How to Use AI Video Generator

What You'll Learn

• How to plan an AI video before opening a generator
• How text-to-video and image-to-video prompts differ
• How to manage motion, references, dialogue, and short multi-shot scenes
• How to review output, protect rights, and export a usable asset

How to Use AI Video Generator tools is easier when the task is treated like a small production brief rather than a magic command. You define what the viewer should see, select a tool that supports the required input, write a prompt with visible actions, generate a short draft, inspect the result, and then make a controlled revision. That cycle works across many platforms even though the buttons, models, plans, and output limits differ.

This guide is checked against official Runway, Kling, and OpenAI documentation available on August 21, 2026. It does not promise perfect character continuity, automatic lip sync, guaranteed resolution, or a universal best generator. Provider documentation and account limits can change, so open the official tool page before uploading material or paying for credits.

For related background, read the site's AI image generator guide, the Runway and Kling comparison, and the AI video tools update. Those pages provide context, but the current provider documentation remains the source of truth for buttons and limits.

How the AI Video Workflow Works

A beginner workflow has seven practical stages. First, decide the viewer, message, and delivery format. Second, choose text-to-video or image-to-video based on how much visual control you need. Third, write a short shot prompt. Fourth, set parameters such as aspect ratio, duration, and resolution in the tool rather than trying to force them through prose. Fifth, generate a draft. Sixth, inspect the motion, identity, audio, text, and background. Seventh, revise one variable and export only after the result passes the review.

The point of a staged workflow is not to make every result predictable. Generators still produce variations. A shot log helps you remember which prompt, reference, setting, and output produced a useful result. It also makes a later edit easier because you can change one part without losing the working parts of the scene.

Keep a local copy of the prompt and the source files. If the project uses a public figure, a customer, a private recording, copyrighted music, or a brand logo, record why you have permission to use it. A polished output can still create a rights problem if its source material was not cleared.

Set Your Goal, Audience, and Format

Start by writing one sentence about the intended video. For example, “A short product teaser shows a reusable bottle on a desk as morning light crosses the label.” This sentence identifies the subject, the action, and the reason for the shot. A tutorial, an advertisement, a social clip, and a film concept may need different pacing, framing, and disclosure.

Choose the destination before generating. A vertical mobile clip needs a different composition from a wide presentation video. Leave enough space for captions if the final platform overlays text. Decide whether the first output is a visual test, a final asset, or one shot that will later be edited with other shots.

Tool settings control some properties that prose cannot override. OpenAI's Sora 2 guide says that model, size, seconds, and character references are API parameters. Runway's Gen-4.5 guide provides separate settings for aspect ratio, duration, and frame rate. The prompt should describe the scene and movement while the interface or API sets the container.

Before generating, write down the target format, approximate length, audio requirement, reference requirement, and acceptable output quality. This small checklist prevents a common mistake where the creator spends credits on a visually attractive clip that cannot fit the intended edit.

Choose the Right Tool for the Job

Do not choose a generator only because a video on social media looks impressive. Check the current documentation for supported inputs, duration, output resolution, audio, reference images, safety rules, and plan access. A tool may be strong at a particular workflow while offering a different control set from the one described in an older tutorial.

Runway's official Gen-4.5 guide documents Text to Video and Image to Video control. Kling's official VIDEO 3.0 guide documents multi-shot generation, element reference, Native Audio, and up to 15 seconds of continuous video. OpenAI's Sora 2 guide documents prompt-based generation, image inputs, character references, editing, and extension. These examples show why tool selection should follow the job.

A tool name in a guide does not mean that every reader has the same plan or interface. Sign in through the provider's official site, read the current plan page, and check whether a feature is available in your country and account type. Do not purchase a reseller account just to reach a button that may be removed later.

Learn the Basic AI Video Prompt Anatomy

A useful video prompt reads like a brief for a cinematographer. Start with the subject and setting, then describe one main action. Add the camera framing or movement, lighting and palette, sound or dialogue, and any constraint that protects the shot. Clear visible language is more useful than abstract instructions such as “make it perfect” or “make it cinematic.”

Use one main camera move and one clear subject action when learning. If a shot includes a person walking, a vehicle turning, a weather change, a camera orbit, and a long dialogue exchange, the generator may struggle to keep all beats aligned. Split the idea into separate shots when the action becomes crowded.

