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2016-03-18 10:04:33 -0500 asked a question subsampling rosbag images

Hello everyone, I got a problem by coping with the rosbag. I want to evaluate the SLAM performance in wide baseline. I got a rosbag, which is 50fps(frame per second) . The specific task is subsample the rosbag, make the fps to 25 or 20. Is there has some ways to modify the rosbag?