Template:Linux-RK3399MIPICamera

1 Work with MIPI Camera OV13850 and MIPI WDR Camera OV4689 Under Linux

Hardware Setting: The Camera module can be connected to a MIPI port:

FriendlyELEC provides a test script "gst-camera.sh" to test a camera's functions. You can run it in a commandline to test picture taking and video recording.
You may try update this script to the lastest version by using the following commands:

cd /tmp/
git clone https://github.com/friendlyarm/gst-camera-sh.git
sudo cp gst-camera-sh/gst-camera.sh `which gst-camera.sh`

1.1 Options in "gst-camera.sh"

Options	Comment
--index or -i	Camera's index, it can be either 0 or 1. When two cameras are connected to a board you need to specify 1 to access the second camera.
--action or -a	Specify an action, it can be "preview" to preview, "photo" to take a picture or "video" to record video
--output or -o	Specify an output file to save a picture when taking a picture or video file when recording video
--verbose or -v	If it is specified as "yes" it will output the complete command when "gst-launch-1.0" is called
-x	Using the rkximagesink plugin, the preview image will be output to the X11 window for the FriendlyDesktop and Lubuntu systems
-k	Using the kmssink plugin, the preview image will be output directly to the screen for the FriendlyCore system

The script gst-camera.sh will automatically recognize OV13850 and OV4689 and pass the appropriate parameters to gst-launch-1.0.

1.2 Usage of gst-camera.sh

• Preview

gst-camera.sh --action preview

• Picture Taking

You can run the following command to take a picture and save it as a "1.jpg" file,

Camera	Command
OV13850	gst-camera.sh -a photo -o 1.jpg
OV4689	gst-camera.sh -a photo -o 1.jpg

• Preview and Record

You can run the following command to preview and record video and save your video to a "1.ts" file. Hardware encoding is activated when it is recording video.

gst-camera.sh --action video -output 1.ts

• Show Complete Command

If you add the "--verbose yes" option it will show a complete gsteamer command.

gst-camera.sh --action video --output 1.ts --verbose yes

Here is the complete gsteamer command you will see:

gst-launch-1.0 rkisp num-buffers=512 io-mode=4 path-iqf=/etc/cam_iq/${XMLFILE} \
    ! video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 \
    ! tee name=t t. ! queue ! kmssink t. ! queue ! mpph264enc \
    ! queue ! h264parse ! mpegtsmux ! filesink location=1.ts

The ${XMLFILE} variable may be rk-ov13850.xml or rk-ov4689.xml, depending on the camera model you are connected to.

1.3 gst-launch-1.0 parameter description

Preview ov13850 camera on FriendlyDesktop：

gst-launch-1.0 rkisp device=/dev/video0 sensor-id=1 io-mode=4 path-iqf=/etc/cam_iq/rk-rk-ov13850.xml ! video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! rkximagesink

Preview ov4689 camera on FriendlyDesktop：

gst-launch-1.0 rkisp device=/dev/video0 sensor-id=1 io-mode=4 path-iqf=/etc/cam_iq/rk-ov4689.xml ! video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! rkximagesink

Important parameters

parameter	description
device	If only one camera is connected, no matter which CSI interface is connected, the device (selfpath) used for preview is /dev/video0, and the device (mainpath) used for photographing is /dev/video2, if 2 cameras are connected at the same time. The camera nodes corresponding to the CSI1 interface are /dev/video0 and /dev/video2, and CSI2 corresponds to /dev/video4 and /dev/video6, Note: When taking pictures, io-mode needs to be specified as 1.
sensor-id	If only one camera is connected, the sensor-id is 1 regardless of which CSI interface is connected. If two cameras are connected at the same time, the camera of the CSI1 interface is 1, and the camera of the CSI2 interface is 5.
path-iqf	Specify the camera's tuning xml file. When the camera is OV4689, you need to specify /etc/cam_iq/rk-ov4689.xml. When the camera is OV13850, you need to specify /etc/cam_iq/rk-rk-ov13850.xml.
rkximagesink or kmssink	rkximagesink for FriendlyDesktop, will display on X11 window, kmssink for FriendlyCore, directly display on the screen

1.4 Camera application tutorial: Push video stream

Please refre this guide: RTMP-For-RK3399

1.5 Reference resource

http://blog.iotwrt.com/media/2017/10/01/camera/ http://www.360doc.com/content/16/1019/17/496343_599664458.shtml