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Comments on With a V4L2-compatible webcam, how to see its video feed for the purpose of adjusting aiming?

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With a V4L2-compatible webcam, how to see its video feed for the purpose of adjusting aiming?

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I have ordered (but am still waiting for it to arrive) a USB-connected webcam that is supposed to be V4L2 compatible.

Once it arrives, I'm obviously going to want to mount it such that it provides a reasonable picture with minimal ongoing adjustments. I imagine that the easiest way to do so is to simply run some application that shows me what the camera is seeing, and then adjust the camera as needed to get a good result.

The system in question is currently running Debian 10/Buster, but upgrading to 11/Bullseye is on my to-do list, so a solution should ideally work with both of those, preferably without having to download and install out-of-repository applications on either (so any tools suggested should be in both the buster and bullseye Debian repositories).

I found qv4l2 ("test bench application for video4linux devices") which looks somewhat promising for making adjustments, but I haven't found anything that will let me actually see what the webcam is seeing.

How can I accomplish the latter?

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2 comment threads

Expected use cases (2 comments)
Green playback button? (2 comments)
Green playback button?
elgonzo‭ wrote about 3 years ago · edited about 3 years ago

With respect to qv4l2, is the GUI you are seeing the same as in this screenshot: https://screenshots.debian.net/package/qv4l2#gallery-1 ? If so, have you tried clicking on the green playback (capture) button?

elgonzo‭ wrote about 3 years ago · edited about 3 years ago

In case it happens that there will be an issue qith q4l2 not supporting the codec used by the camera, perhaps using VLC for viewing the stream might do: https://wiki.videolan.org/Documentation:Modules/v4l2/