ROS Answers: Open Source Q&A Forum

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recording only header image_raw message

March 2, 2019, 12:55 am

I would like to record using rosbag only the /usb_cam/image_raw/header topic excluding the data. Tried: rosbag record -a -x "/usb_cam1/image_raw/data" But looks like it is not working. I have more...

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How to build a map from a recording with gmapping

March 2, 2019, 3:07 am

I followed [this tutorial](http://wiki.ros.org/cn/slam_gmapping/Tutorials/MappingFromLoggedData) with the rosbag provided in the tutorial. Here is the map it produces: ![image...

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where can I find the video_player launch file for kinetic kame on ubuntu16.04

March 6, 2019, 1:50 am

I need the video player to record an video file and convert it into bag file format. Please help me with that.

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Rviz crashes on "ROS time moved backwards"

March 6, 2019, 1:50 am

Hi all, I am using ubuntu 14.04 with ros indigo. I am running rosbag play with --clock --loop, viewing it on rviz with pointcloud scenes I have recorded previously. I subscribe to the message output...

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enable/disable rosbag recording as a service

March 8, 2019, 4:05 pm

I need to enable/disable bag recording on our robot from a remote machine. Ideally as a ROS service. Does anybody have a recommendation for how this could be done? Is there any other good way to...

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AttributeError: 'module' object has no attribute 'Bag'

March 10, 2019, 11:12 pm

Program: import time, sys, os from ros import rosbag import roslib, rospy roslib.load_manifest('sensor_msgs') from sensor_msgs.msg import Image from cv_bridge import CvBridge import cv2 TOPIC =...

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ROSBag tools for windows

March 11, 2019, 9:59 am

I've noticed most of the toolchain offered by ROS is mostly python, and the most advanced tools seem to be available only for Linux. So I would like to know if there's any command line tool or EXE...

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Formatting rosbag data exported to .csv

March 11, 2019, 2:34 pm

I created a Rosbag of turtlesim data and would like to export the x and y coordinates only to a .csv file. Right now, however the formatting is as such: x y x y x y using this command to export to a...

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Formatting ROS data to .csv file

March 12, 2019, 12:36 pm

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Understanding rosbag timestamps

March 14, 2019, 7:58 am

Looking at the ROSbag.v2 specification, every message stored in a bag file is comprised of a: 1. Message Header 2. Message Content The header contains a connection ID and a TimeStamp. The content is...

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Using rosbag to get size of each topic

March 17, 2019, 8:47 am

I'm trying to remove unnecessary topics from a rosbag file to make it easier to distribute. In doing so, i'd like to know the size of each topic, not just the size of the bag file as a whole. However,...

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TF_OLD_DATA ignoring data from the past, when rosbag twice

November 21, 2018, 5:21 am

Hey everyone, Bascially, I use the rosnode to process rosbag to create my database, and I would like to feed rosbag to this node again, but the node just don't work and have the error msgs, Warning:...

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unindexed bag using RQT

March 21, 2019, 4:07 am

Dear all, I recorded a big bag file (around 240MB) using the RQT logging GUI. The publisher nodes are on a robot and the rqt is running on my PC. Due to un emergency I had to close RQT when the record...

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"Waiting for the map" when using map_server and rosbag

March 22, 2019, 8:57 am

Hello, I'm currently doing the tutorial [teb_local_planner](http://wiki.ros.org/teb_local_planner/Tutorials) and now I'm trying to build a map with this...

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Semantics of `%time` timestamp in `rostopic echo -p` from bagfile?

March 25, 2019, 3:05 am

When I print the topic data using `rostopic echo -p -b filename.bag /topic_name`, there are two timestamps in the output. One comes from the header of the message (third column: `field.header.stamp`),...

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Error in using pyrosbag?

March 26, 2019, 8:39 pm

Hello everyone I am trying make a bag file of rgb images and depth images that are saved in .mat file (h5py fomat), in Ubuntu 16.04 and ROS kinetic with pycharm IDE. import pyrosbag import h5py import...

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Storing rosbag::Bag in std::vector results in segfault

March 28, 2019, 8:08 am

I am attempting to store some `rosbag::Bag`s in a `std::vector`, but calling: std::vector bags; bags.push_back(rosbag::Bag()); results in the following segfault: #0 0x00007ffff62c7c6d in...

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Source for downloading rosbag files containing pointclouds

February 17, 2018, 1:33 am

Hey, Can anybody help me with the source from where I could download the rosbag file containing **point cloud data** ? It is very important . Please help!

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any provision in python to read .mat data and store it in rosbag file format?...

April 7, 2019, 11:56 pm

Hiii, I am trying to store signal data from avi into a .mat file and again to store the .mat data into bag file using python. Please help me with that.

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How to write python code to read pointcloud data from a bag file and display...

April 15, 2019, 2:03 am

I've a bag file. I need to write a Python Application which reads that bag file and display on RVIZ. but i'm not finding any RVIZ APIs tutorial to use. Could you please help me how to proceed in this...

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