[FEATURE]: Aliases for ffmpeg tone curves and primaries
See original GitHub issueFfmpeg provides a large set of primaries and transfer functions (OETFs) for use as metadata in video formats, with the -color_trc
and -color_primaries
parameters (or equivalent AVFrame
members).
Allowed values for these options are stated to come out of ISO/IEC 23001-8:2013 in libavutil/pixfmt.h, and reference existing standards and recommendations that are for the most part already implemented in colour-science.
Is there any interest in adding aliases to let people reference these more easily?
Issue Analytics
- State:
- Created a year ago
- Comments:10 (7 by maintainers)
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Well, technically we do support linear transfer (so Y of YCbCr is indeed Y of XYZ) just not in ffplay directly (strange open bug), alas, but mpv that uses ffmpeg almost in full, does support it using ffmpeg primitives.
Check with mpv vs ffplay: https://forum.videohelp.com/attachments/43324-1507526652/dpx-sequence.zip
We do (at least with zscale) support constant luminance, where Y of YCbCr is indeed Y of XYZ since you first apply the matrix on to get linear Y of YCbCr and only then apply nonlinearity to get Y’.
If they are all the same we could alias them as an option, we sometimes do that, e.g. https://github.com/colour-science/colour/blob/develop/colour/characterisation/datasets/colour_checkers/sds.py#L3188, then we would describe that they are all the same in the doctrings.
colour.models.rgb.video
works for me!