AHD Camera

Supports input from 8 AHD cameras with aviation plug interfaceClick to purchase，Each channel supports resolutions of 720p@25/30fps.

Power Adapter

../../_images/ahd-power.png

Firmware Update

If it does not match, burn the firmware Refer to the chapter 《Upgrading Firmware with USB Cable》 for the burning method.

AHD Camera Corresponding Device Nodes

AHD Device Node
AHD1 /dev/video0
AHD2 /dev/video1
AHD3 /dev/video2
AHD4 /dev/video3
AHD5 /dev/video8
AHD6 /dev/video10
AHD7 /dev/video11
AHD8 /dev/video12

Modify Test Script

Modify /rockchip-test/camera/camera_rkisp_test.sh Open camera_rkisp_test.sh，then remove the last line and add:

DISPLAY=:0.0 gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video1 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video2 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video3 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video8 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video10 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video11 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false &
gst-launch-1.0 -v v4l2src device=/dev/video12 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false

If testing a single AHD channel, be sure to execute with sudo:

sudo gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, format=NV16,width=1280, height=720, framerate=30/1 ! fpsdisplaysink sync=false

Validate Test Script

sudo /rockchip-test/camera/camera_rkisp_test.sh

Successful execution result:

neardi@LPA3588:~$ sudo /rockchip-test/camera/camera_rkisp_test.sh
Start RKISP Camera Preview!
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Setting pipeline to PAUSED ...
...
Redistribute latency...
0:22:57.3 / 99:99:99.

../../_images/ahd-show.png

FAQ

How are the AHD camera pin definitions determined?

../../_images/ahd-spec.png

Why is there no image output from the AHD camera?

Basic Troubleshooting

  • Ensure the camera is at a resolution of 720/1080p@25/30fps.

  • Use the same resolution and frame rate for all 8 cameras; do not mix, e.g., AHD1 at 720p and AHD2 at 1080p.

  • Do not hot-swap.

  • If the firmware is self-compiled, ensure the SDK isCheck the power supply; use a DC 9-36V power source.

  • Test with Neardi’s matching camera, then compare with self-purchased cameras.

Image Capture Troubleshooting

Test with the v4l2-ctl tool for image capture:

AHD1 image capture
v4l2-ctl -d /dev/video11  --set-fmt-video=width=1920,height=1080,pixelformat=NV12  --stream-mmap=3  --stream-skip=3  --stream-to=/tmp/ahd.out  --stream-count=1  --stream-poll

Normal return result for image capture, otherwise it’s an exception:

<<<<

Is there a C++ demo?

Refer to neardi_cam_demo