[MPlayer-users] Distortion between different versions of MPlayer/Mencoder

[AthlonRob]

On Sat, 2003-10-04 at 21:34, D Richard Felker III wrote:

> > And are there cases where block sizes of 8 are as good as 16?
> 
> For the most part, no. Chroma is subsampled, so an 8x8 chroma block
> comprises 16x16 (for standard 4:2:0) of the full image dimensions.
> Thus, while individual mpeg blocks are only 8x8, you need dimensions
> that are multiples of 16 to keep from having incomplete chroma blocks.

I'm all confused.

What you're saying is each dimension (width and height) needs to be
evenly divisible by sixteen for the highest quality?

But there is *not* a ratio (width:height) that needs to be maintained if
you're cropping?

We just need to keep the width and the height both evenly divisible by
sixteen?

Rob