[FFmpeg-devel] [PATCH 2/2] lavfi/vf_colorspace: Add SMPTE ST 2084 support

[Tomas Härdin]

mån 2023-02-06 klockan 10:35 +0100 skrev Tomas Härdin:
> fre 2023-02-03 klockan 08:29 -0800 skrev Pierre-Anthony Lemieux:
> > On Fri, Feb 3, 2023 at 7:54 AM Tomas Härdin <git at haerdin.se> wrote:
> > > 
> > > We need something better for proper tonemap support, but this is
> > > at
> > > least useful for getting the HDR discussion going.
> > 
> > Below is a demonstration of two tonemap methods:
> > 
> > https://www.sandflow.com/public/tone-mapping/index.html
> 
> Does not work in Firefox. But it does work in Chromium. Looks like it
> could be static images only.
> 
> Anyway what I feel bears discussion is whether we should add a field
> to
> AVCodecContext like "nits" that says how many nits the max values of
> integer pixel formats correspond to, and similarly for float formats
> what 1.0 corresponds to. The latter is usually 203 cd/m² but is it
> always? The link you posted appears to use 100 cd/m²:
> 
> > l_sdr = 100;

Another thing: we probably need a float YUV format

/Tomas