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2014-01-28 17:23:40 -0500 marked best answer how can rosbag write so fast on disk?

Hi there!

I made some test and I discovered that rosbag is able to record information at an impressive speed (I sent through the network several images (500x250 mono8) at ~29 MBps) and rosbag didn't miss anything. What are the techniques used by rosbag to make this possible?

Thanks.

2014-01-28 17:23:10 -0500 marked best answer What's the meaning of global in getGlobalCallbackQueue()?

Hi there!

Does the getGlobalCallbackQueue function return a pointer to a queue shared by all the nodes? or does it return a pointer to a queue intended global within the node?

Thanks a lot.

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2013-03-07 21:17:31 -0500 asked a question Notify changes to dynamic_reconfigure

Hi all!

is there a way to programmatically update parameters in the dynamic_reconfigure? I can modify the parameters of a node from the dynamic reconfigure but those parameters can possibly get modified also from other nodes at runtime, so I would like that these changes get reflected in the dynamic_reconfigure.

Thanks a lot.

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2012-05-17 23:25:24 -0500 asked a question ld: undefined reference to avformat_network_init@LIBAVFORMAT_53

Hi there!

I wrote a node that converts webcam images to ROS messages, I am using opencv but the linker yells:

/opt/ros/fuerte/lib/libopencv_highgui.so: undefined reference to `avformat_new_stream@LIBAVFORMAT_53'
/opt/ros/fuerte/lib/libopencv_highgui.so: undefined reference to `avformat_network_init@LIBAVFORMAT_53'

How do I overcome this problem? Thanks

2012-05-08 23:27:52 -0500 asked a question unable to install ros on ubuntu 12.04

Hi there!

I recently upgraded to ubuntu 12.04 but I am not able to install ros-fuerte. "apt-get install" yields:

Reading package lists... Done Building dependency tree
Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:

The following packages have unmet dependencies: ros-fuerte-desktop-full : Depends: ros-fuerte-slam-gmapping (= 1.2.7-s1336014066~oneiric) but it is not going to be installed Depends: ros-fuerte-simulator-gazebo (= 1.6.7-s1336006714~oneiric) but it is not going to be installed Depends: ros-fuerte-visualization (= 1.8.11-s1335981752~oneiric) but it is not going to be installed Depends: ros-fuerte-vision-opencv (= 1.8.2-s1335952329~oneiric) but it is not going to be installed Depends: ros-fuerte-perception-pcl (= 1.2.2-s1335953254~oneiric) but it is not going to be installed Depends: ros-fuerte-image-pipeline (= 1.8.2-s1335953718~oneiric) but it is not going to be installed Depends: ros-fuerte-stage (= 1.6.6-s1336041641~oneiric) but it is not going to be installed Depends: ros-fuerte-image-transport-plugins (= 1.8.0-s1335952476~oneiric) but it is not going to be installed Depends: ros-fuerte-visualization-tutorials (= 0.6.3-s1336026792~oneiric) but it is not going to be installed Depends: ros-fuerte-laser-pipeline (= 1.4.4-s1335976222~oneiric) but it is not going to be installed Depends: ros-fuerte-navigation (= 1.8.1-s1335992190~oneiric) but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

How can I overcome this problem? Thanks!

2012-03-15 09:58:58 -0500 commented answer roswtf ERROR Communication with [/foo] raised an error

Thanks for the link, even though it didn't help.

2012-03-15 09:54:40 -0500 commented question roswtf ERROR Communication with [/foo] raised an error

I defined all messages in one package and then imported this package where needed. Can this explain the weird behavior?

2012-03-05 05:48:27 -0500 commented answer roswtf ERROR Communication with [/foo] raised an error

everything runs on the same machine. The problem is still there. rxgraph build the graph correctly and I am able to rosping each node. I don't get any error when I start roscore and messages are successfully sent and received.