MX8 CSI: Difference between revisions
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{{note|Note: The parallel camera | {{note|Note: The parallel camera maximal frame rate at the 1920x1080 and 2592x1944 resolutions is 7.5fps|info}} | ||
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Revision as of 13:39, 11 November 2019
Testing MIPI-CSI2 cameras
Make sure you have the camera(s) connected to the board before booting it and running any of the pipelines below .
The i.MX family of SOCs uses gstreamer as a multimedia framework. Please refer to https://gstreamer.freedesktop.org/
Camera Probe
Run the following command to list the detected camera devices:
# 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 one camera accessible as /dev/video0, attached to the 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 are two cameras accessible as /dev/video0 and /dev/video1, both attached to the 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 sync=false
- NTSC (720x480):
# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=720,height=480 ! autovideosink sync=false
- 720p (1280x720):
# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! autovideosink sync=false
- 1080p (1920x1080):
# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1920,height=1080 ! autovideosink sync=false
- QSXGA (2592x1944):
# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=2592,height=1944 ! autovideosink sync=false
Testing Camera JPEG Snapshot
To capture a 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