OpenAI's Sora 2 guide recommends describing the camera, action, lighting, and mood. It also notes that detailed prompts give more control while lighter prompts allow more variation. The right level depends on the project. Keep the distinctive details that matter and leave minor choices open when creative variation is welcome.

Start with Text-to-Video

Text-to-video is useful for testing a concept when you do not yet have a reference image. It can create a mood test, a location idea, a simple establishing shot, or a rough visual for a storyboard. Begin with a short, self-contained shot rather than a full film synopsis.

Runway's Gen-4.5 guide says Text to Video prompts should describe both visual elements and motion. Sora's guide explains that the prompt controls the content while parameters control model, size, seconds, and character references. The same principle applies broadly: write the visible scene in the prompt and set technical properties in the interface or API.

Generate a first draft with a simple action. Inspect whether the subject is visible, the action is legible, and the camera move supports the message. If the result fails, change only one thing, such as the action verb, camera distance, or lighting. A large rewrite makes it difficult to know which change helped.

Short clips are a practical starting point because they make mistakes easier to locate. OpenAI's guide says shorter videos are often followed more reliably and suggests that two 4-second clips may work better than one 8-second clip for some projects. This is guidance, not a guarantee. The correct length depends on the scene and the tool.

Use Image-to-Video References Carefully

Image-to-video is useful when composition, wardrobe, product shape, or a starting frame matters. Upload a reference that you have the right to use, then prompt the movement that should happen after the reference frame. Runway's Gen-4.5 guide says Image to Video prompts should focus on motion. OpenAI's Sora guide says an image input can anchor composition and style and must match the target video resolution.

References improve control but do not guarantee that a face, garment, logo, or object will remain identical. Check for changes in hands, text, reflections, background details, and body proportions. If a product label matters, consider adding final text in an editor instead of relying on generated lettering.

Keep the same reference and the same core description when creating a recurring character. Save the approved reference with the prompt and generation date. Kling VIDEO 3.0 documentation describes element reference and a `Bind Subject to Enhance Consistency` control, while Runway Gen-4 describes visual references for consistent subjects and locations. These controls can help, but the final output still needs review.

For Sora 2, the official guide lists JPEG, PNG, and WebP image inputs and says the input image must match the target resolution. It also says character references can be used for up to 2 uploaded characters in one generation. These are documented product parameters, not a reason to upload private or unlicensed material.

Plan Motion and Timing

Describe motion as a visible sequence. Say who moves, what moves, where the camera moves, and when the action changes. “A cyclist rides quickly” is less useful than “The cyclist pedals three times, brakes at the crosswalk, and turns toward the shop.” Small beats give the model a clearer target, although the result may still vary.

Use one main camera move whenever possible. A slow push, a lateral track, a tilt, or a locked camera can each support a different mood. If the character and the camera both move quickly, simplify the background and reduce the number of actions. When a shot misfires, freeze the camera or remove a secondary action before adding more detail.

Timing can be written as beats rather than rigid claims. For example, describe an object entering the frame, pausing, and leaving during the final moment. Do not assume that an instruction such as “at 4 seconds” will be obeyed unless the chosen tool documents that level of control.

Motion quality is not the same as realism. Look for foot placement, object contact, acceleration, shadows, reflections, and the relationship between camera movement and subject movement. A visually impressive frame can still fail when played as a sequence.

Build Multi-Shot Videos with a Shot Plan

Longer stories are often easier to manage as short shots. Create a shot log with a number, setting, subject, action, camera, reference, audio, and review note. Keep the subject description and lighting logic consistent across shots. This makes it easier to regenerate one weak shot without changing the whole sequence.

Kling VIDEO 3.0 documents Multi-Shot and Custom Multi-Shot modes. The guide says Multi-Shot can plan transitions and shot framing from a prompt, while Custom Multi-Shot lets the creator specify the content and duration of each shot. It also says that the model may choose a single shot when the described scene suits one shot better. That is why a plan should be treated as guidance rather than a promise of exact coverage.

Sora 2 can also be used in a short-clip workflow. Its official prompting guide documents supported seconds values of 4, 8, 12, 16, and 20, plus extensions using the original clip as context. A project may still be easier to edit when each clip has one clear action.

Use a simple shot list before generating:

Use a shot log with the subject and setting, one clear action, the camera and light, the approved reference, and the audio choice. Recording those fields makes it easier to regenerate a weak shot without changing the rest of the sequence.

