---
title: 'How to Use Frame Interpolation in ComfyUI for Fluid Animations'
source: 'https://youtube.com/watch?v=alu-lcIfGoY'
video_id: 'alu-lcIfGoY'
date: 2026-07-28
duration_sec: 238
---

# How to Use Frame Interpolation in ComfyUI for Fluid Animations

> Source: [How to Use Frame Interpolation in ComfyUI for Fluid Animations](https://youtube.com/watch?v=alu-lcIfGoY)

## Summary

Frame interpolation is a video processing technique that inserts additional frames into footage to make it look smoother. This tutorial explains how to implement it within ComfyUI using a custom node.

### Key Points

- **What is Frame Interpolation** [0:00] — Frame interpolation inserts additional frames into footage to make it look smoother.
- **Installing the Custom Node** [0:10] — Go to Manager, install custom nodes, search 'interpolation', and install the ComfyUI Frame Interpolation custom node.
- **Example Workflow Overview** [0:26] — A two-second video (60 frames) of waving passes through control nets, textual prompts, and Animate Diff to create a short video.
- **Adding Frame Interpolation Node** [0:45] — Add Node > ComfyUI Frame Interpolation > VFI > Film VFI. Connect to frames and video combine node.
- **Settings for Smooth Output** [1:07] — Use multiplier of 2 to double frames, set FPS to 60, create preview node, set to H264 for quality.
- **Result and Comparison** [1:30] — After 40 seconds, 119 frames created (~60 FPS). Side-by-side shows smoother animation compared to original 30 FPS.
- **Other Interpolation Methods** [1:56] — Multiple methods available; testing showed similar results to Film VFI.
- **GMFSS Fortuna for Hand-drawn Content** [3:07] — GMFSS Fortuna VFI is designed for hand-drawn cartoons or anime animations.

### Conclusion

Frame interpolation in ComfyUI is a quick and easy way to smooth out animations, with multiple methods available including a specialized one for hand-drawn content.

## Transcript

Frame interpolation is a video processing 
technique that inserts additional frames  
into your footage to make it look much smoother. 
Here's how you can do it within Comfy UI. First,  
you're going to want to go to your manager 
and then install custom nodes. Then,  
search the term "interpolation". 
Next, install this Comfy UI frame  
interpolation custom node. Once that's 
installed, we can add it to our workflow.
Just to give you a brief, high-level 
summary: I have two-second video footage  
that's a total of 60 frames of myself waving. 
This passes through a couple of control nets,  
along with textual prompts and "Animate 
Dip", to create this short form video. Now,  
while this video looks good, frame 
interpolation will make it look even better.
To do this, it's fairly straightforward. Go 
to "Add Node", "Comfy UI Frame Interpolation",  
"VFI", and then select "Film VFI". 
Next, connect this to the frames and  
also bring in the video combine custom node 
to stitch all the images together. After that,  
connect this here. Since we're going to use 
a multiplier of two, which will basically  
double the number of frames, go ahead and 
increase the frames per second to 60. Also,  
create a preview node for review and set this to 
H264 for better quality. Then, cue the prompt.
After 40 seconds, it created a total of 119 
frames. There is some math that drops that  
last extra frame, but it's roughly about 
60 frames per second. Here's our animation  
side by side. As you can see, it's a little 
smoother compared to our original 30 frames  
per second output. It is a very quick and 
easy way to really smooth out animations.
Now, I want to touch on the other frame 
interpolation methods available within this custom  
node, as well as some of the additional options. 
As you can see, there are quite a few that you can  
test against. I recommend testing this for all 
sorts of different animations. However, I found  
that the results weren't really all that different 
to the original film VFI that I had done earlier.
Lastly, I want to mention the GMFSS Fortuna VFI, 
which is specifically designed for hand-drawn  
cartoons or anime animations. If that's 
the type of artwork that you're creating  
with a Comfy UI workflow, you might want 
to use that interpolation method instead.
That's all for adding frame interpolation 
to your workflow. If you have any questions,  
please leave them in the comment section below. 
This entire workflow is available to download,  
so you can play with it and incorporate 
it into your personal workflow.
Thanks so much for watching. Consider hitting the  
thumbs up button and subscribing. I'll 
see you in the next video. Take care.