Cropping to vertical without losing the subject
Which third of the width survives is a decision, and the automatic crop that makes it for you does not know which part of the frame is the lesson.
You filmed it wide, because that is how the camera came out of the bag. Now you want it vertical, and the editing software has a button for exactly that: it tracks your subject and keyframes the crop for you, which is better than it sounds and still a guess.
Then you watch it back. It followed your face while the thing you were pointing at drifted out of shot, your hands leave the frame every time you gesture, and it is subtly wrong in a way you cannot name at once. Nothing is wrong with the file. The framing simply belongs to a different video.
The crop is not free, and the part it spends is the part you were composing with.
Why does the crop go wrong so often?
A vertical frame cut out of a widescreen one, keeping the full height, keeps somewhere near a third of the width. That is geometry rather than opinion, and it is the whole problem in one number. Two thirds of what you framed is gone, and the tool decides which third survives by guessing where you are, which it does well for a face and poorly for the point of the lesson.
Now think about where you actually sit in your own wide shots. Off to one side, most likely, with the worktop, the instrument, the whiteboard or the product filling the other half. That composition was correct. A wide frame wants the subject off centre with something to look into. All of that intention lives in the two thirds the crop throws away.
And even if you were dead centre when you started, you did not stay there. You leaned in to reach something, you turned towards the second camera, you stood up. A crop left entirely to the tool is a camera with an operator who cannot tell your hands from your head, and viewers notice an unoperated camera long before they can name what is bothering them.
Should you crop the horizontal edit, or start again?
Start again, in a new sequence, at vertical dimensions, and bring the clips into that.
Cropping the finished horizontal edit sounds like the fast route and it is the slow one, because a finished edit carries decisions made for a shape you are about to abandon. Titles sized to be read across a wide frame. A caption block sitting along the bottom, where a phone puts the platform's own buttons. A graphic keyed to the right-hand third, which no longer exists. Cuts paced for eyes scanning a wide image rather than one narrow column.
Build the vertical version as its own thing and none of that comes with it. Each clip gets placed, scaled and positioned for the frame it is actually in. Text gets set at a size that survives a phone held at arm's length. The part of the picture that matters sits where a thumb is not covering it.
Where should the frame sit when the subject moves?
On the subject, not in the middle.
The habit worth building is to treat the vertical frame as a camera operator you have just hired. Where would a person holding this camera point it? At the face while you are talking. At the hands while you are demonstrating. Slightly ahead of you when you move, so there is somewhere to walk into, rather than pinned to the back of your head.
In practice that means setting the position of the crop at the start of a clip, setting it again where the action moves, and letting the software travel between the two. Most editing tools do this with two position keyframes and nothing else, and the automatic reframer is doing the same thing without asking you which part matters.
Two cautions. Do not chase every small movement, because a frame that twitches with a shoulder reads as nervous. And when the hands are the lesson, the hands win over the face, even mid-sentence.
Why export a master with no text on it?
Because a version with words burned into the picture can only ever be that version.
A text-free master is the same finished cut, graded and mixed, with subtitles, titles and lower thirds left off. Once it exists, a second language version is a text pass rather than a rebuild. A still for a thumbnail comes off it clean. You, or a platform, or somebody working on this in a year, can re-caption it without the old words showing through underneath.
This is where a habit earns more than a technique. In this studio a vertical cut is built as its own sequence, with every clip reframed and rescaled into it, the crop following the subject rather than sitting still, and the text-free master is exported before anybody types a word on screen. It costs one extra export and it removes a whole category of rework.
Film knowing the crop is coming
The cheapest fix happens before the camera runs, and it costs nothing at all.
- Leave headroom you are willing to lose, because a tight wide shot becomes a claustrophobic tall one.
- Keep the action off the far left and the far right. If you reach for something at the edge of a wide frame, it does not exist vertically.
- Stand roughly where you stood last time. Tape on the floor is the entire system.
- If a demonstration matters, do it once with your body square to the camera, even if you have already done it at an angle. That is the take the vertical version will use.
None of this makes the wide version worse. It stops the vertical version being a rescue.
What to change on the next one
Take a video you have already published wide and rebuild it vertically from the sequence up, rather than cropping it. It costs an evening, and it will show you which of your framing habits survive the narrower frame and which ones you have been getting away with.
The decision after that is not a technical one. It is whether the vertical version is a copy of the video or a piece of work in its own right, and that question has a different answer.
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