Three settings decide how your iPhone footage looks and how much space it eats: resolution, frame rate, and codec. Get them right and you get sharp, flexible footage without filling your phone. Here's how to choose each one as a creator.
Resolution: 4K vs 1080p
4K packs four times the detail of 1080p. It's the right call when you might crop, reframe, or capture multiple aspect ratios — for example saving a vertical and a horizontal file from one take, where you want room to punch in without softening the image. 1080p is lighter on storage and perfectly fine for quick clips that stay full-frame and won't be cropped.
Frame rate: 30fps vs 60fps
- 30fps — natural, cinematic motion. Great for talking-head, interviews, and vlogs.
- 60fps — smoother motion and clean slow-motion in post. Ideal for sports, action, and gaming.
A useful rule: if the subject moves fast or you plan to slow it down in editing, shoot 60fps; if it's mostly talking or static, 30fps looks more filmic and saves space.
Codec: HEVC vs H.264
HEVC (H.265) produces roughly half the file size of H.264 at the same quality — the best default for modern devices. Use H.264 only when you need maximum compatibility with older software, older PCs, or a platform that chokes on HEVC. Every iPhone that supports Multi-Cam also encodes HEVC efficiently in hardware, so there's rarely a reason not to use it.
Bitrate: the setting behind the settings
Resolution and frame rate get the attention, but bitrate — how much data per second the encoder writes — is what actually determines clarity in fast motion. Higher bitrate means fewer compression artifacts in busy scenes (crowds, water, foliage) but larger files. HEVC reaches the same visual quality at a lower bitrate than H.264, which is why it saves so much space. You don't usually set bitrate by hand; choosing 4K + 60fps + HEVC gives you a high, well-tuned bitrate automatically.
File-size trade-offs (approximate, 1 minute)
| Setting | Codec | Approx. size / min |
|---|---|---|
| 1080p · 30fps | HEVC | ~60 MB |
| 1080p · 60fps | HEVC | ~90 MB |
| 4K · 30fps | HEVC | ~170 MB |
| 4K · 60fps | HEVC | ~400 MB |
Sizes are rough estimates; H.264 roughly doubles them.
Storage planning: how much fits
Those per-minute numbers add up fast at 4K·60fps — roughly 24 GB per hour in HEVC. On a 128 GB iPhone with, say, 60 GB free, that's about 2.5 hours of 4K·60fps footage. If you record two streams (front + back) or two aspect ratios at once, plan for proportionally more. Before a long shoot, clear space or step down to 4K·30fps to roughly halve the data rate.
Battery and heat at 4K·60fps
The highest settings work the chip and the storage hardest, so long 4K·60fps takes drain the battery faster and can warm the phone. For extended sessions, keep the device out of direct sun, remove a thick case, and consider 4K·30fps to reduce load. For most short-form clips the heat never becomes an issue.
Recommended settings by use case
- Short-form / social: 4K · 30fps · HEVC — sharp, croppable, manageable size.
- Action / sports: 4K · 60fps · HEVC — smooth motion and slow-mo headroom.
- Quick clips / limited storage: 1080p · 30fps · HEVC.
Dial these in inside DualCam
DualCam's Pro Settings give you full control over resolution (up to 4K), frame rate (up to 60fps), and codec (HEVC or H.264) — while still saving both a vertical and horizontal file from a single take.
Download on the App StorePair the right settings with the right shape — see our guide to vertical vs horizontal video.