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Hi all,
I find out that I can save an image by choosing File->Save Image in rviz.
What if I want to save images automatically with a constant rate? Anybody knows how to do this?
You should write a node which subscribes to the image stream and saves the images. Use the rate command so that it runs at a constant rate.
Or use Rosbag to save the image stream, although you won't get a constant stream then.
This would likely require changes in rviz source code. Another option is just recording the part of the screen you´re interested in with a external tool like ffmpeg.
To install the necessary packages:
sudo apt-get install ffmpeg libavcodec-extra-53
Recording the screen is then as easy as typing (for example)
ffmpeg -s 1920x1080 -f x11grab -r 30 -i :0.0+1920,0 -vcodec libx264 -vpre lossless_ultrafast -threads 0 video.mkv
By specifying the same parameters you used for setting the rviz window size as described here you could even largely automate things when putting them into a script.
Asked: 2014-02-20 18:07:46 -0500
Seen: 234 times
Last updated: Feb 20 '14
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