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I'm pretty new to ros, and I'd like to record the view of a turtlebot as it moves around. I want to do it by a python or cpp script, so, not like that: http://learn.turtlebot.com/2015/02/04/4/
Any ideas about how to do it or where to start?
Where to start:
Look at the source for the video_recorder node in the image_view package (which is what is used in the tutorial that you linked to). You'll notice that cv::VideoWriter from OpenCV is used. Next, checkout the API for the cv::VideoWriter class. This should be a good start for you.
You can also look at rosbag. It allows you to record any topic in the bag format. If you are publishing the video on a specific topic you can record that using command line via rosbag record <video/topic>
Moreover, depending on the writing speed of the disk, rosbag may discard the data it needs to write. In such cases, it is suggested to increase the buffer size using rosbag record -b <buffer number in MB> <video/topic>. You can check all the available command line arguments in rosbag command line.
Since it is a command line you always run this using a script and run in even in a remote system. Hope this helps!
Asked: 2017-06-28 17:30:52 -0500
Seen: 1,134 times
Last updated: May 30 '18
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