How do I stream the output of a webcam on a YARP port?

[traversaro]

[traversaro]

If your webcam is supported by OpenCV, you can easily stream it on a YARP network using the opencv_grabber device. [1] [2]

First, make sure that you compiled YARP with OpenCV support, by making sure that the YARP_USE_OPENCV CMake advanced option is setted to ON.

Then you can check if the opencv_grabber device is available on your machine by using the yarpdev --list command.

If it is not available, you should enable its compilation in YARP by enabling the CREATE_DEVICE_LIBRARY_MODULES CMake option and then the ENABLE_yarpmod_opencv_grabber CMake option. After you enabled it, compile (and install, if you usually do install) YARP. Now you should find the opencv_grabber when you type yarpdev --list.

Now you can launch the device by using the following command:

yarpdev --device opencv_grabber

Now the video from the webcam should be streamed on the /grabber yarp port, but you can change the name of the port opened using the --name command line option.

The video streamed can be easily dumped to a mkv video file using the yarpdatadumper –addVideo option. [1]

[1] : http://www.yarp.it/group__opencv__grabber__basic.html
[2] : http://www.yarp.it/group__cmd__device__opencv__grabber.html

cc @fjandrad

[dcam0050]

install yarp with opencv_grabber

then do yarpdev --device opencv_grabber \nameOfPort

On 16 March 2016 at 08:31, Silvio Traversaro [email protected]
wrote:

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#104

[drdanz]

Another option is to use the ffmpeg_grabber device:

yarpdev --device ffmpeg_grabber --v4l2

[drdanz]

Yet another option... on linux the usbCamera device (from the robotology/icub-main repository) uses video4linux and therefore can be used to stream from a webcam:

yarpdev --device grabber --subdevice usbCamera --d /dev/video0

Thanks @barbalberto for this hint.