s advanced guidance specifies 8-bit SDR and square pixels. |
| SDR color | Rec. 709 | YouTube recommends Rec. 709 for SDR. |
| Audio | AAC stereo, 44.1 kHz, 128 kbps | Matches YouTube’s listed stereo guidance for RTMP/RTMPS. |
| Transport and muxer | RTMPS with FLV muxing | YouTube recommends RTMPS; FFmpeg uses FLV muxing for RTMP-family output. |
Check that your computer and connection can sustain it
Choose a preset by testing the actual workload
veryfast is only a starting preset. Neither YouTube nor FFmpeg guarantees that a particular CPU or preset will encode 4K60 in real time. A slower preset may improve compression efficiency if the system can sustain it; a faster preset may be necessary if frames are missed, with a possible quality trade-off. Test representative footage and audio on the machine you plan to use, and watch encoder speed, dropped frames and YouTube’s stream-health warnings.
Plan for upload capacity
The encoder sends roughly 50 Mbps of video at the recommended H.264 target, in addition to audio and protocol overhead. Your sustained upload capacity must exceed the outgoing stream rate with room for normal variation; a speed-test peak alone does not establish that the connection can hold a live stream. Test the actual network path and monitor YouTube’s stream health during a representative test.
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RTMPS and latency
Use the RTMPS ingest endpoint shown in Live Control Room when available; YouTube recommends RTMPS over RTMP. YouTube says 4K/2160 streams do not have the low-latency option and are optimized for quality at normal latency.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do not confuse live bitrate with upload encoding
The 50 Mbps figure is a live ingest video target, not a recommendation for an uploaded video file. YouTube’s separate upload encoding recommendations cover video uploads and specify different guidance, including variable bitrate. Don’t substitute upload settings for live ingest settings.
Troubleshoot common failures
- FFmpeg cannot connect: Recheck the ingest URL and stream key in Live Control Room, including accidental whitespace or an outdated key. Confirm that the network permits the selected RTMPS connection.
- Stream health reports insufficient bitrate or instability: Confirm the outgoing bitrate and whether the connection can sustain it. If it cannot reliably sustain the 50 Mbps target, resolve the network limitation or test a lower bitrate; YouTube lists 14 Mbps as the H.264 4K60 minimum, not a quality guarantee.
- Encoding falls behind or frames drop: Test with representative content, then try a faster x264 preset or reduce the output workload if necessary. Verify output resolution and frame rate rather than assuming the input and encoder are keeping up.
- Keyframes are not regularly spaced: Check that the output is actually 60 fps and that the installed encoder accepts the options. FFmpeg builds and available encoder options vary; inspect the installed build’s encoder help and verify the resulting stream.
- Color or playback looks wrong: Confirm the material is SDR before applying Rec. 709 tags. Check that the source and output pixel format, scan mode and frame rate are what you intend.
- Audio is absent or incompatible: Confirm the input has an audio stream and that the output is AAC stereo at the specified sample rate and bitrate.
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