ffmpeg实例，colorkey，chromakey抠图的使用

---

ffmpeg命令目录

---

colorkey和chromakey用法参数基本一样

colorkey命令文档

color
The color which will be replaced with transparency.
用于抠图的背景色。这个色值将会被替换成透明色

similarity
Similarity percentage with the key color.
0.01 matches only the exact key color, while 1.0 matches everything.
相似度，范围[0.01-1]，1的话匹配所有色值


blend
Blend percentage.
0.0 makes pixels either fully transparent, or not transparent at all.
Higher values result in semi-transparent pixels, with a higher transparency the more similar the pixels color is to the key color.
透明度[0-1]，默认0，完全透明，例如0.5则是50%的透明度

原图：

colorkey抠图效果

ffmpeg -i pic1.png -vf colorkey=0xc9c8c8:0.3 -y colorkey_test_1.png