Use CBR for the encoder feed sent to YouTube Live. YouTube’s published Live encoder settings specify constant bitrate. Its separate recommendation for VBR applies to uploading a video file—not to sending a prerecorded playlist through a live encoder.
Why the delivery path matters
CBR aims to keep the encoded bitrate steady over time; VBR varies it with the complexity of the video and audio. The fact that your source is prerecorded does not change the delivery method: if an encoder sends it as a live feed, use YouTube’s Live ingest guidance. If you upload a finished file through YouTube’s upload workflow, use the upload recommendations instead.
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| Workflow | YouTube’s published bitrate mode | Which guidance to follow |
|---|---|---|
| Prerecorded playlist sent as an encoder feed to YouTube Live | CBR | Live encoder settings |
| Video file uploaded to YouTube | VBR | Upload encoding settings |
These are workflow-specific recommendations, not a published comparison proving that one mode always produces better picture quality or uses less bandwidth. YouTube’s official pages do not establish that VBR is impossible in every third-party encoder; the practical choice for YouTube Live is to follow its stated CBR recommendation.
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Choose the Live bitrate for your stream
CBR is a mode, not a bitrate value. Choose the bitrate separately using the Live table row that matches your video codec, resolution, and frame rate. YouTube’s H.264 recommendations include:
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| Ingest resolution and frame rate | Recommended H.264 bitrate |
|---|---|
| 1080p at 30 fps | 14 Mbps |
| 1080p at 60 fps | 17 Mbps |
| 720p at 30 fps | 8 Mbps |
| 720p at 60 fps | 8 Mbps |
These figures are YouTube-published recommendations, not independent test results. YouTube also provides codec-specific guidance for other resolutions and frame rates, and separate recommendations for H.265/HEVC and AV1. Check the current Live encoder settings and bitrate table for your exact combination; the figures may change.
Set up the encoder and check the connection
- Choose the codec, resolution, and frame rate. Make sure they match what your encoder will send, then consult YouTube’s Live bitrate table for that combination. YouTube supports RTMP/RTMPS ingest and lists H.264, H.265/HEVC, and AV1 video, with frame rates up to 60 fps.
- Set bitrate encoding to CBR. Enter the recommended bitrate for the selected codec, resolution, and frame rate in your encoder’s live output settings.
- Set a two-second keyframe interval. YouTube recommends two seconds and says the interval should not exceed four seconds.
- Check audio settings. YouTube lists AAC or MP3 as audio options; consult its Live settings for limitations that apply to a particular audio configuration.
- Verify upload capacity with headroom. The connection’s available outbound bandwidth must support the stream’s total bitrate. YouTube recommends leaving 20% spare upload bandwidth, rather than operating at the connection’s limit. See YouTube’s streaming tips as well as its encoder settings.
- Test before relying on the playlist. Start a test stream and monitor stream health for connection or encoding problems before using the setup continuously.
YouTube automatically transcodes a live stream into multiple output formats for viewers using different devices and networks. That does not change the encoder’s job: send a stable Live feed using the settings appropriate to your source and connection.
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Choose how to send a prerecorded playlist
YouTube’s encoder setup guidance describes software encoders and standalone hardware encoders, and lists a cloud service for continuous prerecorded streaming. These are ways to deliver the feed; they do not change YouTube’s stated CBR recommendation for Live ingest. A cloud service is an optional workflow, not a requirement for choosing a bitrate mode. See YouTube’s encoder setup guide.
Or let it run in the cloud
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Troubleshooting common setup problems
- You are unsure whether to choose CBR or VBR: Check how the video is being delivered. Use CBR for the encoder feed to Live; VBR belongs to YouTube’s separate file-upload recommendations.
- The stream bitrate exceeds available upload bandwidth: Recheck the total bitrate against outbound capacity and preserve the recommended 20% spare bandwidth. If needed, choose a lower supported resolution or frame rate and use its matching recommendation in YouTube’s Live table.
- Your encoder’s available values do not match the cited examples: The examples above cover only four H.264 combinations. Consult YouTube’s current table for your actual codec, resolution, and frame rate rather than applying one of those values to a different setup.
- The stream has problems despite matching the bitrate: Confirm the keyframe interval is two seconds or no more than four, check audio compatibility, test the connection before the stream, and monitor YouTube’s stream health. A bitrate recommendation alone does not guarantee a particular viewer experience.
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