Wan2.1 SkyReelsV2 VACE 14B T2V I2V Extend & Loop — v1.0.0

Cherry-pick the best segments for your final cut

Refine prompts step-by-step as the scene or motion evolves

🔧 Components

🌀 SkyReels-V2-VACE-GGUF (by wsbagnsv1 )

Based on Wan2.1 , fine-tuned in 720p@24fps videos

Integrated VACE (All-in-One Video Creation and Editing framework) allows motion control using reference videos (like ControlNet for video)

Native support in ComfyUI via GGUF format

Temporal consistency across the full sequence

⚡ LoRA Models

Speed

CausVid v2, https://huggingface.co/Kijai/WanVideo_comfy/blob/main/Wan21_CausVid_14B_T2V_lora_rank32_v2.safetensors

AccVid, https://huggingface.co/Kijai/WanVideo_comfy/blob/main/Wan21_AccVid_T2V_14B_lora_rank32_fp16.safetensors

Quality

MoviiGen, https://huggingface.co/Kijai/WanVideo_comfy/blob/main/Wan21_T2V_14B_MoviiGen_lora_rank32_fp16.safetensors

MPS, https://huggingface.co/alibaba-pai/Wan2.1-Fun-Reward-LoRAs/blob/main/Wan2.1-Fun-14B-InP-MPS.safetensors

HPS, https://huggingface.co/alibaba-pai/Wan2.1-Fun-Reward-LoRAs/blob/main/Wan2.1-Fun-14B-InP-HPS2.1.safetensors

All-in-one

FusionX, https://civitai.com/models/1678575 (T2V for VACE)

▶️ How to Use

🖼️ To Generate Video from an Image as First Frame

Enable "First Frame" from the muter node

Upload your input image

Set generation parameters:

Prompts (positive/negative)

Shift

Steps

Seed

Width / Height

Length (frame count)

Sampler

Scheduler

Click Run

🎥 To Extend or Loop an Existing Video

Enable "Video Extension" or "Video Loop" option

Upload or select your input video (via Load Image node, in animated webp format for optimal quality)

Set extension parameters:

Overlap Frame Count

Extension Frame Count

Prompts (positive/negative)

Shift

Steps

Seed

Sampler

Scheduler

Click Run

Number of Frames for Continuation (Adjust as Needed)

Overlap Frames : Number of frames carried over from the original animation.

Higher values increase temporal consistency and preserve the flow from the previous segment.

Lower values may result in more abrupt transitions or sudden changes in motion, tempo, or direction.

Extension Frames : Number of new frames to generate beyond the current animation.

⚠️ Challenges and Limitations

The base model is a T2V model , not a true I2V model.

The I2V is achieved by feeding a reference image into the VACE node , rather than directly preserving the image.

An I2V model typically keeps the input image as the exact first frame .

Here, VACE treats the image as loose guidance , not strict visual preservation

Examples:

If your source image lacks an object , but your prompt includes it , that object might be added to the first frame.

If the prompt contradicts the image , some original elements may be missing .

Fine details may degrade over time , especially in extended video generations .

📂 References

SkyReels V2 + VACE Overview (Reddit)

MoviiGen + VACE Overview (Reddit)

causvid wan img2vid - improved motion with two samplers in series (Reddit)

VACE Examples (HuggingFace)

SkyReels Diffusion Extension Example (GitHub)

VACE Extension is the next level beyond FLF2V (Reddit)

Loop Anything with Wan2.1 VACE (Reddit)

FAQ (Frequently Asked Questions)

❓ Can I run this with 16GB VRAM?

Yes. I ran it on an RTX 5060 Ti with 16GB VRAM using the Q6_K GGUF model.

With GGUF models, you can choose a version that fits your GPU memory:

Q3_X_X (3-bit) for ~8GB VRAM

Q4_X_X (4-bit) for ~12GB

Q5–Q6 for ~16GB

Q8 for ~24GB+

👉 Model & hardware info: https://huggingface.co/QuantStack/SkyReels-V2-T2V-14B-720P-VACE-GGUF

❓ Why do I get errors or bad video clips?

This workflow is still experimental , so crashes or poor results are common. Here are some tips:

OOM (out of memory) error = your GPU doesn’t have enough VRAM

Use a lower quant model (e.g. Q3 or Q4) to reduce memory usage

Lower the video resolution or clip length to avoid overload

If transitions look bad, try adjusting the prompt or other settings

Generate multiple times , then pick the best clips to stitch together

❓ Why does it give an error with certain resolutions?

The "WanVaceToVideo" node only accepts resolutions where both width and height are divisible by 16 . If your input resolution doesn’t meet this requirement, you’ll likely run into errors or processing failures.

Below are safe resolutions for commonly used aspect ratios, based on standard output heights (320, 368, 480, 544, 640, 720):

✅ Recommended Aspect Ratios & Resolutions (All values divisible by 16)

🖥 32:9 -> 1136x320

📽 21:9 -> 752x320, 864×368, 1120×480, 1264×544

🖼 2:1 -> 640x320, 736×368, 960×480, 1088×544, 1280×640

📺 16:9 -> 576x320, 656×368, 832×480, 960×544, 1136×640, 1280×720

🖥 16:10 -> 512x320, 592×368, 768×480, 864×544, 1024×640, 1152×720

📷 3:2 -> 480x320, 560×368, 720×480, 816×544, 960×640, 1088×720

🖼 4:3 -> 432x320, 496×368, 640×480, 720×544, 848×640, 960×720

🖼 5:4 -> 400x320, 464×368, 608×480, 688×544, 800×640, 896×720

❓ What should I do if I get a “Request Entity Too Large” error when uploading an image?

This error typically occurs when the file size exceeds the upload limit. To work around it:

Place the WebP file directly into the ComfyUI\input folder.

In ComfyUI, press Reload (R) to refresh the file list.

Use the Load Image node to select the file instead of using the “Choose file to upload” option.

VAE · 242 MB · Hugging Face · Comfy-Org/Wan_2.1_ComfyUI_repackaged