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How to Switch a YouTube Live Loop from 16:9 to 9:16

Use YouTube Live Control Room’s vertical layout or configure a second encoder stream key to show your loop in 9:16.
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To show a YouTube Live loop in portrait, set up YouTube’s vertical format before you go live. In YouTube Studio’s Live Control Room, edit the vertical layout and choose a crop or fit that suits the video. If you use a third-party encoder, configure separate horizontal and vertical outputs and use the corresponding stream keys. YouTube says you can’t add the vertical format after a stream has started.

Choose how to make the loop vertical

YouTube’s built-in Live Control Room can produce horizontal 16:9 and vertical 9:16 versions together. It is the simpler option if you want YouTube to arrange the vertical view from your existing stream. A third-party encoder is the alternative when you can provide and configure both feeds yourself.

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Consideration Live Control Room layout Third-party encoder
How portrait output is made Choose a vertical layout in YouTube and adjust its framing. The encoder supplies matching horizontal and vertical outputs.
Setup Edit the vertical preview for the scheduled stream before going live. Choose Encoder and RTMP(S), then configure the second stream key for vertical.
Existing wide loop Try center crop, fit to phone width, or stacked, and inspect the preview. Prepare a portrait feed suited to the loop; do not assume YouTube will reconfigure the encoder.

YouTube documents both workflows in its Live Control Room and dual-stream guidance.

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Set up portrait layout in YouTube Live Control Room

  1. On a computer, open YouTube Studio and select Create → Go live.
  2. Open your scheduled stream from the Manage tab.
  3. In the vertical preview, select Edit layout.
  4. Choose Center crop, Fit to phone width, or Stacked. Adjust zoom and position in the canvas, then inspect the preview to ensure the important content remains visible.
  5. Leave dual stream enabled if you want YouTube to serve both horizontal and vertical versions. YouTube documents disabling the vertical output by turning off Dual stream in the Stream tab’s settings.

The default vertical view is a center crop of the horizontal stream. A wide loop may have titles, lyrics, or other key details near the edges that the crop cuts off. Trying another layout and checking the preview is a practical way to catch that before viewers see it; the result depends on the source composition.

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Configure a third-party encoder for dual output

  1. Open the stream’s Stream tab in Live Control Room.
  2. Change the vertical preview setting from Auto to Encoder.
  3. Select RTMP(S) and choose the second stream key for the vertical output.
  4. Configure the encoder to send the horizontal and vertical versions to their corresponding stream keys. Make sure each feed has the intended aspect ratio; changing a file’s aspect ratio in YouTube Studio does not reconfigure an external encoder.
  5. Start the stream from YouTube Studio only after both outputs are configured and checked.

YouTube’s encoder setup guide provides context for creating a live stream with an encoder. Dual-stream-specific key and format setup is covered in its live streaming guidance.

Check the loop before you go live

  • Preview the framing: Check the vertical preview for cropped text, faces, artwork, or other essential material.
  • Test the stream: YouTube recommends preparing ahead, previewing in Live Control Room, and monitoring audio and video quality. See its live streaming tips.
  • Check encoder settings separately: Resolution, codec, frame rate, keyframes, protocol, and bitrate are encoder settings, not layout controls. YouTube’s recommended settings vary by codec, resolution, and frame rate; use its encoder settings and bitrate guidance for the configuration you use.
  • Set portrait up before starting: The vertical format cannot be added once the live stream has begun.

What viewers see with dual stream

YouTube uses one shared stream URL and sends subscribers one go-live notification. Viewers browsing the mobile Shorts feed see the vertical version; other viewers see the horizontal version. Both versions share the same live chat. Vertical live streams can also appear while browsing Shorts in the YouTube mobile app, subject to YouTube’s display and eligibility rules. See YouTube’s dual-stream details.

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Or let it run in the cloud

If your loop is a prerecorded video and you want a YouTube channel to stay live without leaving a computer running, StreamNeo runs the uploaded video from the cloud. Upload the video, add your YouTube stream key, and go live. It plays uploaded videos, not a live camera feed.

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  • Nothing has to stay on at home; the stream runs from the cloud.
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