Step-by-Step Guide Series:
ComfyUI - StartEndFrames Workflow

This article accompanies this workflow: link

Workflow description :

This workflow aims to create a video between two images of your choice.

Prerequisites :

If you are on windows, you can use my script to download and install all prerequisites : link

ComfyUI,
Microsoft Visual Studio build tools :

winget install --id Microsoft.VisualStudio.2022.BuildTools -e --source winget --override "--quiet --wait --norestart --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 --add Microsoft.VisualStudio.Component.Windows10SDK.20348"

📂Files :

I2V Quant Model: Wan2.1-I2V-14B-480P-gguf or Wan2.1-I2V-14B-720P-gguf
In models/diffusion_models

Recommendation :
24 gb Vram: Q8_0
16 gb Vram: Q5_K_S
<12 gb Vram: Q4_K_S

CLIP: umt5_xxl_fp8_e4m3fn_scaled.safetensors
in models/clip

CLIP-VISION: clip_vision_h.safetensors
in models/clip_vision

VAE: wan_2.1_vae.safetensors
in models/vae

ANY upscale model (depreciated):

Realistic : RealESRGAN_x4plus.pth
Anime : RealESRGAN_x4plus_anime_6B.pth

in models/upscale_models

📦Custom Nodes :

Don't forget to close the workflow and open it again once the nodes have been installed.

Usage :

In this new version of the workflow everything is organized by color:

Green is what you want to create, also called prompt,
Red is what you don't want,
Yellow is all the parameters to adjust the video,
Pale-blue are feature activation nodes,
Blue are the model files used by the workflow,
Purple is for LoRA.

We will now see how to use each node:

Write what you want in the “Positive” node :

Write what you dont want in the "Negative" node :

Choose if you want automatic prompt addition :

If enabled, the workflow will analyze your image and automatically add a prompt to your.

Select image format :

The larger it is, the better the quality, but the longer the generation time and the greater the VRAM required.

Choose a number of steps :

I recommend between 15 and 30. The higher the number, the better the quality, but the longer it takes to generate video.

Choose number of frames :

A video is made up of a series of images, one behind the other. Each image is called a frame. So the more frames you put in, the longer the video.

Choose the guidance level :

I recommend to star at 6. The lower the number, the freer you leave the model. The higher the number, the more the image will resemble what you “strictly” asked for.

Choose a Teacache coefficients :

This saves a lot of time on generation. The higher the coefficient, the faster it is, but increases the risk of quality loss.

Recommended setting :

for 480P : 0.13 | 0.19 | 0.26
for 720P : 0.18 | 0.20 | 0.30

Choose a shift level :

This allows you to slow down or speed up the overall animation. The default speed is 8.

Choose a sampler and a scheduler :

If you dont know what is it, dont touch it.

Define a seed or let comfy generate one:

Import your start and end image :

Don't forget that it will be reduced or enlarged to the format you've chosen. An image with too different a resolution can lead to poor results.

Select your model and set virtual VRAM :

Here, you can switch between Q8 and Q4 depending on the number of VRAMs you have. Higher values are better, but slower.

The virtual VRAM setting allows you to unload part of the model into your RAM instead of your VRAM. This allows you to load larger models or increase stability at a very slight performance penalty.

The right amount depends a lot on your available VRAM. The easiest way is to gradually increase this setting until you notice that all of your VRAM is consumed during video generation. (Indeed, if 100% is used, it is probably you are actually in an overflow situation.)

Add how many LoRA you want to use, and define it :

If you dont know what is LoRA just dont active any.

Now you're ready to create your video.

Just click on the “Queue” button to start:

A preview will be displayed here, then the final video :

But there are still plenty of menus left? Yes indeed, here is the explanation of the additional options menu:

If you have enabled auto-prompt you can see here the final prompt used by the workflow.

These nodes allow you to enable interpolation and choose its factor. To put it simply, this will generate intermediate frames and thus increase the fluidity of the video.

Here you can enable an upscaler. This allows you to increase the resolution of your video. Simply select a model from the list and then the resolution increase ratio.

This option saves the last frame of your video. This makes it easy to create a sequel by reusing this frame as the start for a new video.

Here you can activate SageAttention. This option is quite complex, you can read my dedicated guide here. If you don't know what it is, don't enable it. If you have used my installer for ComfyUI you can use this optimization.

This last node allows you to activate different optimizations:

torch compile improves speed but does not work with LoRAs,
skip layer improves video quality,
Tea cache improves speed,
CFGZeroStar improves the "stickiness" of your prompt.

Some additional information:

Organization of recordings:

All generated files are stored in comfyui/output/WAN/YYYY-MM-DD.

Depending on the options chosen you will find:

"hhmmss_OG_XXXXX" the basic file,
"hhmmss_IN_XXXXX" the interpoled,
"hhmmss_UP_XXXXX" the upscaled,
"hhmmss_LF_XXXXX" the last frame.

Attention: if you're using a 720p model, you'll also need to change the "Apply Tea Cache" node settings.

Step-by-Step Guide Series: ComfyUI - StartEndFrames

Step-by-Step Guide Series:
ComfyUI - StartEndFrames Workflow

Workflow description :