Revision as of 17:03, 26 February 2019

DART-MX8M - 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

This should produce the following output

# 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 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 ! fpsdisplaysink

NTSC 720x480@30fps:

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

720P 1280x720@30fps:

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

1080P: 1920x1080@30fps:

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

QSXGA 2592x1944@15fps:

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

Testing Camera JPEG Snapshot

To capture JPEG snapshot run one of the 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

Using both cameras simultaneously

The following pipeline is an example of using both 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

@@ Line 1: / Line 1: @@
-{{PageHeader|DART-MX8M - Camera}} {{DocImage|category1=DART-MX8M|category2=Yocto}} __toc__
+<!-- Set release according to "release" parameter in URL and use RELEASE_MORTY_V1.0_DART-MX8M as default
-= Testing our MIPI cameras =
+--> {{#vardefine:RELEASE_PARAM|{{#urlget:release}}}} <!--
+--> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_MORTY_V1.0_DART-MX8M}}}} <!--
+--> {{PageHeader|DART-MX8M - Camera}} {{DocImage|category1=DART-MX8M|category2=Yocto}} __toc__
+= 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.
@@ Line 7: / Line 10: @@
 == Camera Probe ==
-Run the following command to see if you have got the camera detected
+Run the following command to see if you have the camera(s) detected
-  root@imx8m-var-dart:~# v4l2-ctl --list-devices
+  # v4l2-ctl --list-devices
-This should output below
+This should produce the following output
 <pre>
 # v4l2-ctl --list-devices

DART-MX8M CSI: Difference between revisions