[Ffmpeg-devel] Color to grayscale switching

[Tuukka Toivonen]

On Tue, 31 May 2005, Mathieu Minard - LABRI wrote:

> i have implemented a function that removes chroma planes from YUV420P frames. I
> have done this by setting all chrominances values (UV) to the value 128. Now i
> wonder why it doesn't lead to smaller output file size?

Maybe the bits are spent to luma--and they definitely are if you used 
rate control. Did you get PSNR increase in luma?