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2015-07-07 10:02:21 -0500 commented answer Extract 60 fps image from bag file

Thanks buddy! rosbag info shows 20321 image messages, but image_view image extract gave me ~2k images. I solved it with a "--rate 0.05" option when play the bag file.

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2015-07-06 14:15:59 -0500 asked a question Extract 60 fps image from bag file

I have a bag file with a 60 fps camera image stream. I want to extract all the image frames. However, even if I specified _sec_per_frame to a very small value, I still got very low fps image files: there should be ~20k images for my 5min bag file, but now I only get ~2k images.

Here's the launch file I used:

  <node pkg="rosbag" type="play" name="rosbag" args="-d 2 /home/hangchu/MITLL/testTrackLoop_ii_2015-06-26-14-43-04.bag"/>
  <node name="extract" pkg="image_view" type="extract_images" respawn="false" cwd="node">
    <remap from="image" to="/camera/image_raw"/>
    <param name="filename_format" value="/home/hangchu/MITLL/images/frame%06i.jpg"/>
    <param name="_sec_per_frame" value="0.001"/>
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2015-07-06 14:09:45 -0500 answered a question Can't run gmapping

Just updated pthread and boost, problem solved...

2015-06-30 10:42:09 -0500 asked a question Can't run gmapping

I am running gmapping on ROS Indigo. I installed gmapping by

sudo apt-get install ros-indigo-gmapping
rosmake gmapping

When I run it, I followed this tutorial: However, when I run

rosrun gmapping slam_gmapping scan:=base_scan

I got this error:

slam_gmapping: tpp.c:62: __pthread_tpp_change_priority: Assertion `new_prio == -1 || (new_prio >= __sched_fifo_min_prio && new_prio <= __sched_fifo_max_prio)' failed.

Aborted (core dumped)

How can I solve this? Any help is much appreciated!