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Recommended H.264 bitrate and keyframe settings
YouTube’s live encoder guidance recommends a 2-second keyframe interval and says not to exceed 4 seconds. For H.264, its recommended video bitrates are:
| Ingest resolution and frame rate | Recommended video bitrate | FFmpeg GOP size for a 2-second interval |
|---|---|---|
| 720p30 | 8 Mbps | 60 frames |
| 720p60 | 8 Mbps | 120 frames |
| 1080p30 | 10 Mbps | 60 frames |
| 1080p60 | 17 Mbps | 120 frames |
| 1440p30 | 21 Mbps | 60 frames |
| 1440p60 | 34 Mbps | 120 frames |
| 2160p30 | 42 Mbps | 60 frames |
| 2160p60 | 50 Mbps | 120 frames |
The bitrate figures are YouTube recommendations for live H.264 input, not guarantees that a particular connection or video scene will sustain them. Select a stream quality your upload connection can maintain reliably, and test before the event. The GOP values are the frame-count conversion for a 2-second interval: frame rate multiplied by two.
Set the bitrate and GOP in FFmpeg
This example is a starting template for 1080p30 H.264. Replace VIDEO_INPUT with your input and replace the sample RTMPS destination with the ingest URL and stream key shown in YouTube Live Control Room. Treat the complete destination as a secret: anyone who obtains your stream key may be able to send video to your channel.
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ffmpeg -re -i VIDEO_INPUT
-c:v libx264 -pix_fmt yuv420p
-b:v 10M -maxrate 10M -bufsize 20M -g 60
-c:a aac -b:a 128k -ar 44100
-f flv 'rtmps://YOUR_YOUTUBE_INGEST_URL/YOUR_STREAM_KEY'Here, -b:v sets the target video bitrate, -maxrate sets the rate-control ceiling, -bufsize configures the rate-control buffer, and -g sets the GOP interval in frames for libx264. The example’s 20 Mbps buffer is a practical rate-control choice, not a YouTube-mandated value. -re reads the input at its native rate, which is useful when sending a file as a live stream rather than feeding input captured in real time.
Adjust the template for a different frame rate or resolution
- 1080p60: change the video bitrate values to
17Mand set-g 120. - 720p30: use
8Mfor the video bitrate values and-g 60. - 720p60: use
8Mfor the video bitrate values and-g 120. - 1440p or 2160p: use the table’s bitrate for the selected frame rate and use
-g 60at 30 fps or-g 120at 60 fps.
The template does not force the input to a specific resolution or frame rate. Make sure the actual encoded output matches the resolution and frame rate whose bitrate you selected. If you need to scale or change frame rate, add the appropriate video filter and output-rate settings for your source rather than assuming that the bitrate option performs that conversion.
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Other encoder settings that matter
YouTube’s advanced live guidance lists progressive scan; 2 B-frames and 1 reference frame; CABAC; square pixels; Rec. 709 for SDR; 8-bit SDR; and AAC or MP3 audio. It lists 44.1 kHz for stereo, 48 kHz for 5.1 audio, and 128 Kbps stereo audio. The example uses AAC stereo at 128 Kbps and 44.1 kHz.
Do not add -tune zerolatency by default. It changes encoder behavior and may conflict with the listed B-frame recommendation. Use it only when you have a specific latency requirement, then verify the resulting stream rather than assuming all recommended settings still apply.
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YouTube’s live bitrate table also includes minimum bitrates and AV1/H.265 recommendations. The figures above are specifically its H.264 recommended values. Do not substitute YouTube’s upload bitrate table: that guidance is for completed video files, not live encoder input.
Send the stream securely and verify it before going live
- Get the destination from YouTube Live Control Room. Use the account-specific ingest URL and stream key displayed for the stream; do not copy an example key or expose your own key in public commands, screenshots, or logs.
- Use RTMPS when available. YouTube recommends RTMPS, the encrypted extension of RTMP. Use the RTMPS ingest address supplied by YouTube where available.
- Test with representative content. Before the event, send a test that includes the kinds of movement and audio your actual programme will contain. A static image is not a meaningful test of a fast-moving documentary sequence.
- Check YouTube’s stream health. Watch the health panel and its messages during the test and event. A configured bitrate is useful only if the upload can sustain it reliably.
- Confirm your FFmpeg build and output. Available encoder options can vary by FFmpeg build. Check that libx264 is available, confirm the output resolution and frame rate, and verify stream health instead of treating a successful command launch as proof of a healthy broadcast.
Troubleshoot common bitrate and keyframe problems
- Unstable stream or health warnings: the connection may not reliably sustain the selected bitrate. Test the upload under realistic conditions and choose a lower resolution, frame rate, or bitrate if needed; a higher setting does not help if the connection cannot carry it steadily.
- Keyframe interval longer than recommended: calculate GOP frames from the output frame rate and set
-gto twice that rate for a 2-second interval—60 at 30 fps or 120 at 60 fps. Keep the interval within YouTube’s 4-second maximum. - Unexpected image quality or output dimensions: verify the actual encoded resolution, frame rate, and pixel format. The recommended bitrate is tied to the input resolution and frame rate; bitrate alone does not resize or improve an incorrectly configured output.
- Audio format mismatch: check the output audio codec, channel layout, sample rate, and bitrate. For stereo, the example’s AAC at 128 Kbps and 44.1 kHz matches the listed guidance; 5.1 audio uses 48 kHz in YouTube’s guidance.
- FFmpeg rejects an option or encoder: inspect the installed build’s encoder availability and options. FFmpeg capabilities differ by build, so do not assume an option available in another installation exists locally.
- Stream does not reach the intended YouTube broadcast: recheck the current ingest URL and stream key in Live Control Room. If the key may have been exposed, replace or reset it there before sending another stream.
Keep a pre-recorded YouTube stream running without a local FFmpeg machine
If your goal is to loop uploaded documentary footage on YouTube 24/7, rather than encode and operate FFmpeg yourself, StreamNeo is the cloud alternative: it runs an always-on YouTube stream from uploaded videos, so your computer and home connection do not have to stay on.
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Or let it run in the cloud
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