4k AI Video ComfyUI Workflows

These are the workflows I used to create 4K AI videos on a laptop with an RTX4060 that only has 8GB of VRAM.

Read the article about this project on my blog.

Watch this YouTube video to learn more about the project.

This is a sample of the videos I've made with these workflows.

Notes

ComfyUI's WAN examples

Models on Huggingface

I found that you tend to avoid issues with each step broken out into a different workflow and running them one at a time rather than tie too many steps together. However, you may still need to restart ComfyUI or your computer at times, especially if you are getting garbage back.

You may need to use the tiled VAE Decoder node, which is included in workflow that might need it.

Text-to-Video can run both t2v_14B_fp16 or t2v_14B_fp8_scaled models, but Image-to-Video crashed unless I used i2v_480p_14B_fp8_scaled.

Image-to-Video produces better quality more often than Text-to-Video. Just try to use a higher resolution image.

THIS REQUIRES PATIENCE!! Is this better than paying for a service? Maybe not, but I wanted to see if I could do it and to see what I would learn.

I learned a ton from this project, which is what matters most!

Resolution = Time w/ 8GB VRAM

480p = 44 minutes (odd artifacts)
16:9 = 832x480

10-15 minutes! (low quality)
16:9 = 512x288
9:16 = 288x512

60 minutes! (decent quality)
16:9 = 910x512
9:16 = 512x910

Target Size	2x Upscale	4x Upscale
1920×1080	960×540	480×270
3840×2160	1920×1080	960×540

Workflows Provided

• Text-to-Video WAN 2.1
• Image-to-Video WAN 2.1
• WEBP-to-4k Upscaler for WAN2.1 generations
• MP4--to-4k Upscaler for FramePack generations

Getting Started

1. Drop the workflows into the ComfyUI\user\default\workflows folder.

2. Download the models (links below)

3. Start ComfyUI

4. Install any missing custom nodes

5. Have Fun!

Model Links and Locations

Model: wan2.1_i2v_480p_14B_fp8_scaled.safetensors Location: ComfyUI\models\diffusion_models\

Model: wan2.1_t2v_14B_fp16.safetensors Location: ComfyUI\models\diffusion_models\

Model: wan2.1_t2v_14B_fp8_scaled.safetensors Location: ComfyUI\models\diffusion_models\

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Model: wan_2.1_vae.safetensors Location: ComfyUI\models\vae\

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Model: 4x_foolhardy_Remacri.pth Location: ComfyUI\models\upscale_models\

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Model: clip_vision_h.safetensors Location: ComfyUI\models\clip_vision\

Model: umt5_xxl_fp8_e4m3fn_scaled.safetensors Location: ComfyUI\models\clip_vision\

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Useful Sites

WAN 2.1 site

FramePack GitHub page