Resuming a shoot after a break
Continuity is what decides whether the two halves of your video sit next to each other.
You film the first half in the morning, break for lunch, come back and film the rest. In the edit the two halves refuse to go together. The light has gone warmer, your fringe has moved, and the camera is looking at you from very slightly further left than it was.
None of that was visible in the room. All of it is obvious on a cut, because a cut puts two moments side by side and invites a comparison nobody makes while filming. So photograph the setup before you stop. The rest of this is a list of what to compare it against.
Why does a break show up on a cut?
The eye is not measuring anything. It is registering difference at a boundary.
Two frames a second apart, one warm and one cool, read as an error to somebody who could not tell you what changed. What they feel is that something is wrong, and it lands on the video rather than on the light. A film set has somebody whose whole job is this. You have a camera on a tripod and a sandwich going cold.
What to photograph before you walk away
Three photographs on your phone, taken before you stop rather than after you come back.
One from behind the camera, showing the whole frame including the background. One of yourself, arms down, from the front. One of the room from the side, showing where the camera and the light stand in relation to you.
That is fifteen seconds of work, and it converts every check below from memory into comparison. Leave the tripod alone, and if the floor allows, tape under each leg and under your chair.
What has moved while you were gone?
A cooking partner's pre-shoot list led with exactly this. Five things move while you are away, and not one of them announces itself.
The light
The sun, mostly. If any part of your light comes through a window, its direction and its colour have both moved while you ate, far enough over a couple of hours to see. Either close the curtain and work on artificial light so the room stops depending on the weather, or accept the shift and structure the video so the halves never touch.
Check too whether a lamp has come on somewhere: a hallway light somebody flicked on their way past is now part of your setup.
You
Hair is the usual offender, the front more than the back. Compare against the photograph rather than the mirror, because the camera sees you the other way round from how you see yourself.
Then clothing, which ends an edit rather than complicating it. A jumper taken off after lunch means the halves cannot cut together at all. Then the small things: glasses on or off, sleeves rolled or down, jewellery removed to wash up.
The camera
Nudged by a knee, or the tripod head has crept downwards under the weight, which is what they do. Compare the frame against the photograph before anything else.
Then check the camera has not made decisions for you. Some return to automatic exposure and automatic white balance when switched off and on. White balance is the camera's decision about what counts as white in the room, which sets how warm or cool everything else looks, so a camera that has quietly reassessed it hands you two halves in two colours.
The levels
Level is the recording volume: how loudly the microphone writes into the file. If the dial moved, or the recorder came back at its default, the second half is a different loudness.
Reclipping matters as much as the dial. A small microphone unclipped for lunch goes back in the same place, on the same layer of clothing, at the same distance from your mouth. A few centimetres changes the tone as well as the volume, and tone cannot be dialled back afterwards.
The room behind you
A chair has moved. A cup has appeared. A door that was shut is open, with a corridor behind your head. The background is the part nobody photographs and the part the viewer looks at throughout.
Why can nobody see this at the time?
Because your eyes are doing you a favour.
Vision corrects for colour continuously. Walk from a warm room into daylight and within a minute the difference stops registering, which is useful for living and fatal for filming. The camera never adjusts unless told to, and never gets used to anything.
The rest is attention. While filming you are watching whether you said the words right, not whether the plant behind you has moved, which is the argument for a checklist rather than for concentrating harder.
What if the two halves already do not match?
Some of it comes back and some does not.
Colour comes back up to a point: a grade pulls the second half towards the first, and the further apart they started, the more the fix shows. Framing comes back within limits, by punching in, which is a digital zoom and costs a little sharpness. Loudness comes back easily; tone does not.
Wardrobe and hair do not come back, and nothing in post-production changes what you were wearing. So do not spend a day trying. Restructure instead: keep the halves apart, lay b-roll across the seam, or make the break deliberate with a title card, which reads as a chapter rather than a mistake.
Five minutes that decide the edit
There is a version where you never bother, because you have filmed in the same room a hundred times and nothing has ever moved. Then one afternoon the window is open, the light is bouncing off a white van outside, and you find out six weeks later with a deadline.
Take the photographs. They are the only part of this that still works on the day you forget to do everything else.
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