How to stream video using LinkIt Smart 7688 Duo and a USB webcam

This is a quick summary of how to stream video using a USB webcam attached to LinkIt Smart 7688 Duo. The webcam used is Logitech C905.

Method - 1

1. Plug-in the USB camera to LinkIt Smart 7688 Duo.

2. Login to the Web UI then go to "Services" -> "MJPG-streamer".

3. Select "Enable MJPG-streamer" then click on "Save & Apply".

4. The image captured by the USB camera will be display. Note that it's a snapshot.

5. To view the video, launch a web browser and enter the IP address assigned to LinkIt Smart 7688 Duo follow by ":8080".

Method - 2

1. Login to OpenWRT using Putty.

2. Check whether mjpg_streamer is installed.

root@mylinkit:~# mjpg_streamer -h
-----------------------------------------------------------------------
Usage: mjpg_streamer
  -i | --input "<input-plugin.so> [parameters]"
  -o | --output "<output-plugin.so> [parameters]"
 [-h | --help ]........: display this help
 [-v | --version ].....: display version information
 [-b | --background]...: fork to the background, daemon mode
-----------------------------------------------------------------------
Example #1:
 To open an UVC webcam "/dev/video1" and stream it via HTTP:
  mjpg_streamer -i "input_uvc.so -d /dev/video1" -o "output_http.so"
-----------------------------------------------------------------------
Example #2:
 To open an UVC webcam and stream via HTTP port 8090:
  mjpg_streamer -i "input_uvc.so" -o "output_http.so -p 8090"
-----------------------------------------------------------------------
Example #3:
 To get help for a certain input plugin:
  mjpg_streamer -i "input_uvc.so --help"
-----------------------------------------------------------------------
In case the modules (=plugins) can not be found:
 * Set the default search path for the modules with:
   export LD_LIBRARY_PATH=/path/to/plugins,
 * or put the plugins into the "/lib/" or "/usr/lib" folder,
 * or instead of just providing the plugin file name, use a complete
   path and filename:
   mjpg_streamer -i "/path/to/modules/input_uvc.so"
-----------------------------------------------------------------------

3. Launch mjpg_streamer

root@mylinkit:~# mjpg_streamer -i "input_uvc.so -d /dev/video0 -r 640x480 -f 25"

 -o "output_http.so -p 8080 -w /www/webcam"

MJPG Streamer Version: svn rev: exported

 i: Using V4L2 device.: /dev/video0

 i: Desired Resolution: 640 x 480

 i: Frames Per Second.: 25

 i: Format............: JPEG

 i: TV-Norm...........: DEFAULT

 o: www-folder-path...: /www/webcam/

 o: HTTP TCP port.....: 8080

 o: username:password.: disabled

 o: commands..........: enabled

4. Check the result

Launch a web browser, enter the IP address of LinkIt Smart 7688 Duo and add the ":8080" to the end. For my setting, I entered 192.168.2.5:8080.

To stop mjpg_streamer, hit "ctrl-c" in putty terminal.

Note, 

The MJPG-streamer option in the administration console doesn't need to be enabled for Method - 2 to work.

Reference:

Webcam streaming with LinkIt Smart 7688

https://youtu.be/2cTc51pYU7I