Shiqi's profile - activity

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2012-12-05 13:38:49 -0500	received badge	● Notable Question (source)
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2011-09-03 04:49:57 -0500	commented answer	Sequential number does NOT increase in rosbag Thanks Ken, so.. I really don't know what the possible reasons could be. I will try to use static /tf instead of the /erratic_player today and see if it works.
2011-09-03 04:42:08 -0500	commented question	Sequential number does NOT increase in rosbag Lorenz, each time I used 'rosbag play' I always put the '--clock' after the 'play' as you suggested. The '/use_sim_time' was also set to be true. Actually, I used the same method to run the bag downloaded from the tutorial, and it just worked perfect well.
2011-09-03 04:36:40 -0500	commented question	Sequential number does NOT increase in rosbag Eric, I did set the notifier to DEBUG, and that where the two MessageFilters come from.
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2011-09-02 14:55:03 -0500	asked a question	Sequential number does NOT increase in rosbag Hi, I am using an Erratic robot equipped with a Hokuyo laser sensor. The first thing I want to do is to get a map by gmapping. I did it in this way: Open a few terminals, set the simulated time and then start roscore roslaunch erratic_player erratic_base.launch rosrun hokuyo_node hokuyo_node rosrun erratic_teleop erratic_keyboard_teleop rosbag record -O mylaserdata /scan /tf After the recording finished, I close all of the above except roscore, start the gmapping, and then play the bag by: rosbag play --clock mylaserdata.bag I got nothing but a warning: warning: [1315017585.310852253, 1315016815.179267613]: MessageFilter [target=/odom ]: Dropped 100.00% of messages so far. Please turn the [ros.gmapping.message_notifier] rosconsole logger to DEBUG for more information. I checked by the rxconsole, and found something like the following repeatedly. MessageFilter [target=/odom ]: Added message in frame /base_laser at time 1315016811.038, count now 5 MessageFilter [target=/odom ]: Removed oldest message because buffer is full, count now 5 (frame_id=/base_laser, stamp=1315016810.938059) I believe there are some reason making the new-coming range information not instantly accepted. So I checked the messages from topics of /tf and /scan. I compared them with the messages from the downloaded bag, and found the "seq" number from /tf does not increase at all: always 0. I guess the reason that the laser readings are over buffered is just this number not increasing. I am new to the ROS community. Could anyone kindly tell me how to force the "seq" number growing? Thanks in advance. Shiqi Zhang