https://lwn.net/Articles/247126/ This is a special feed containing comments posted to the individual LWN article titled "Video4Linux2 part 7: Controls". en-us Sat, 18 Oct 2025 10:54:54 +0000 Sat, 18 Oct 2025 10:54:54 +0000 https://www.rssboard.org/rss-specification lwn@lwn.net https://lwn.net/Articles/248751/ https://lwn.net/Articles/248751/ bronson You're talking about driving physical servos that control the camera's position and optics? I don't know, that's awfully specialized... It would take some work by a dedicated programmer with a few servo-controlled webcams to design a good, general purpose interface.<br> <p> There *is* motion support for a few webcams using private IOCTLs. Have you seen the VIDIOCPWCMPT ioctls on <a href="http://www.lavrsen.dk/twiki/bin/view/PWC/ApplicationProgrammingInterface">http://www.lavrsen.dk/twiki/bin/view/PWC/ApplicationProgr...</a> ?<br> <p> And here's an application that uses them (I think): <a href="http://www.fastpath.it/products/palantir/faq.html#7">http://www.fastpath.it/products/palantir/faq.html#7</a><br> <p> Fri, 07 Sep 2007 15:09:55 +0000 https://lwn.net/Articles/248735/ https://lwn.net/Articles/248735/ sdalley After failing to find a way of zooming and panning my webcam under ekiga, and seeing the V4L2 spec, I wondered "does V4L2 introduce the capability of doing this?" Alas, as far as I can see, it doesn't. Digital cropping yes, but optical zooming, or panning, no.<br> <p> The 110MB Windows foistware package that came with the webcam can do it though, so it definitely should be a capability of V4L2, no?<br> Fri, 07 Sep 2007 12:27:26 +0000