[v4] document sample range in ffv1

[dericed]

Proposing that ffv1 describe whether yuv pixel formats should be decoded as full range or broadcast range (others?).

[JeromeMartinez]

would be in more global metadata (not used for decoding) color description (with colour primaries, transfer haracteristics, matrix coefficients...) in the Parameters() part.

[dericed]

IIUC this can't fit in version 3 but would require being within a if (version >= 4) {. I see that FFmpeg already includes an experimental version 4, so does that extension of the Parameters () already exist?

[retokromer]

I see that FFmpeg already includes an experimental version 4

Are details available somewhere, or has one to reverse engineer it?