How to film a job interview practice video with both iPhone cameras
Practicing interview answers alone usually means choosing between two incomplete recordings. Point the phone at your own face and you can review eye contact, pauses, whether you smiled at the right moment — but nothing tells you afterward which question you were even answering, or whether you actually covered every part of it. Prop a printed list of questions next to the phone instead and you get a clear record of what you were meant to say, with no video of how you actually said it. There is no way to line the two up afterward, because there was only ever one recording running at a time.
Recording the front and back cameras at once removes that choice, because there is only one file to begin with. Your face, from the front camera, and whatever the back camera is pointed at — a printed question list, a resume, a clock — land in the same frame at the same instant. Play an answer back once and you already know which question it was, how far you got into it, and how you looked doing it, without holding two recordings up against each other by hand.
Decide what you actually need to see again
Picture-in-picture with your face filling the frame is the layout most people reach for by instinct, and it earns that instinct: your delivery is usually the thing you are actually there to review, and a small window in the corner is enough to glance at which question is on the page without it competing for attention. That small window does not need to be readable at a distance either — its job is to remind you which question you were on, not to double as a teleprompter.
A split, with your face and the question list given roughly equal space, earns its place when the questions themselves are long enough that a glance is not enough — a multi-part behavioural question you want to check you actually answered in full, or a printed page you are timing yourself against. Neither layout is locked in for a whole session: a dual recording that is already rolling can switch between picture-in-picture and split mid-take, and since practicing a set of questions naturally means stopping and starting between them anyway, there is nothing stopping you from trying both across the same afternoon and keeping whichever one you actually look at when you review.
What to put in front of the back camera
A printed question list, a resume you are discussing, or a plain clock are all reasonable things to point the back camera at, and each behaves a little differently once it is squeezed into a corner or a half-frame rather than a full one. Text is the thing worth the most care: a left-and-right split crops roughly a quarter off each side of both source frames to fit a vertical canvas, and a question printed edge to edge on a page is exactly the kind of thing that loses its margins in that crop. Top-and-bottom keeps the full width of both frames, and picture-in-picture with the question list filling the frame avoids the crop altogether, so either is the safer choice when the text itself needs to stay legible rather than just present.
A resume or cover letter held up to the lens has the same problem, and the same fix — keep it in a layout that does not crop the sides, or expect to remember what it said rather than actually read it back.
Why a gesture can look reversed when you watch it back
The front camera portion of a dual recording is mirrored, the same way a bathroom mirror is — left and right swapped, because that is the only way the preview is usable for aiming your own face while you record. It is not a bug and not something a setting turns off: the composited frame you see while filming is the exact frame written to the file, mirroring included, because there is no separate save step that could quietly flip half of it back afterward.
For reviewing eye contact, pacing or whether you smiled, none of this matters — a face does not have a correct reading direction. It does matter if you are someone who tracks which hand you gesture with, or if a watch, ring or piece of writing sits in frame on your side: all of it comes out reversed in the front camera’s half, while anything the back camera sees — a resume held up to it, a question list — reads exactly as it does in real life. If handedness or text on your side matters to what you are checking, that is a reason to keep it in the back camera’s frame rather than the front’s.
Let each question be its own take
A dual-camera recording runs straight through from record to stop, with no way to pause it mid-file and pick the same recording back up later. For practicing a list of questions that is close to the right shape already: answer one question, stop, and start fresh for the next, rather than trying to hold a single long recording together across a whole session.
Every take is kept in DualCam’s built-in library with a thumbnail, so a run of ten practice questions ends up as ten separate clips sitting next to each other, ready to compare — including several attempts at the same question, if that is the one you keep coming back to. Decide which ones earn a rewatch after the fact, rather than scrubbing through one long file trying to find where a particular answer started.
A few settings are worth fixing before the first question
Resolution, the mute switch and the countdown timer all lock the instant a recording starts, because each one changes how the file itself gets built rather than how it looks. Leaving mute off is close to automatic here, since your voice is most of what there is to review, and a 5 or 10 second countdown is worth using so you are already settled and looking at the lens when an answer actually begins, instead of still adjusting your seat on camera.
The front and back cameras also set exposure independently, each reading only its own frame, so a bright window behind you can leave your face reading noticeably dimmer than a question list sitting in the same shot under different light. Tapping your own face in the preview pulls exposure toward you without touching how the back camera’s frame looks, which is the faster fix than moving the whole setup around a room.
Common follow-up questions
Can I record my face and my printed question list in the same take?
Yes — picture-in-picture with your face filling the frame and the questions in a small corner window suits a quick glance at which question you’re on, while a split gives the question list enough space to actually read back if it’s a longer or multi-part question. Both can be switched between takes, or mid-recording, since layout is never locked once you start.
Why do my gestures look reversed when I watch a practice answer back?
The front camera’s half of a dual recording is mirrored, the same convention as a bathroom mirror, because that’s what makes the preview usable for framing your own face while you record. It’s not adjustable — the mirrored frame you see while filming is the exact frame saved to the file. It only affects left/right and text in the front camera’s portion; anything the back camera sees, like a resume or question sheet, is never mirrored.
Can I pause between questions and keep recording into the same file?
No — a dual-camera recording has no mid-file pause. Stop and start a new take for the next question instead, which suits practicing a list naturally: each answer becomes its own clip, saved with a thumbnail in DualCam’s library, so you can compare attempts side by side instead of scrubbing through one long recording.
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.