Every AI video creator knows the moment: a clip looks perfect for two seconds, then a hand melts, a face slides or the background starts to boil. These artifacts are normal, and most have predictable causes. This guide explains the common ones, why they happen and what actually fixes them.
A general approach
Before fixing a specific artifact, run through four questions:
- Is the prompt asking for too much? Multiple actions, complex interactions or big camera moves cause most problems.
- Is the clip too long? Errors build up over time. Shorter clips are cleaner.
- Is the resolution right for the model? Generating far above or below the model’s native resolution creates odd results.
- Is it just a bad seed? Try three or four seeds before changing anything else.
Fixing these basics resolves most artifacts. The rest need targeted fixes.
Flicker
What it looks like: brightness, colour or texture changes rapidly from frame to frame.
Causes: strong style transfer in video-to-video, high denoise strength, upscaling frames independently, low step counts.
Fixes: lower denoise strength; use a video-aware upscaler rather than an image upscaler; increase steps slightly; apply a deflicker filter in your editor; add light film grain to mask small variations.
Warping and morphing
What it looks like: objects bend, stretch or change shape; a car turns into a different car; a building melts.
Causes: too much motion, fast camera moves, objects the model rarely saw, long clips.
Fixes: add “slow, subtle movement”; use a static or gentle camera; shorten the clip; use image-to-video so the object’s shape is fixed in the first frame; lower motion strength.
Melting or extra fingers
What it looks like: hands with six fingers, fingers merging, hands dissolving while moving.
Causes: hands are small, complex and move fast; models still struggle with them.
Fixes: avoid prompts focused on detailed hand actions; frame hands out of shot or keep them still; use a negative prompt for “deformed hands, extra fingers”; generate close-ups of hands from a clean reference image; cut away before the hand motion completes. Sometimes the best fix is editorial: choose a different angle.
Drifting faces
What it looks like: a character’s face gradually changes during the clip, especially when turning.
Causes: head rotation, small faces in wide shots, long clips.
Fixes: start from a clear front-facing reference; avoid big head turns within one shot; keep faces reasonably large in frame; shorten the clip; use a character LoRA for long projects. See Keeping Characters Consistent.
Background boiling
What it looks like: textures in the background crawl or shimmer, as if alive.
Causes: detailed backgrounds such as foliage, crowds or patterned walls, combined with camera movement.
Fixes: use shallow depth of field (“blurred background”); simplify the setting; add fog or haze; lower camera movement; use a static camera.
Objects appearing or disappearing
What it looks like: a cup vanishes from a table, a second person walks in from nowhere.
Causes: the model does not track objects reliably over time, especially when they are partly hidden.
Fixes: keep important objects clearly visible throughout; avoid characters walking behind objects; use image-to-video with first and last frames to anchor the start and end; cut the clip before the error appears.
Frozen or nearly static clips
What it looks like: almost no motion, like a still image with a slight wobble.
Causes: prompts without clear motion verbs; low motion strength; some image-to-video settings that favour stability.
Fixes: describe motion explicitly; raise motion strength gradually; add a camera move; include environmental motion such as wind, water or people in the background.
Unnatural speed
What it looks like: people moving in slow motion or fast-forward, or water flowing oddly.
Causes: frame rate mismatch between generation and export; prompts with speed words; the model’s training habits.
Fixes: export at the frame rate the model was designed for; add “real-time speed” or “slow motion” deliberately; adjust speed in your editor; use frame interpolation for smoother slow motion.
Garbled text and logos
What it looks like: signs with nonsense letters, wobbly logos.
Fixes: keep text out of the generated scene (“no text, no signs” in the negative prompt) and add titles, signs and logos in your editor. For signs that must appear in the world, composite them on afterwards with tracking.
Colour shifts and over-saturation
What it looks like: colours intensify, shift hue or become harsh during the clip.
Causes: guidance too high; mismatched VAE; long clips.
Fixes: lower the guidance scale; use the correct VAE for the model; colour-correct in the editor.
Seams when extending clips
What it looks like: a visible jump when one clip continues from another’s last frame.
Fixes: use the exact last frame at full quality; keep prompts and settings the same; add a short crossfade or cut on movement; hide transitions with a cutaway shot.
When to stop fixing
Sometimes the fastest fix is to change the shot. If a hand interaction fails after ten tries, show the result of the action instead of the action itself, or film that moment from behind. Experienced editors design around a tool’s weaknesses rather than fighting them endlessly. That mindset saves more time than any setting.
A quick diagnosis table
| Artifact | First thing to try |
|---|---|
| Flicker | Lower denoise, video-aware upscaling |
| Warping | Slower motion, shorter clip |
| Bad hands | Hide or still the hands |
| Drifting face | Front-facing reference, no head turn |
| Boiling background | Shallow depth of field, fog |
| Frozen clip | Explicit motion verbs |
| Garbled text | Add text in the editor |
| Harsh colours | Lower guidance |
Prevention beats repair
Most artifacts can be avoided at the planning stage. Short shots, one action each, clear subjects, gentle camera moves and image-to-video for anything that must look specific will prevent the majority of problems before they appear.
Frequently asked questions
Will future models fix all artifacts?
They keep improving, but complex motion and fine detail will likely remain challenging for some time.
Can an upscaler remove artifacts?
It can soften small flicker, but it usually sharpens structural errors. Fix generation first.
Is it better to regenerate or edit?
Regenerate for structural problems, edit for colour, speed and small flicker.
