Video standards

[salsaman]

Hi, IMO hardware related would be more appropriate under display standards
Video standards could be more software related, and provide common
definitions, for example , allowing exchange of information between
applications which produce or consume video frames or streams of frames.
Some examples I can think of might be
 xdg_colorspace_RGB,
 xdg_colorspace_YUV

xdg_pixfmt_RGB24
xdg_pixfmt_YUV420p
etc

 xdg_gamma_linear
 xdg_gamma_sRGB

xdg_video_width
xdg_video_height

I could provide a more full list, but I think if it goes along this  route.
the starting point has to be what are we setting out to achieve with the
standards / definitions, and provide a range of speculative use cases.

Gabriel (salsaman)


On Thu, 28 Mar 2024 at 06:07, Pekka Paalanen <pekka.paalanen at haloniitty.fi>
wrote:

> On Wed, 27 Mar 2024 11:45:00 -0300
> salsaman <salsaman at gmail.com> wrote:
>
> > ISTR that the xdg video standards were never defined, If you need any
> > advice or assistance with this, I would be happy to act in an
> > advisory capacity if that is called for. I have over 20 years experience
> of
> > developing Free Software video and have been an active participant in
> > developing other video / effects standards. I have been a bit our of the
> > spotlight recently as I have been busy architecting and implementing the
> > core components of the upcoming next gen LiVES 4,0 video application plus
> > its accompanying state-of-the-art effects standard)
>
> Hi,
>
> what kind of video standards would that be?
>
> I'm wondering if it would have anything to do with Wayland color
> management and HDR:
>
> https://gitlab.freedesktop.org/pq/color-and-hdr
>
> https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/183
>
> https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/14
>
> Would there need to be any XDG standards to support color managed HDR
> desktops, or is the window system support enough?
>
> I have not much in my mind, but then I've been staring only at the
> window system interactions, and haven't seen what else the desktop
> ecosystem or applications might need.
>
> Recommended display calibration and measurement procedures maybe?
>
> Desktop viewing environment standards?
>
> Viewing environment measurement?
>
> They could be as straightforward as referring to a freely available
> ITU-R or SMPTE papers or others, if there are suitable ones.
>
>
> Thanks,
> pq
>
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