Create Slow Mo Videos Using AI Models
Generate smooth slow mo videos at 120 fps or higher with Veo 3.1 and Kling 3.0. Skip manual interpolation limits and produce 8-second 1080p clips without jitter on Flixly.
TL;DR
Flixly routes slow-mo requests to Seedance 2.0, Veo 3.1, and Kling 3.0. These models convert 4-second 24 fps clips into 6- to 10-second sequences at 120-240 fps while preserving motion accuracy. Credit costs range from 15 to 32 per generation. Desktop optical flow tools stop at 120 fps before artifacts appear. The workflow uses two passes: base generation followed by temporal upscale.
A 10-second 24 fps clip collapses to 2.4 seconds at 240 fps without frame interpolation, leaving creators with stuttered playback that requires hours of manual fixes in desktop editors.
Standard timeline tools add optical flow but introduce ghosting on fast motion like a runner's stride or a spinning wheel. The output often shows duplicated limbs after the first 30 frames.
Where desktop workflows break
Premiere Pro and DaVinci Resolve cap reliable slow-mo at roughly 120 fps on 1080p footage before artifacts appear. Extending beyond that demands separate plugins that process one clip at a time and still leave edge halos on 4K material.
Users report spending 45 minutes per 5-second sequence just aligning motion vectors, then another 20 minutes correcting color shifts introduced during the slowdown.
How Flixly models handle high frame rates
Flixly routes requests to models trained for temporal consistency. Text to Video accepts a prompt and outputs a base 24 fps clip that Seedance 2.0 can then extend to 120 fps in a second pass.
Image to Video starts from a single reference frame and generates the in-between motion at 60 fps increments. The same pipeline accepts 1080p inputs and returns files sized at 1920x1080 with 240 fps playback.
Seedance 2.0 parameters
Seedance 2.0 accepts a 4-second source and returns an 8-second result at 120 fps. Credit cost sits at 18 credits per generation. The model keeps limb positions accurate across 288 total frames.
Veo 3.1 parameters
Veo 3.1 processes the same 4-second input into a 6-second 240 fps file at 4K resolution. It uses 32 credits and preserves fine details such as fabric folds during rapid movement.
Kling 3.0 parameters
Kling 3.0 supports reference-to-video workflows where a 720p still becomes a 10-second 180 fps sequence. Output files average 45 MB and require 24 credits.
Comparison table
| Model | Max FPS | Max Duration | Resolution | Credits | \ Typical Use Case |
|---|---|---|---|---|---|
| Seedance 2.0 | 120 | 8 s | 1080p | 18 | Action sports clips |
| Veo 3.1 | 240 | 6 s | 4K | 32 | Product spin shots |
| Kling 3.0 | 180 | 10 s | 720p | 24 | Character walk cycles |
| Wan 2.7 | 90 | 12 s | 1080p | 15 | Background motion extensions |
Edge cases and current limits
Rapid camera pans above 60 degrees per second still produce minor warping on the outer frame edges when using 240 fps targets. Veo 3.1 reduces this but does not eliminate it entirely on 4K exports.
Lip sync remains unsupported in the slow-mo pipeline. Lip Sync Video must run after the frame-rate increase, adding an extra 12 credits and a separate 3-second processing step.
Audio pitch correction is automatic only up to 180 fps. Beyond that, creators export the slowed video and apply Music Generation to replace the original track.
Workflow steps that produce consistent results
Start with a clean 1080p source clip under 5 seconds. Run it through Video to Video with a motion strength setting of 0.75. Follow with AI Video Effects set to temporal upscale at 120 fps. The full chain completes in under 90 seconds for most 8-second outputs.
Test one short sequence first. If edge artifacts appear, lower the target fps to 90 and re-run the second step. This adjustment cuts visible errors by roughly 70 percent on test footage.
The fastest path right now sits at Image to Video.
Frequently Asked Questions
What frame rate does Veo 3.1 reach for slow mo clips?▾
Veo 3.1 outputs 240 fps on 4K files up to 6 seconds long. The model keeps 288 frames coherent when started from a 4-second 24 fps source.
How many credits does a 120 fps slow mo generation cost?▾
Seedance 2.0 charges 18 credits for an 8-second 1080p result at 120 fps. Kling 3.0 uses 24 credits for a 10-second 180 fps file at 720p.
Can I combine slow mo output with lip sync on Flixly?▾
Lip sync must run after the frame-rate pass. The extra step adds 12 credits and processes the already slowed 1080p file in roughly 3 seconds.
What happens above 180 fps on audio tracks?▾
Pitch correction stops working reliably past 180 fps. Export the video and replace the audio track with a new generation from the music tool.
