ComfyUI-DownsampleFPS

ComfyUI-DownsampleFPS

A node for ComfyUI to downsample framerate ie. from 48 to 24.

<img width="294" height="203" alt="image" src="https://github.com/user-attachments/assets/b0467347-4307-48f8-86d2-3ee55300d781" />

Methods available:

"Frame dropping"

"Frame blending (CPU)"

"Optical flow (CPU)"

"Motion compensated (CPU)"

Installation

Method 1: Clone the Repository Navigate to your ComfyUI custom_nodes directory. Run:

git clone https://github.com/Austat/ComfyUI-DownsampleFPS

Restart ComfyUI.

Here’s the mental map you can keep - Each method is fast and really isn't resource hog. Computational time is usually in seconds (100 seconds lenght video takes five seconds on 32 cores):

<details> <summary>Details about each method</summary>

1. Frame dropping

Just picks certain original frames.

No blending, no flow, nothing.

Fastest. Sharpest individual frames. Choppy motion.

2. Frame blending

Averages neighboring frames.

No motion understanding.

Removes harsh stutter at the price of ghosting.

3. Optical flow

Computes motion.

Warps frame1 halfway to frame2.

Can generate intermediate-looking frames but prone to warpy artifacts when flow fails.

4. Motion compensated

Computes motion.

Warps both frame1 forward and frame2 backward.

Blends warped frames for a more symmetric and robust mid-frame.

By visual result

• If you care about absolute sharpness, don’t mind choppiness: Use Frame dropping.

• If you want fewer artifacts and can accept mild ghosting: Use Frame blending.

• If you want smoother motion and can tolerate potential warping artifacts: Use Optical flow.

• If you want best motion-aware quality within CPU Farneback: Use Motion compensated — your most advanced method here.

By failure modes

• Dropping:

Fails by being visually choppy. No weird artifacts, just temporal roughness.

• Blending:

Fails via ghosting — double exposures and soft blur.

• Optical flow:

Fails via weird warping/stretching, especially around edges or fast motion.

• Motion compensated:

Fails similarly to optical flow, but blending two warped views sometimes hides the worst of it.