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→USB camera test
<li><p>First insert the USB camera into the USB port of the Orange Pi development board</p></li>
<li><p>Then through the lsmod command, you can see that the kernel has automatically loaded the following modules</p>
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<p>orangepi@orangepi:~$ '''lsmod'''</p>
<pspan style="margin-right: 100px;">Module </span><span style="margin-right: 50px;">Size </span><span style="margin-right: 45px;">Used by</pspan><br><pspan style="margin-right: 100px;">'''uvcvideo </span><span style="margin-right: 50px;">106496 </span><span style="margin-right: 50px;">0'''</pspan><br>|}</li><li><p>3) Through the v4l2-ctl command, you can see that the device node information of the USB camera is /dev/video0</p>{| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepi:~$ '''sudo apt update'''</p>
<p>orangepi@orangepi:~$ '''sudo''' '''apt install -y v4l-utils'''</p>
<p>orangepi@orangepi:~$ '''v4l2-ctl --list-devices'''</p>
<p>USB 2.0 Camera (usb-sunxi-ehci-1):</p>
:<p>/dev/video0</p>|}{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big><p>'''Note that the l in v4l2 is a lowercase letter l, not the number 1.'''</p><p>'''In addition, the serial number of the video is not necessarily video0, please refer to what you actually see.'''</p></big>|}</li>
<li><p>Use fswebcam to test the USB camera</p>
<ol style="list-style-type: lower-alpha;">
<li><p>Install fswebcam</p>
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<p>orangepi@orangepi:~$ '''sudo''' '''apt update'''</p>
<p>orangepi@orangepi:~$ '''sudo apt-get install -y fswebcam'''</p>|}</li><li><p>After installing fswebcam, you can use the following command to > take pictures</p><ol style="list-style-type: lower-alphanone;"><li><p>a) -d option is used to specify the device node of the USB > camera</p></li><li><p>b) --no-banner is used to remove the watermark of the photo</p></li><li><p>c) -r option is used to specify the resolution of the photo</p></li><li><p>d) -S option is used to set the number of previous frames to > skip</p></li><li><p>e) ./image.jpg is used to set the name and path of the > generated photo</p>{| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepi:~$ '''sudo''' '''fswebcam -d /dev/video0 \'''</p>
<p>'''--no-banner -r 1280x720 -S 5 ./image.jpg'''</p>|}</li></ol>
</li>
<li><p>In the server version of the linux system, you can use the scp > command to transfer the taken pictures to the Ubuntu PC for > mirror viewing after taking pictures</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''scp image.jpg [mailto:test@192.168.1.55:/home/test test@192.168.1.55:/home/test] (Modify the IP address and path according to the actual situation)'''</p>|}</li><li><p>In the desktop version of the linux system, you can directly > view the captured pictures through the HDMI display</p></li></ol>
</li>
<li><p>Use mjpg-streamer to test USB camera</p>
<ol style="list-style-type: lower-alpha;">
<li><p>Download mjpg-streamer</p>
<ol style="list-style-type: lower-alphanone;"><li><p>a) Github download address:</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''git clone https://github.com/jacksonliam/mjpg-streamer'''</p>|}</li><li><p>b) The image download address of Gitee is:</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''git clone https://gitee.com/leeboby/mjpg-streamer'''</p>|}</li></ol>
</li>
<li><p>Install dependent packages</p>
<ol style="list-style-type: lower-alphanone;"><li><p>a) Ubuntu system</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''sudo apt-get install -y cmake libjpeg8-dev'''</p>|}</li><li><p>b) Debian system</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''sudo apt-get install -y cmake libjpeg62-turbo-dev'''</p>|}</li></ol>
</li>
<li><p>Compile and install mjpg-streamer</p>
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<p>orangepi@orangepi:~$ '''cd mjpg-streamer/mjpg-streamer-experimental'''</p>
<p>orangepi@orangepi:~/mjpg-streamer/mjpg-streamer-experimental$ '''make -j4'''</p>
<p>orangepi@orangepi:~/mjpg-streamer/mjpg-streamer-experimental$ '''sudo make install'''</p>|}</li>
<li><p>Then enter the following command to start mjpg_streamer</p>
{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big><p>'''Note that the serial number of the video is not necessarily video0, please refer to what you actually see.'''</p></big>|} {| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepi:~/mjpg-streamer/mjpg-streamer-experimental$ '''export LD_LIBRARY_PATH=.'''</p>
<p>orangepi@orangepi:~/mjpg-streamer/mjpg-streamer-experimental$ '''sudo ./mjpg_streamer -i "./input_uvc.so -d \'''</p>
<p>'''/dev/video0 -u -f 30" -o "./output_http.so -w ./www"'''</p>|}</li><li><p>Then enter '''[the IP address of the development board: 8080]''' > in the browser of the Ubuntu PC or Windows PC or mobile phone > on the same LAN as the development board to see the video > output by the camera</p>
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