[libcamera-devel] How to use this library

[David Plowman]

Hi Jason

Thanks for your question. Perhaps you can provide some details about
your setup and what you've tried?

1. What kind of Raspberry Pi do you have? Are you using it with a
local keyboard and display, or (for example) via ssh?

2. It might be helpful to report the responses you get from "uname -a"
and "sudo vcdbg version", just to check what software versions you are
running.

3. What kind of camera module do you have? If it's an imx219 or an
imx477 then it has to be an official Raspberry Pi model; for other
supported sensors there are no restrictions.

4. Did you follow all the build instructions libcamera-apps page
successfully? Have you also added the correct dtoverlay to your
/boot/config.txt for your sensor? Did qcam work when it suggested
trying it?

5. If you comment out the dtoverlay line for your sensor and reboot,
does "raspistill -t 0" display a camera image?

Best regards
David

On Fri, 26 Mar 2021 at 20:55, Jason H <jhihn at gmx.com> wrote:
>
> So I can't find any good getting started guide on how to use this, and there isn't a
> liubcamera-users email list that I can find. But my own attempts have resulted in frequent crashing.
>
> I am trying to use the libcamera-apps fom RaspberryPi:
> https://github.com/raspberrypi/libcamera-apps
>
> However my efforts have been not successful in adapting their code.
> I don't want any preview - I just want to get images (memory access ok, if it
> is RGB888, BGR888, or I'll also accept file output as well) I don't want a preview,
> window, and I only want/need one frame per second (a sequence of stills). The code
> is already written against another library with a timer to acquire frames.
>
> My instant problem is on my pi (with a camera) it does not find any cameras: (cameras().size() == 0)
>
> camera_manager_ = std::make_unique<CameraManager>();
> int ret = camera_manager_->start();
> if (ret)
>     throw std::runtime_error("camera manager failed to start, code " + std::to_string(-ret));
>
> if (camera_manager_->cameras().size() == 0)
>     throw std::runtime_error("no cameras available");
>
> There is stuff in the v4l tree:
> /dev/v4l/by-path/platform-bcm2835-codec-video-index0
> /dev/v4l/by-path/platform-bcm2835-isp-video-index1
> /dev/v4l/by-path/platform-bcm2835-isp-video-index3
> /dev/v4l/by-path/platform-bcm2835-isp-video-index0
> /dev/v4l/by-path/platform-bcm2835-isp-video-index2
>
> I don't know what to do next.
> Help?
>
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