Can you please help me understand what are the differences between YUV420 and YUV422 format? I read this, http://www.fourcc.org/yuv.php, but I can't find the difference.
And does "YUV420" and "YUV420 SP" mean the same thing? And does "YUV422" and "YUV422 I" mean the samet thing?
Thank you.
4:2:2: The two chroma components are sampled at half the sample rate of luma: the horizontal chroma resolution is halved.
4:2:0: The two chroma components are sampled at half the sample rate of luma both horizontally and vertically (i.e. there's one U and one V per 2x2 group of Ys).
For info regarding other variations, see this, this and this.
来源：https://stackoverflow.com/questions/22793155/difference-between-yuv420-and-yuv422