[FFmpeg-user] Requesting colormatrix advice

[Phil Rhodes]

    On Tuesday, 7 November 2023 at 10:30:33 GMT, Paul B Mahol <onemda at gmail.com> wrote:  
 > Use setparams filter to properly tag inputs colorspace related metadata.

Y'know, I've been dealing with this stuff for twenty-plus years, and I'm not very clear on exactly what you're trying to suggest Mark does here.
What software are you referring to? Is it documented anywhere? Are there examples?
P