Add Dialogue and Audio Safely

Audio is a separate review problem. Keep dialogue short, label each speaker, and match the number of spoken words to the clip length. OpenAI's Sora guide recommends concise dialogue and consistent speaker labels for multi-character scenes. It also suggests using a small sound cue when a shot is silent rather than forcing a full soundtrack into a short clip.

Kling VIDEO 3.0 documentation describes Native Audio with character-linked speech, multi-character dialogue, language support for Chinese, English, Japanese, Korean, and Spanish, and dialect or accent controls. This is a feature description from Kling's guide. It does not guarantee pronunciation, emotional delivery, lip movement, or accent quality for every prompt.

Review names, numbers, pronunciation, pauses, speaker assignment, background noise, and music rights. If the spoken line is important, create a clean version with no dialogue and add recorded or licensed audio during editing. This gives the creator more control over the final mix.

Do not clone a real person's voice or appearance without permission. Treat a voice or face reference as sensitive personal material. Follow the provider's current policies and local law before creating a synthetic performance.

Review Quality and Iterate One Change at a Time

Watch the result more than once. The first pass should check whether the subject and action are visible. The second should check motion, face and hand stability, background continuity, camera behavior, text, logos, and contact with surfaces. The third should check audio, consent, source rights, and whether the export fits the intended destination.

Runway's Gen-4.5 guide recommends generating and iterating with prompt adjustments. OpenAI's Sora guide gives the same practical principle: make a controlled change, keep what already works, and simplify a shot if it keeps failing. Avoid changing the prompt, reference, duration, and camera at the same time.

Keep failed drafts when they explain what went wrong. A short note such as “hands changed during turn” or “dialogue too long for clip” is more useful than a vague score. Review is part of production, not evidence that the generator has failed completely.

Consent, Copyright, and Personal Safety

Only upload images, videos, audio, logos, music, and locations that you have the right to use. If the source shows a real person, obtain appropriate permission before generating a synthetic performance or a reusable character. Do not use a private recording simply because the software accepts the file.

Generated content can resemble existing people, brands, or works even when the prompt was original. Check the output before publication. Remove or replace accidental logos, personal details, copyrighted characters, and misleading claims. If the video is an advertisement, label material and claims according to the rules that apply to the campaign.

Do not describe a provider feature as permission to make a digital twin. OpenAI's Sora 2 guide discusses character references for uploaded characters, while Kling documents element references. Neither source makes consent optional. A technical control can help maintain appearance, but it does not grant ownership or permission.

Keep private source files out of public prompt libraries and shared workspaces. Review retention, training, account, and deletion terms for the chosen service. If you are working for a company or client, use the account type and approval process required by that organisation.

Export, Label, and Publish the Result

Before export, check the tool's current resolution, aspect ratio, duration, frame rate, watermark, credits, and plan conditions. Runway's Gen-4.5 guide documents 720p output, 24 or 25 FPS, and durations from 2 to 10 seconds. Its text-to-video row lists 16:9 at 1280x720, while its image-to-video row lists additional aspect ratios.

Kling VIDEO 3.0's official guide documents flexible duration from 3 to 15 seconds and output up to 15 seconds. OpenAI's Sora 2 guide documents seconds values of 4, 8, 12, 16, and 20, higher-resolution exports up to 1920x1080 or 1080x1920, and extensions up to 6 times for a total of 120 seconds. These figures describe the reviewed documentation and can change.

Export the format required by the destination, then watch the downloaded file rather than assuming the preview is identical. Check that captions, audio, colour, frame rate, and crop are correct. Keep a file name that records the project, shot, version, and date. Save the prompt, reference source, and permission note with the asset.

If the video is synthetic or materially altered, consider a clear label when the audience could reasonably misunderstand what they are seeing. Disclose sponsored or promotional content where required. The last step is not pressing download. It is confirming that the asset is technically usable, legally supportable, and honestly presented.

For broader AI production context, read the site's commercial AI image safety guide, the AI browser analysis, and the agentic AI explainer. The official documentation linked in this article should be checked again for the latest video controls.

Official references used for this guide are the Runway Gen-4 research page, the Runway Gen-4.5 guide, the Kling VIDEO 3.0 user guide, and the OpenAI Sora 2 prompting guide. Check these pages again because tools and limits change.