How to control exposure and gain using GStreamer

General Discussion
1

Hi,
I’m trying to control the exposure time and analogue gain of the Raspberry Pi camera using GStreamer with the libcamerasrc element.

When I tried checking the element properties, I got the below
auto-focus-mode : AfModeManual / AfModeAuto / AfModeContinuous
camera-name : Select camera

Version GStreamer 1.22.0

However, I don’t see any properties for: exposure-time, exposure-mode, analogue-gain, ae-mode (auto exposure). How do I set these controls to reduce motion blur on image capture using gstreamer pipeline.
//Current pipeline for streaming
std::string pipeline = "libcamerasrc ! " + std::string(m_caps) + " ! " + m_clockOverlay +
“queue name=q1 ! videoconvert ! jpegenc quality=80 ! multifilesink max-files=1 location=” + m_tmpFramePath;

2

Hi sowmiya,

These are indeed not exposed by the libcamerasrc GStreamer element, you’ll need to use the libcamera API directly, see here: Making sure you're not a bot!

It does mention an application lock, so you wont be able to both have libcamerasrc and a manually created lbicamera::Camera running, but you can work around this by pulling the FrameBuffers from libcamera and pushing them to an appsrc in your pipeline.