The Video Gen Lab

From a written prompt to a moving clip

AI video generators, explained shot by shot

An AI video generator turns a written description into a short moving clip. Here is how that works in practice: writing a prompt the model can follow, directing the shot and the style, and the questions of length, resolution and rights that decide whether a clip can be used.

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From a written prompt to a finished clip

Most generators follow the same order of work. The decisions made inside each step are where the results part ways.

  • Prompt

    Describe the scene

    Subject, setting, action and mood, written plainly. A vague prompt leaves the model to guess, and its guesses lean toward the generic.

  • Shot

    Direct the camera

    Framing, camera movement and pacing can often be asked for in words or set with controls. How closely a tool follows them varies widely.

  • Style

    Set the look

    Lighting, colour, film grain or an animated finish. Some tools accept a reference image to hold one look steady across clips.

  • Review

    Check the clip

    Watch hands, lettering on signs, objects that change shape and motion that drifts. Regenerating or extending a clip is often part of the work.

The shot list: what to settle before you generate

Questions worth answering before a generated clip goes anywhere public.

  • Clip length

    Most generators produce short clips. Longer pieces are built by extending a clip or joining several, and keeping them continuous is the hard part.

  • Resolution and frame rate

    Output size and smoothness differ from tool to tool, and often from plan to plan. Upscaling after generation is common, with uneven results.

  • Camera movement

    Pans, push-ins and orbits can be requested in many tools. Complicated moves are where motion tends to warp.

  • Consistency between shots

    Keeping a character, a product or a location the same from one clip to the next is still one of the hardest requests to meet.

  • Sound

    Some generators add music, effects or speech. Others produce silent clips that need a soundtrack added afterwards.

  • Rights and use

    Licence terms decide whether a clip can appear in an advert, a client project or a product you sell.

Before a generated clip is published

The look of a clip is only half the question. These decide where it can actually run.

  • Who owns the output?

    Terms differ on ownership and commercial use, and free plans can carry stricter conditions than paid ones.

  • Does it need a label?

    Some platforms and advertisers ask for generated or altered video to be disclosed. Check the rules where the clip will run.

  • Could it resemble a real person or work?

    A prompt naming a person, a brand or an artist's style can produce a clip you are not free to use.

Articles on each of these questions are on the way.

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What readers ask

What this site sets out to answer

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