Video standards

[salsaman]

colour management and hdr mostly intersect with three areas of video:
pixel formats, yuv <-> rgb conversions and gamma transfer functions.
For example
xdg_pixformat_yuv121010
xdg_subspace_bt2020
xdg_gamma_bt2020

just off the top of my head, these arent intended to be actual suggestions


On Thu, 28 Mar 2024 at 18:57, salsaman <salsaman at gmail.com> wrote:

> In addition, I am not sure if there are xdg standards for audio, but I
> would suggest video and follow similar hierarchies, and that both could be
> classed under a more generic xdg multimedia standard.
>
>
> On Thu, 28 Mar 2024 at 18:48, salsaman <salsaman at gmail.com> wrote:
>
>> 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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