Seedance produces impressive video, but motion problems happen — warping faces, flickering backgrounds, unnatural movement, or objects that morph between frames. Most of these issues have specific causes and fixes.
This guide covers the most common motion problems, why they happen, and how to fix them by adjusting your prompts and settings.
Quick answer
Most motion problems come from three causes: motion intensity too high, competing movements in the prompt, or poor source image quality. Reduce intensity, simplify the prompt to one clear motion, and use higher-quality source images.
- Your Seedance output has visible motion artifacts.
- Faces distort or backgrounds warp during the video.
- The motion looks unnatural or jittery instead of smooth.
Diagnosing the problem
Before fixing, identify the specific issue. Play the video frame by frame if needed. Common problems fall into distinct categories, and each has a different fix.
| Problem | Looks Like | Likely Cause | Fix |
|---|---|---|---|
| Face warping | Faces distort or melt during motion | High motion intensity + face movement | Reduce intensity, simplify face motion |
| Background flickering | Background textures change between frames | Complex background + camera movement | Use simpler backgrounds, lower intensity |
| Object morphing | Objects change shape during the clip | Competing motion directions | Use single, clear motion direction |
| Jittery motion | Movement is not smooth | Very low motion intensity or short duration | Increase intensity slightly, extend duration |
| Body distortion | Limbs stretch or deform | Complex body movement | Use simpler actions, reference images |
Fixing motion intensity issues
The most common fix is simply reducing motion intensity. High intensity pushes the model to generate more movement than it can maintain consistently.
Start at 25% intensity and increase until you get the desired movement without artifacts. This takes a few iterations but saves time compared to fixing artifacts later.
Simplifying the motion prompt
If your prompt describes multiple competing motions, the model struggles to execute all of them consistently. The result is unpredictable motion and artifacts.
Reduce your prompt to one clear motion: one camera direction, one subject action. Add complexity only after the simple version works cleanly.
- Bad: 'Camera pans right while zooming in, subject turns left and raises hand'
- Good: 'Camera slowly pans right, subject faces forward'
- Then try: 'Camera slowly pans right, subject turns head toward camera'
Improving source images
For image-to-video, source image quality directly affects motion quality. Low-resolution, compressed, or cluttered images produce worse motion because the model has less visual information to work with.
Use the highest resolution source image available. Remove any text or watermarks. Ensure the subject is clearly visible against the background.
When to regenerate vs. refine
Sometimes the issue is not the prompt or settings — it is just a bad generation. Seedance has variability, and some generations are better than others.
If you get artifacts on the first try, regenerate 2-3 times with the same settings before changing anything. If the problem persists across generations, then adjust the prompt or settings.
Worked example: fixing face distortion in a portrait video
A portrait video shows face warping when the subject turns. Fix: reduce motion intensity from 60% to 30%, change prompt from 'subject turns head quickly to the left' to 'subject slowly turns head slightly to the left', and use a higher-resolution source image. Result: smooth, natural head turn without distortion.
Common mistakes
- Increasing motion intensity to try to fix jittery motion (usually makes it worse).
- Adding more detail to the prompt when the issue is prompt complexity.
- Not regenerating before changing settings — sometimes it is just a bad generation.
Step by step: diagnose bad motion in one minute
- Watch the clip at 0.25x speed. Most motion problems are invisible at full speed. Slow it down and the glitch becomes obvious.
- Name the problem in one word. Jitter, warp, drift, stutter, or overshoot. Each has a different fix.
- Check motion intensity first. If it is above 60, drop to 35-45. Most "bad motion" is just too much motion.
- Read your prompt for verbs. "Runs, leaps, spins" all stack. Keep one action verb per clip.
- Shorten the clip. 5 seconds is more stable than 10. Seedance drifts on longer clips — cut and concatenate instead.
- Re-generate with the same prompt. Seedance is non-deterministic. Sometimes the fix is just another seed.
Troubleshooting table
| Symptom | Likely cause | Fix |
|---|---|---|
| Subject jitters frame-to-frame | Motion intensity too high for the scene | Drop intensity to 25-40 for talking heads, 40-60 for walking. |
| Face warps mid-clip | No reference image or unclear face | Add a reference image. Cap motion intensity at 35. |
| Background drifts unrealistically | Camera move not specified | Add "static camera" or "locked camera" to the prompt. |
| Limbs duplicate or merge | Prompt has multiple action verbs | Use one verb. Generate a second clip for the second action. |
For motion intensity reference, see motion intensity 0-100 explained. For the full beginner workflow, read the Seedance beginner tutorial.
When to use something else
For writing better prompts that avoid motion issues, see better prompts for Seedance. For understanding camera movement options, see cinematic camera movement.
Frequently asked questions
Why does Seedance produce warping or melting faces?
Almost always motion intensity set too high for a shot that includes a face. The model is asked to move more than it can keep coherent, so the face distorts. Drop intensity to around 30-35 for face shots and add a reference image so the model has a fixed face to hold on to.
What is the first thing to check when motion looks wrong?
Watch the clip at 0.25x speed and name the problem in one word — jitter, warp, drift, stutter or overshoot. Each has a different fix, and most glitches are invisible at full speed.
Will increasing motion intensity fix jittery movement?
Usually it does the opposite — raising intensity adds more movement, not stability. Jitter is more often caused by too much intensity for the scene, or by a clip that runs too long. Lower the intensity and shorten the clip first.
Why do objects or limbs morph and merge mid-clip?
Competing motion in the prompt. Two or more action verbs force the model to blend movements it cannot reconcile. Keep one action verb per clip and generate a second clip for the second action.
Is it the prompt, or just a bad generation?
Seedance is non-deterministic, so before changing anything, re-generate two or three times with the same settings. If the glitch appears every time it is the prompt or settings; if it clears on a re-roll, it was just an unlucky seed.
How does source image quality affect motion in image-to-video?
Directly. Low-resolution, compressed or cluttered source images give the model less to work with, so motion degrades. Use the highest-resolution source you have, remove text and watermarks, and keep the subject clearly separated from the background.
Related guides on this site
These guides cover prompt writing, camera techniques, and character consistency for Seedance.