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How to stream horizontal and vertical at the same time

To stream in both formats, keep the main signal in 16:9 and re-encode the vertical destination with a 9:16 crop. Copying the horizontal picture to a vertical platform usually produces bars, a wrong crop or a rejected stream.

Published
Reading time
3 min read
Corneta version
0.11.0
Tested with
Corneta 0.6.0 (Windows 11), OBS Studio 32.2.1 (Windows 11)

Build two outputs, not two improvised streams

Use OBS in 16:9 as the main source. In Corneta, leave Quality on Smart: it copies Twitch, Kick and YouTube when the signal already fits and re-encodes the upright 9:16 destination on its own. Just don't force Copy on that destination or use Straight up: then the video goes out sideways and either comes out wrong or doesn't get in at all.

Enlarge image

Fit
Vertical TikTok destination on Corneta's Platforms screen, with the ingest URL and the Frame the 9:16 action.

A vertical destination needs re-encoding and its own framing; it shouldn't get a blind copy of the 16:9.

A vertical destination needs re-encoding and its own framing; it shouldn't get a blind copy of the 16:9.Source: CornetaCorneta version: 0.11.0

The vertical destination uses an encoder session and more upload. The format doesn't come from rotating the picture: it comes from choosing what stays inside the narrow frame.

On YouTube, the platform itself creates a 9:16 version of your horizontal stream by default, with a center crop or other layouts, when you stream through Live Control Room. Decide before going live: YouTube doesn't let you add the vertical version after the stream has started.

Choose the framing

  1. Add TikTok or Instagram in Platforms. They're Corneta's upright destinations, still marked as experimental.
  2. Enter the URL and key provided by the platform's dashboard.
  3. Open Frame the 9:16 and click Grab a frame from OBS to see your real scene. Grabbing a frame works while OBS is live; if you don't move anything, the center crop is used.
  4. Position the 9:16 strip over your face, camera, scoreboard or the main action.
  5. Adjust the zoom without cutting off essential text.
  6. Save and check the result with real movement.

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Fit
Corneta's vertical framing editor with a 9:16 area, a zoom control and a preview of the result.

With a frame grabbed from OBS, the editor shows which strip of the horizontal frame goes into the 720×1280.

With a frame grabbed from OBS, the editor shows which strip of the horizontal frame goes into the 720×1280.Source: CornetaCorneta version: 0.11.0

The editor is manual. Corneta doesn't promise auto-reframing and doesn't follow a person on its own. If the focus moves around a lot during the stream, set up a layout that stays readable in the center or use a tool with an independent vertical canvas.

What fits in the center

A 9:16 crop of a 16:9 frame throws away a good part of the sides. Before you stream:

  • move your webcam and important captions to the center zone;
  • avoid scoreboards pinned to the corners;
  • don't use small text designed only for horizontal 1080p;
  • test the game's menus, map and HUD;
  • check the overlay on a phone, not just on your monitor.

What it costs your machine

A vertical output has to scale and re-encode. If OBS already uses the GPU encoder, confirm how many simultaneous sessions your driver supports. Corneta sends the vertical output at 720×1280 and 30 FPS. What you can raise is the bitrate, from Standard to Sharp in the fine-tuning on the Quality screen, and only after a stable test stream.

If the preview stutters, follow the order in the guide to multistreaming on a low-end PC.