最近超级帮到我的技巧：用 Seedance 将视频扩展成不同的画幅比~！

下面这一条是我们为即将到来的前滩生活节制作的官方宣传片~

由于影片会投放到不同的线下大屏，我们通常会需要做不同的画幅比版本，但重做是很大的开销，所以一般就在原素材的上下或者左右，添加一些平面包装来撑满画幅。

前不久看到 X 上@Framer_X 分享的 Seedance 转换画幅比的技巧，试了一下，居然真的可以~！！！

Prompt "Convert the original 16:9 horizontal video @(TAG THE VIDEO) into a native 9:16 vertical video.

Do NOT simply crop the original video. Intelligently reframe and extend/reconstruct the scene so the vertical composition feels like it was originally created in 9:16.

Preserve all important visual information, characters, actions, objects, background details, and story beats from the original horizontal video. Reposition elements naturally within the vertical frame when necessary so nothing important is cut off.

Keep the exact same characters, animation, actions, timing, camera movement, environment, lighting, colors, saturation, and visual style as the original video.

Maintain correct anatomy, object geometry, perspective, spatial relationships, and continuity. Newly generated areas outside the original frame must seamlessly match the existing environment.

Final result: 9:16 vertical, full-frame, naturally composed, no black bars, no stretched image, no important details cropped, and visually consistent with the original 16:9 video."

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