MX8 CSI

Camera

Testing MIPI-CSI2 cameras

Before running any of the pipelines below make sure you have camera(s) connected. i.MX family of processors uses gstreamer as multimedia framework. Please refer to https://gstreamer.freedesktop.org/

Camera Probe

Run the following command to see if you have the camera(s) detected

# v4l2-ctl --list-devices

On VAR-SOM-MX8 it should produce the following output

# v4l2-ctl --list-devices
vpu B0 (platform:):
        /dev/video12
        /dev/video13

mxc-isi (platform:58100000.isi.0):
        /dev/video0
        /dev/video1

mxc-jpeg decoder (platform:58400000.jpegdec):
        /dev/video2

mxc-jpeg decoder (platform:58450000.jpegenc):
        /dev/video3

There is 1 camera accessible as /dev/video0, attached to VAR-EXT-CB8 expansion board.

On SPEAR-MX8 this should produce the following output:

# v4l2-ctl --list-devices
vpu B0 (platform:):
        /dev/video12
        /dev/video13

mxc-isi (platform:58100000.isi.0):
        /dev/video0
        /dev/video2

mxc-isi (platform:58140000.isi.4):
        /dev/video1

mxc-jpeg decoder (platform:58400000.jpegdec):
        /dev/video3

mxc-jpeg decoder (platform:58450000.jpegenc):
        /dev/video4

There is 2 cameras accessible as /dev/video0 and /dev/video1, both attached to VAR-EXT-CB8 expansion board.

Testing Camera Preview on Display

In the examples below /dev/video1 can be used instead of /dev/video0 on boards with 2 cameras.

• 480P 640x480:

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480 ! autovideosink

• NTSC 720x480:

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=720,height=480 ! autovideosink

• 720P 1280x720:

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! autovideosink

• 1080P: 1920x1080:

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1920,height=1080 ! autovideosink

• QSXGA 2592x1944:

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=2592,height=1944 ! autovideosink

Testing Camera JPEG Snapshot

To capture JPEG snapshot run one of the pipelines below depending upon the required picture resolution.

In the examples below /dev/video1 can be used instead of /dev/video0 on boards with 2 cameras.

• 480P 640x480:

# gst-launch-1.0 v4l2src device=/dev/video0 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/video0 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/video0 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/video0 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/video0 num-buffers=1 ! video/x-raw,width=2592,height=1944 ! jpegenc ! filesink location=/tmp/test.jpg

Using 2 cameras simultaneously

The following pipeline is an example of using 2 cameras simultaneously.
In this example a short video stream from each camera is saved as an MJPEG-encoded AVI file.

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi \
                 v4l2src device=/dev/video1 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test1.avi