Match FFmpeg’s outgoing video bitrate to YouTube’s published recommendation for the incoming codec, resolution, and frame rate. YouTube calls for constant bitrate (CBR) encoding, recommends a two-second keyframe interval (no more than four seconds), and advises testing with representative motion and audio before a broadcast. There is no single bitrate limit that applies to every live stream: YouTube publishes different minimum and recommended values for each mode.
Choose the right YouTube bitrate for your stream
Use the row for the resolution and frame rate you will send to YouTube, then the column for your ingest codec. These are YouTube’s published live-ingest figures, not upload recommendations for prerecorded videos. “Minimum” and “recommended” are distinct: aim for the recommended value when your connection can sustain it reliably.
| Ingest resolution and frame rate | H.264 minimum | H.264 recommended | AV1 / H.265 minimum | AV1 / H.265 recommended |
|---|---|---|---|---|
| 2160p (4K), 60 fps | 14 Mbps | 50 Mbps | 10 Mbps | 35 Mbps |
| 2160p (4K), 30 fps | 11 Mbps | 42 Mbps | 8 Mbps | 30 Mbps |
| 1440p, 60 fps | 8 Mbps | 34 Mbps | 6 Mbps | 24 Mbps |
| 1440p, 30 fps | 7 Mbps | 21 Mbps | 5 Mbps | 15 Mbps |
| 1080p, 60 fps | 6 Mbps | 17 Mbps | 4 Mbps | 12 Mbps |
| 1080p, 30 fps | 5 Mbps | 14 Mbps | 4 Mbps | 10 Mbps |
| 720p, 60 fps | 3 Mbps | 8 Mbps | 2 Mbps | 6 Mbps |
| 720p, 30 fps | 3 Mbps | 8 Mbps | 2 Mbps | 6 Mbps |
| 480p, 30 fps | 0.4 Mbps | 4 Mbps | 0.3 Mbps | 3 Mbps |
| 360p, 30 fps | 0.4 Mbps | 4 Mbps | 0.3 Mbps | 3 Mbps |
Source: YouTube Help: Choose live encoder settings, bitrates, and resolutions (checked October 3, 2026). The values are recommendations and minima, not one universal cap. Confirm the current table before a high-stakes broadcast because YouTube may revise its guidance.
Keep video bitrate separate from total upload use
The table’s target is for video. Audio and transport overhead also use bandwidth, so the connection needs headroom above the video target. A speed test is a starting point, not proof that the connection can sustain a live stream without variation. YouTube says, “We recommend running a speed test to test your upload bitrate.”
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Set FFmpeg to match the selected ingest mode
Before setting encoder options, establish the exact output resolution, frame rate, and codec that FFmpeg will send. Then use the corresponding recommended bitrate if the connection can sustain it; otherwise choose a lower supported mode and test again. YouTube lists H.264, H.265 (HEVC), and AV1 as video codecs, and recommends RTMPS for ingest. The available codec depends on the encoder and ingest configuration.
Use CBR and a two-second keyframe interval
- Bitrate behavior: YouTube’s live encoder guidance lists CBR.
- Keyframes: YouTube recommends a two-second frequency and says not to exceed four seconds.
- Frame rate: YouTube’s listed live settings support up to 60 fps.
FFmpeg option names and behavior depend on the installed version and the chosen encoder. The YouTube settings page specifies platform targets; it does not validate one universal FFmpeg command. Check the documentation for your local FFmpeg build and encoder, and confirm that the resulting stream actually uses CBR behavior and the intended keyframe interval rather than copying flags from an unrelated setup.
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Audio and advanced encoder settings
YouTube lists AAC or MP3 audio. Its guidance specifies 128 Kbps for stereo and 384 Kbps for 5.1 surround; 5.1 over RTMP/RTMPS is supported only with AAC. Other recommended settings include square pixels, progressive scan, two B-frames, one reference frame, CABAC, 44.1 kHz stereo or 48 kHz 5.1, and Rec. 709 for SDR. YouTube recommends H.265 for HDR and says AV1 is not supported for HDR. Apply settings supported by your specific encoder and ingest mode.
Test before going live, then monitor stream health
- Choose the output mode. Record the actual codec, resolution, and frame rate FFmpeg will send, then select the matching row and codec column in YouTube’s table.
- Check sustained upload capacity. Run a speed test on the connection you will use. Allow room for audio and transport overhead; do not treat the video bitrate as the full network requirement.
- Verify encoder behavior. Configure the selected encoder for CBR and a two-second keyframe interval, checking option syntax and behavior against documentation for your installed FFmpeg build.
- Run a realistic test stream. Include audio and movement comparable to the planned broadcast. YouTube specifically advises that tests include “audio and movement in the video similar to what you’ll be doing in the stream.”
- Watch YouTube’s stream-health messages. Check the status before and during the event. If the connection cannot reliably sustain the configuration, lower the bitrate and, where needed, reduce resolution or frame rate; test the revised mode before relying on it.
Troubleshoot bitrate and stream-health problems
- YouTube reports a bitrate issue: Confirm the actual outgoing codec, resolution, and frame rate, then compare them with the correct table entry. Check that the encoder is using CBR and that its target corresponds to that mode.
- The stream is unstable despite a matching target: The connection may not sustain the video target plus audio and overhead. Test the upload again under the intended conditions, then try a lower resolution, frame rate, or bitrate as appropriate and retest.
- Keyframe warnings appear: Check the selected encoder’s keyframe settings. YouTube recommends two seconds and a maximum interval of four seconds; confirm actual encoder behavior rather than assuming a copied flag has the intended effect.
- Audio does not work as expected: Check that the selected audio codec is AAC or MP3 and that the channel configuration and sample rate fit YouTube’s listed guidance. For 5.1 over RTMP/RTMPS, use AAC.
- A codec or HDR mode is unavailable: Codec availability depends on the encoder and ingest configuration. For HDR, YouTube recommends H.265 and does not support AV1 for HDR.
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