2026-04-08 04:02:00

I found a magic tool that solves my biggest headache in video creation.

Friends who create content know—you're shooting in portrait mode, but uploading to YouTube requires landscape. Cropping cuts off parts of the frame, adding black borders looks ugly.
Now there's an open-source tool that uses AI to extend the footage outward, truly generating new content that seamlessly matches the original scene.
This tool is called ComfyUI-Wan-VACE-Prep, based on Alibaba's Wan VACE model.
It's very easy to use: load the video → select extension direction → wait for generation. Key parameters:
The 5B version only needs 8GB of VRAM (most graphics cards are sufficient)
The 14B version supports 720p
About 3 minutes to process a 10-second video
I tested it locally, and the results are good enough for publication.
The scene transitions naturally, with no obvious AI artifacts. For friends distributing content across multiple platforms, this tool saves not just time but the entire workflow for adapting footage. In the future, you won’t need to worry about aspect ratios—just let AI handle the extension.
Search for ComfyUI-Wan-VACE-Prep on GitHub, it’s completely free.

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