The https://joi.com/generate/videos is an AI tool that creates short videos from a text prompt. Instead of filming or animating manually, you describe a scene—who is in it, where it happens, what the subject does, and what visual style you want—and the system produces a short clip that attempts to match those instructions. Many people call this “text-to-video,” but the practical workflow is closer to prompt-directed scene creation: the tool interprets your words as a production brief and generates a sequence of frames.
This guide explains what the Joi Video Generator is, how to use it step by step, and how to add sound (music, voiceover, and effects). It also includes a table you can use as a quick reference. No hyperlinks are included.
1) What the Joi Video Generator Does (In Practical Terms)
Video generation is harder than image generation because the model must keep things consistent across frames:
- the same face and body proportions
- stable lighting and color
- a coherent background that does not “morph”
- smooth motion (walking, turning, gesturing)
As a result, output quality depends heavily on three factors:
- Prompt clarity (short, complete, not contradictory)
- Constraints (one main action, one stable setting)
- Iteration discipline (change one variable at a time)
If you approach the generator like a film director—short brief, clear action, simple set—you will get better results faster.
2) Step-by-Step: How to Generate a Video
Step 1: Decide the goal of the clip
Pick one clear purpose:
- cinematic portrait
- character walking shot
- short “intro” scene
- anime-style loop
- mood clip (rainy street, calm room, sunset)
Keep it simple. The more complex the story, the more likely you will see artifacts.
Step 2: Choose a character identity (if the tool offers it)
If the interface provides an “AI character” selection, use it when you want:
- the same person across multiple clips
- consistent face, hair, vibe, outfit style
If you do not need continuity, you can generate a generic subject based purely on text.
Step 3: Write a short prompt using a reliable structure
A strong video prompt typically contains:
- Subject (adult character, outfit, key traits)
- Location (setting, time of day)
- Action (one primary movement)
- Style (cinematic realism, anime cel shading, 3D render, etc.)
- Optional camera note (close-up, medium shot, slow push-in)
Example (safe, non-explicit):
“Adult character in a black coat, neon street at night, slow walk toward camera, cinematic lighting, calm confident mood.”
Two rules that significantly improve stability:
- Keep one primary action (“walks,” “turns,” “smiles,” “looks at camera”).
- Keep one stable setting (“studio backdrop,” “quiet café,” “empty street at dusk”).
Step 4: Add a negative prompt (recommended)
Negative prompts tell the generator what to avoid. Use them as quality control, not as a second creative prompt.
Common negatives:
- blurry, low detail
- distorted face
- deformed hands, extra fingers
- text, watermark, logo
- jitter, flicker (if the generator responds to such terms)
Example:
“blurry, low detail, distorted face, deformed hands, extra fingers, text, watermark, logo”
Step 5: Choose format settings (aspect ratio and number of variations)
- Vertical is ideal for phone-first, character-focused clips.
- Square is good for balanced framing and profile-like visuals.
- Horizontal works best for cinematic scenes, but you must include more environment detail.
If you can generate multiple variations in one run, start with 2–4. This lets you compare outcomes efficiently.
Step 6: Generate, review, and iterate
After generation, evaluate each clip on:
- face consistency
- motion smoothness
- background stability
- overall aesthetic match
Iterate by changing one thing at a time:
- adjust one phrase in the prompt
- add or remove one negative term
- switch aspect ratio
- change style preset/model (if available)
This approach prevents “random prompting” and helps you learn what improves results.
3) Table: Controls and Ideal Practices
| Control / Step | What it affects | Why it matters | Best practice |
| Character selection | Identity consistency | Reduces face drift and inconsistent details | Use for a series of clips; optional for one-offs |
| Main prompt | Content and scene direction | Primary driver of output quality | Use subject + location + single action + style |
| Negative prompt | Suppresses defects | Faster quality improvement than rewriting everything | Start small; add only repeated issues |
| Aspect ratio | Composition and framing | Changes how much background you need | Horizontal needs environment detail; vertical favors character focus |
| Number of variations | How many “takes” you get per run | Helps you choose the best result quickly | Start with 2–4 until prompt is stable |
| Style/model (if available) | Rendering aesthetics and motion behavior | Different models can vary in motion stability | Pick one style and stay consistent while refining |
| Iteration method | Improvement speed | Prevents confusion about what changed the outcome | Change one variable per attempt |
| Review and selection | Final quality | Prevents wasting time improving weaker takes | Keep the best “master” clip and refine around it |
4) How to Add Sound (Audio Overlay) to Joi-Generated Videos
Important practical note
Most AI video generators focus on the visual clip first. If there is no built-in audio track control (for example, no “add music,” “voice,” or “sound effects” option inside the generator interface), the standard workflow is:
- generate the video
- export/save it
- add sound in a video editor
That is normal in content production: you separate picture and sound, then mix them.
There are three main audio layers you can add:
- Background music (mood and pacing)
- Voiceover (narration, character speech, commentary)
- Sound effects + ambience (realism and polish)
Method A: Add background music (fast and effective)
- Import the generated video into a video editor (desktop or mobile).
- Add a music track.
- Reduce music volume so it does not overpower the video (especially if you add voice later).
- Add a short fade-in at the start and fade-out at the end.
- Export the final video.
Best practice: match the music tempo to the motion. Slow walking shots tend to feel better with slower, steady rhythm.
Method B: Add voiceover (best for storytelling and “talking” content)
- Write a short script (one idea, 5–20 seconds).
- Record your voice (or generate a voice track using a separate voice tool).
- Import both the video and voice track into your editor.
- Align key phrases to key visual beats.
- Normalize volume so speech remains clear.
- Export.
Tip: If the character is not lip-synced (common in AI video), voiceover narration usually feels more natural than trying to match mouth movement perfectly.
Method C: Add sound effects and ambience (best for realism)
- Add a low “ambience bed” first (city hum, wind, room tone).
- Add effects on key actions (footsteps, cloth movement, door click, glass clink).
- Keep effects subtle; overly loud effects break realism.
- Export.
Even a simple ambience layer can make a silent AI clip feel dramatically more professional.
5) Starter Prompts Designed for Smooth Motion (Safe, Non-Explicit)
Cinematic portrait:
“Adult character, studio backdrop, subtle breathing and gentle head turn, soft cinematic lighting, sharp focus, calm mood.”
City walk:
“Adult character in modern streetwear, neon street at night, slow confident walk, stable background, cinematic look, shallow depth of field.”
Anime loop:
“Adult anime character, clean linework, soft cel shading, warm sunset street, gentle hair movement, friendly expression.”
Minimal interior:
“Adult character sitting in a quiet room, soft window light, small hand gesture, calm atmosphere, stable background.”
6) A Simple Workflow You Can Repeat Every Time
- Choose one subject, one setting, one action.
- Write a short prompt that includes style.
- Add a small negative prompt focused on quality.
- Generate 2–4 variations.
- Pick the best clip.
- Add sound in a video editor (music, voiceover, ambience).
- Save the final prompt as a template and reuse it for consistent results.
If you tell me the style you prefer (realistic, cinematic, anime, 3D) and the format (vertical, square, horizontal), I can write 15 ready-to-copy prompts plus matching negative prompts optimized for stable motion and easy audio layering—still without any hyperlinks.