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Hello,

You were not doing anything wrong but it was because the code is just out dated.

Instead of using rosbridge to stream a image topic through video, I would recommend to use mjpeg_server to stream a image topic to the web. It provides more promising way to transport image to web.

Check out http://www.ros.org/wiki/mjpeg_server

If you like to use Procesingjs capability on top of video stream, You can use MJPEG camera example, which requires both mjpeg_server and rosbridge.

Regards, Jihoon