[FFmpeg-user] colorspace v colormatrix

[Mark Filipak]

What is the relationship between colormatrix and colorspace? Are they used together or separately? 
Is colorspace obsolete? Is colormatrix a newer version of colorspace, but one that works correctly?

Colorspace appears to be not needed. Is that true?

Or, presented another way, in what circumstances should I use only colormatrix, in what 
circumstances should I use only colorspace, and in what circumstances should I use both?

Thanks!--Mark.