Video standards

[salsaman]

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
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/xdg/attachments/20240328/b453631e/attachment.htm>