[Ffmpeg-devel] Color to grayscale switching

[Mathieu Minard - LABRI]

Quoting Tuukka Toivonen <tuukkat at ee.oulu.fi>:

> 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?

OK, thank you. In fact, the rate control was set to 200 kbps. If i raise it, i
obtain a bit smaller file size. Nevertheless, i would have expected a more
important reduction.

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