Can you record dual camera video in landscape on iPhone?
No, not in DualCam, and not in most apps built the same way. This is not a toggle that got left out of a settings menu. The recorded frame is a fixed-size canvas that the two camera images are drawn into as you shoot, and that canvas is defined as a vertical rectangle before recording ever starts. There is no landscape version of it to switch to, in the same way there is no landscape version of a photo that was cropped to a square the moment it was taken.
It helps to separate two things that sound similar. Whether an iPhone can physically run two cameras at once is a hardware question, answered by the chip and the multi-camera session. Whether the output is portrait or landscape is a completely separate decision, made by whoever designed the app, about the shape of the canvas the two live images get composited into. Dual recording being portrait-only is the second kind of decision, not the first.
The canvas is portrait before a single pixel is drawn
DualCam composites both camera images on the GPU in real time and writes that exact composited frame to the video file — nothing is re-rendered afterwards, so the frame you see in the viewfinder is the frame that ends up in the file. That frame is 1080 pixels wide and either 1920 or 2340 pixels tall: standard 9:16, or a taller canvas sized to fill a modern iPhone screen edge to edge. Both options are portrait. Neither is a rotated version of a landscape canvas — they are the two sizes the canvas is allowed to be.
Because compositing happens live, the width and height are settled the moment recording starts, not derived from how you happen to be holding the phone. Turning the phone on its side does not ask the compositor to switch to a wider canvas; it just changes the angle you are holding a vertical rectangle at.
The layouts are built around a vertical slot, not a rotatable one
Picture-in-picture, split top-and-bottom and split left-and-right each solve a specific problem: fitting a 16:9 camera frame into a portrait canvas, either whole or into half of one. The amount each layout crops from the source image is calculated for that portrait shape specifically — a left-right split trims from the sides, a top-bottom split trims from the top and bottom, and the exact proportions come out of the canvas being taller than it is wide. Turn the target canvas into a landscape rectangle instead, and every one of those crop calculations flips or breaks. It is not that landscape is a small tweak away; it is a different shape of problem for all three layouts at once.
Why portrait-only is not really a limitation for what this is used for
Reaction videos, vlogs shot while narrating what you are pointing at, and two-person interviews recorded on one phone are exactly the situations dual-camera recording is for, and all three are already vertical-native content: they are shot to be watched on a phone, one-handed, usually on a feed that is vertical by default. Building the canvas around that shape is not a compromise made for the app’s convenience — it is the shape the destination actually wants.
If a shot genuinely needs to be landscape
A wide two-camera comparison meant for a horizontal timeline, or footage headed for a screen rather than a phone feed, is a different job than what live-composited dual recording is built for. In that case, a single camera recorded normally in landscape with the stock Camera app — one clean 16:9 frame, no compositing, no crop budget to work around — will usually serve the shot better than forcing a portrait-first tool sideways. Dual camera recording and landscape footage are two different tools for two different kinds of shot, not one tool with a missing setting.
Common follow-up questions
Does turning my iPhone sideways while recording rotate the output?
No. The canvas dimensions are fixed when the compositor is set up, not read from the phone's orientation, so rotating the device only changes how you are holding a vertical frame — it does not make the recording wider.
Can I turn the finished vertical video into a landscape file afterwards?
You can place it inside a landscape frame with bars on the sides, but that adds empty space rather than new picture — the composited canvas was already fixed at recording time, so there is no extra width to reveal.
Is this an iPhone hardware limit or a design choice?
Design. The multi-camera hardware itself is not orientation-specific, but DualCam is built for iPhone in portrait orientation only — it does not run on iPad or in the Simulator — because the canvas, the layouts and their crop math are all designed around a vertical frame from the start.
Want to just do this?
DualCam records the iPhone front and back cameras at the same time and writes one finished MP4 while you shoot. Free, no account, no ads, nothing leaves the phone.