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

• 480P 640x480@30fps:

# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=640,height=480 ! kmssink

• NTSC 720x480@30fps:

# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=720,height=480 ! kmssink

• 720P 1280x720@30fps:

# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=1280,height=720 ! kmssink

• 1080P: 1920x1080@30fps:

# gst-launch-1.0 v4l2src device=/dev/videoX ! video/x-raw,width=1920,height=1080 ! kmssink

• QSXGA 2592x1944@15fps:

# 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 one of pipelines below depending upon the required picture resolution.

• 480P 640x480:

# gst-launch-1.0 v4l2src device=/dev/videoX num-buffers=1 ! video/x-raw,width=640,height=480   ! jpegenc ! filesink location=/tmp/test.jpg

• NTSC 720x480:

# gst-launch-1.0 v4l2src device=/dev/videoX num-buffers=1 ! video/x-raw,width=720,height=480   ! jpegenc ! filesink location=/tmp/test.jpg

• 720P 1280x720:

# gst-launch-1.0 v4l2src device=/dev/videoX num-buffers=1 ! video/x-raw,width=1280,height=720  ! jpegenc ! filesink location=/tmp/test.jpg

• 1080P 1920x1080:

# gst-launch-1.0 v4l2src device=/dev/videoX num-buffers=1 ! video/x-raw,width=1920,height=1080 ! jpegenc ! filesink location=/tmp/test.jpg

• QSXGA 2592x1944:

# gst-launch-1.0 v4l2src device=/dev/videoX num-buffers=1 ! video/x-raw,width=2592,height=1944 ! 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