How to film a knitting or crochet video with both iPhone cameras
A knit-along or crochet-along works on the same trade as most ambient hobby video: someone puts in a real, unhurried stretch of hands-on work, and a viewer gets to sit with it rather than watch a tutorial. That only holds together if the hands doing the stitches and the face talking through the pattern, the yarn choice or nothing in particular land in the same frame at the same time — recording them as two separate clips and lining them up afterward turns a low-key sitting into an editing chore, which defeats the point of a genre whose whole appeal is that nothing about it feels produced.
A dual-camera recording removes that lining-up step by never creating two files to begin with. What is different about knitting and crochet next to most other things people point a phone at is not the camera settings — it is the room. There is usually no desk, no overhead lamp already in place, and a project that looks nothing like it did three sittings ago. The setup below follows from that.
A lap is not a desk: where the phone actually goes
Most craft or hobby setups assume a flat surface at a fixed height and a light already pointed roughly the right way — a desk, a kitchen counter, a workbench. Knitting and crochet are usually worked from a lap, on a couch or an armchair, often with no table within reach at all, so the phone needs its own support rather than borrowing one that happens to be nearby. A tripod with an extendable centre column stood beside the chair, angled down at roughly chest height, does the job a desk would otherwise do. A phone clamp clipped to a shelf or the top of a bookcase and aimed down works just as well if there is nowhere to put a tripod’s feet.
The motion itself is smaller and steadier than most craft work — no glue gun or scissors sweeping across the frame — but the working hand still lifts every few stitches, pulling yarn taut or drawing a hook back through a loop. Frame with headroom above the hands rather than cropping in tight to them, so that lift does not clip the top of the shot on a regular, distracting cycle. It is a different failure mode from a hand sweeping sideways across a desk shot, and it is worth checking for in the preview — which is the same frame that gets recorded — before you settle into the first few rows.
The click of the needles or hook is part of the sound, not something to fight
DualCam writes one audio track, not one per camera, from a single mono microphone near the bottom edge of the phone. For most video that is a plain fact about how the sound gets captured; for knitting and crochet it matters more than usual, because the rhythmic click of needles or a hook is often something people are filming for on purpose, the same way the sound of pages turning matters in a reading video. There is no separate channel for it to sit on, so whatever the one microphone picks up is the whole sound.
Cozy setups work against that more than a bare desk does. A blanket over the lap, a cushion behind the stand, a throw draped near the phone — all normal for a knitting session, and all capable of pressing right up against the microphone opening rather than just softening the room around it. That is a different problem from the usual advice about hard rooms sounding worse than soft ones: a soft room helps by cutting echo, but fabric touching the phone itself muffles the one microphone directly. Leave the last inch of the bottom edge in open air, and if you are narrating over the clicking, keep the phone roughly as close to your voice as it is to your hands — one mono track cannot rebalance the two afterward.
As the project grows, the frame has to grow with it
A cast-on row or a small swatch fits close, and getting close is genuinely useful early on — an ultra wide back lens, where the iPhone offers one, focuses much nearer than a main lens and is the same physical lens the stock Camera app’s macro mode borrows automatically for single-camera shots. A multi-camera session does not make that switch on its own, so picking ultra wide by hand is how a dual recording gets a comparably close view of stitches early in a project.
A blanket, a sweater body or a long scarf does not stay that size. By the tenth sitting the same project can cover most of a lap, and a frame set for a swatch starts cropping the edges of the piece rather than showing it. Because the back lens locks in for the whole take the same way resolution does, this is not something to fix mid-sitting — check the current width of the project against the edges of the preview before you start each session, and pull the stand back or step down from ultra wide to the main lens once the piece has outgrown the close view that suited it at the start.
A knit-along is many sittings, not one long recording
A single sitting can run long — an hour is not unusual for a proper knit-along episode — and a dual-camera recording has no pause button partway through one: the file writes continuously from the moment it opens until you stop it. That is not really a limitation here, because knitting and crochet already come with a natural stopping point built in — you put the work down, or you get up — and each of those is exactly where a take should end anyway.
At DualCam’s recording bitrate, roughly 75 MB a minute regardless of whether you shoot at 720p or 1080p, a ninety-minute sitting comes to a little under 7 GB, and it will sit on the phone twice if you save it to Photos without deleting the app’s own copy afterward. The same long, continuous take is also the kind that runs a phone hottest — worth taking the case off before a long sitting, and treating the same break where you put the needles down as a break for the phone too, rather than one where it keeps recording on your lap.
Common follow-up questions
Can I move the phone or change the picture-in-picture corner if the yarn shifts partway through a sitting?
Yes. Layout, the picture-in-picture corner, its size and shape can all be changed while DualCam is recording, and the file follows instantly because the preview and the recording are the same rendered frame. Only the back lens, resolution, mute and the countdown lock in at the start of a take.
Do I need an external microphone to pick up the needle or hook sound clearly?
Not necessarily. DualCam records from whatever iOS has set as the default audio input, so a connected and selected wired or Bluetooth microphone is used automatically. Without one, the built-in mono microphone near the bottom edge is what captures the clicking, which is why keeping that edge clear of blankets and cushions matters more here than in most videos.
How much storage does a long knit-along sitting use?
Roughly 75 MB a minute at DualCam’s recording bitrate, so an hour comes to a little over 4 GB and a ninety-minute sitting to a little under 7 GB — the same regardless of whether you record at 720p or 1080p. That number doubles until you delete the app’s own copy of a take you have already saved to Photos.
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.