ComfyUI Video Stabilizer
ComfyUI Video Stabilizer 是一个用于在 ComfyUI 中进行视频防抖的 custom node。
主要有以下 3 个功能。
- 对视频进行手抖补正
- 从补正后的视频中还原原本的手抖
- 添加人工手抖
安装
nomadoor/ComfyUI-Video-Stabilizer
- 请通过
ComfyUI Manager安装。
手抖补正
手抖补正使用 Video Stabilizer Classic 或 Video Stabilizer Flow。
功能完全相同，只是处理方式不同。
Flow 稍微重一些，但效果好很多，所以基本上推荐使用 Flow。
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参数
Video Stabilizer Classic 和 Video Stabilizer Flow 的参数是共通的。
| Parameter | 说明 |
|---|---|
frame_rate |
输入视频的 FPS。它会作为时间方向 smoothing 的基准。 |
🎞️ framing_mode |
处理手抖补正后画面边缘缺失的方式。这个参数在视频里很容易看出差异。 |
transform_mode |
用哪种变换来估计相机运动。 |
🔒 camera_lock |
让画面更接近三脚架拍摄的固定镜头。 |
strength |
去除估计出的相机运动的强度。0.0 基本保持原来的运动，1.0 会进行较强补正。 |
smooth |
让相机运动变得多平滑。值越高，越能抑制突然的抖动。 |
keep_fov |
只在 framing_mode 为 crop 时有效。指定保留多少视角。1.0 缩放较少，0.0 则牺牲视角来消除边缘空白。 |
padding_color |
padding 区域的颜色。如果后续用 padding_mask 做 inpaint / outpaint，颜色本身并不太重要。 |
🎞️ framing_mode
crop- 稍微放大 / 裁剪视频，让空白边缘不可见。
- 抖动越大，视角会变得越窄。
crop_and_pad- 尽量保留原来的视角，不足的部分用 padding 填充。
- padding 部分会作为
padding_mask输出。
expand- 完全不裁剪，只根据需要扩大画布。
一般的视频编辑软件大多只能做接近 crop 的处理，但如果使用视频生成模型，就可以把 padding 部分当作 mask 来 outpainting。这样会有一些很有意思的用法。
🔒 camera_lock
启用 camera_lock 后，虽然并不完美，但会把视频调整得更接近三脚架拍摄的固定镜头。
普通的手抖补正只是让相机运动“更平滑”，而 camera_lock 会尽量把相机运动停下来。
还原手抖
在视频编辑中，先消除手抖再处理，有时会更稳定；但如果一直保持防抖后的状态，原本的临场感也会消失。
使用 Video Stabilizer Motion Apply，可以把之前用 Video Stabilizer 消除的手抖反向应用回来，从而还原原来的运动。
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如果用
crop或crop_and_pad做了补正，已经被裁掉的像素无法恢复。如果后面还想还原手抖，最开始补正时建议使用expand。
添加人工手抖
不限于 AI 生成的视频，如果相机运动过于平滑，有时会显得有些 CG 感。
这时有意识地添加一点手抖，可以营造临场感和真实感。
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},
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"outputs": [
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"properties": {
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},
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}
],
"properties": {
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Video Stabilizer Shake Generator 用来生成人工相机抖动，再把它交给 Video Stabilizer Motion Apply，就可以让视频产生抖动。
参数
| Parameter | 说明 |
|---|---|
frame_rate |
输入视频的 FPS。当视频侧没有 FPS 元数据时，会作为 fallback 使用。 |
style |
抖动的类型。 |
amount |
抖动强度。只想稍微增加自然感时，较低的值就足够了。调得太高会很容易让人看着不舒服。 |
speed |
抖动速度。想要较慢的手持感就调低，想要更细碎、更忙的抖动就调高。 |
seed |
抖动的随机 seed。即使其他设置相同，改变 seed 也会改变抖动方式。 |
style
tripod: 添加接近固定相机的、非常轻微的抖动。handheld: 添加自然的手持相机风格抖动。walking: 添加像边走边拍那样的上下 / 左右抖动。action: 添加更强、更粗糙的运动。vibration: 添加细小振动。
还有一个叫做
Video Stabilizer Shake Generator Manual的节点。 它不是使用 preset，而是可以通过内部参数细调运动。
Motion Blur
Video Stabilizer Motion Apply 也可以添加 motion blur。
稍微加一点后，会更接近真实相机拍摄的氛围。