DART-MX8M CSI

DART-MX8M - Camera

Testing our MIPI cameras

Before you start any of below pipeline make sure you have camera connected. IMX family of processor uses gstreamer as multimedia framework. Please refer to https://gstreamer.freedesktop.org/

Camera Probe

Run below command to see if you have got the camera detected

root@imx8m-var-dart:~# v4l2-ctl --list-devices

This should output below

root@imx8m-var-dart:~# v4l2-ctl --list-devices
i.MX6S_CSI (platform:30a90000.csi1_bridge):
        /dev/video0

i.MX6S_CSI (platform:30b80000.csi2_bridge):
        /dev/video1

As you can see above there are 2 cameras accessible as /dev/video0 and /dev/video1

Testing Camera Loopback / Camera Preview on Display

In the examples below /dev/videoX is either /dev/video0 or /dev/video1

• For 640x480@30fps:

root@imx8m-var-dart:~# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=640,height=480 ! kmssink

• NTSC 720x480@30fps:

root@imx8m-var-dart:~# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=720,height=480 ! kmssink

• 720P 1280x720@30fps :

root@imx8m-var-dart:~# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=1280,height=720 ! kmssink

• For 1080P@30fps:

root@imx8m-var-dart:~# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=1920,height=1080 ! kmssink

• For QSXGA 2592x1944@15fps:

root@imx8m-var-dart:~# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=2592,height=1944 ! kmssink

Testing Camera JPEG Snapshot / Taking Single Picture

To Capture JPEG snapshot run any of below pipeline depending upon the resolution you want to take picture.

• For 640x480:

root@imx:~# gst-launch-1.0 imxv4l2videosrc device=/dev/video1  imx-capture-mode=0 num-buffers=1 ! jpegenc ! filesink location=/tmp/test.jpg

• NTSC 720x480:

root@imx:~# gst-launch-1.0 imxv4l2videosrc device=/dev/video1  imx-capture-mode=1 num-buffers=1 ! jpegenc ! filesink location=/tmp/test.jpg

• 720P 1280x720:

root@imx:~# gst-launch-1.0 imxv4l2videosrc device=/dev/video1  imx-capture-mode=2 num-buffers=1 ! jpegenc ! filesink location=/tmp/test.jpg

• For 1080P:

root@imx:~# gst-launch-1.0 imxv4l2videosrc device=/dev/video1  imx-capture-mode=3 num-buffers=1 ! jpegenc ! filesink location=/tmp/test.jpg

• For QSXGA 2592x1944:

root@imx:~# gst-launch-1.0 imxv4l2videosrc device=/dev/video1  imx-capture-mode=4 num-buffers=1 ! jpegenc ! filesink location=/tmp/test.jpg

Please note : jpegenc is opensource software based jpeg encoder. This gets executed on CPU not using JPEG hardware acceleration. To see your recently taken picture, transfer /tmp/test.jpg to your PC via scp or winscp and see whether you got correct snapshot or not.

References

You can find more examples in the GStreamer section.

Please note: IMX7 has different multimedia capabilities than IMX6. All the references mentioned above for GStreamer section should only be considered as examples. The pipelines may not work on IMX7 software stack.

For detailed camera training for IMX family refer to : http://cache.freescale.com/files/training/doc/ftf/2014/FTF-CON-F0119.pdf