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Warn developers about absolute/relative UVC controls #4941

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Mar 30, 2021
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Warn developers about absolute/relative UVC controls #4941

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9945f48
Add warning about absolute/relative UVC controls
beaufortfrancois Mar 22, 2021
d347095
Update src/site/content/en/blog/camera-pan-tilt-zoom/index.md
beaufortfrancois Mar 24, 2021
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17 changes: 13 additions & 4 deletions src/site/content/en/blog/camera-pan-tilt-zoom/index.md
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Expand Up @@ -5,7 +5,7 @@ subhead:
authors:
- beaufortfrancois
date: 2020-10-05
updated: 2020-11-18
updated: 2021-03-22
hero: image/admin/wbcUb7ooaR1nCeYnSiCV.jpg
thumbnail: image/admin/eBugU3Spjq9df1qb5l0b.jpg
alt: Five persons in a conference room photo.
Expand Down Expand Up @@ -106,10 +106,18 @@ try {

To know whether a Chromium-based browser supports PTZ for a camera, go to the
internal `about://media-internals` page and check out the "Pan-Tilt-Zoom" column
in the "Video Capture" tab.
in the "Video Capture" tab; "pan tilt" and "zoom" respectively mean the camera supports
the "PanTilt (Absolute)" and "Zoom (Absolute)" [UVC controls]. The "PanTilt (Relative)"
and "Zoom (Relative)" UVC controls are not supported in Chromium-based browsers.

<figure class="w-figure">
{% Img src="image/admin/TbU7mM3pfq0bNTkgiOnZ.jpg", alt="Screenshot of the internal page in Chrome OS to debug PTZ camera support.", width="800", height="500", class="w-screenshot" %}
{% Img
src="image/vvhSqZboQoZZN9wBvoXq72wzGAf1/4EDS8fYYifXAUY6SBaiV.png",
alt="Screenshot of the internal page in Chrome OS to debug PTZ camera support.",
width="800",
height="481",
class="w-screenshot"
%}
<figcaption class="w-figcaption">Internal page to debug PTZ camera support.</figcaption>
</figure>

Expand Down Expand Up @@ -220,8 +228,9 @@ Hero image by [Christina @ wocintechchat.com] on [Unsplash].
[mandatory constraints]: https://developer.mozilla.org/en-US/docs/Web/API/Media_Streams_API/Constraints#Specifying_a_range_of_values:~:text=mandatory
[`MediaStream`]: https://developer.mozilla.org/en-US/docs/Web/API/MediaStream
[Permissions API]: https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API
[UVC controls]: https://www.usb.org/document-library/video-class-v15-document-set
[PTZ advanced constraints]: https://bugs.chromium.org/p/chromium/issues/detail?id=1126045
[Page Visibilty API]: https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
[Page Visibility API]: https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
[demo]: https://ptz.glitch.me/
[check out the source code]: https://glitch.com/edit/#!/ptz?path=public%2Fscript.js
[run Chrome with the switch]: https://www.chromium.org/developers/how-tos/run-chromium-with-flags
Expand Down