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Bagfile (containing depth and RGB data) to picture frames

When I convert a bagfile (containing depth and RGB data) to picture frames, I get different number of picture frames each time I launch the code given in the tutorial given below and the subsequent...

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tf::TransformListener gets wrong tf

Hello, TL;DR tf::TransformListener gets a different transform than shown in RVIZ I am having quite a strange problem. I am using a rosbag file to playback recorded data and I am adding new transforms...

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Set RViz camera/view on fuerte

Hi, I'm writing a RViz plugin which allows the user to play rosbags and record them. During playing the rosbags I would like to make it possible to do a tracking shot in the scene. Therefore I have to...

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Logging and processing the same sensor data

Hi all, In my system I have a sensor that sends data via TCP/IP. This data should be logged for future processing and also used for a live computation at the same time. Since i am a newbie to ROS, I...

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The meaning of the frequency value in rosbags

Dear all, i downloaded a rosbag from the internet and looked at the info of this file: path: ../raw/Vehicle1_velodyne_pos.bag version: 2.0 duration: 36:10s (2170s) start: Aug 12 2015 09:22:18.17...

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How to add message field in a rosbag

I got a rosbag with a number of topics being played. I am interested in adding a Header (more specifically, a frame_id) to the message received so some 3d points in it are automatically displayed in...

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Understanding messages MDSum

I am trying to understand how the MD5Sum of the messages is being calculated following this [link](http://wiki.ros.org/ROS/Technical%20Overview#Message_serialization_and_msg_MD5_sums) So far, I...

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rosbag dies with MemoryError

Hi, I'm trying to use some large bag file. rosbag command dies with following error. I tried `rosbag reindex` also dies with same error. yasu@JO7UEB-VM-ROS:/media/sf_works/dataset/EuRoC$ rosbag info...

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how to let the node process rosbag twice

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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TF_OLD_DATA ignoring data from the past, when rosbag twice

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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Extracting compressed image data from bag file results in doubled up or...

Hi, I'm trying to extract compressed images from a bag file. Here is my launch file: This results in some frames not being saved and some frames being saves multiple times. Also a lot of frames are...

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Save specific data from a rosbag into an C++ array variable.

Hello, Currently I am working on a project and we need to extract msgs from a topic inside a rosbag file. Our first idea was to save all the msgs of the topic into a .txt and after that process that...

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How to import rosbag API into an C++ Project

Hello to all, Currently I am working on a project and we need to extract data from a bagfile and process it. After my research i found that the [rosbag API](http://wiki.ros.org/rosbag/Code%20API) could...

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ROS bags + Gazebo synchronization issue

Dear all, I'm having an issue currently on trying to record some ROS bags to replicate some robot movements during a Gazebo simulation. I'm starting to record the referred bags after I start my...

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tf from rosbag within node

Hello, i recorded 40 rosbags with my mobile base moving autonomously. I just recorded the tf-topic. If i play the bag from command line i can see the model of my base in rviz. So the bags are just...

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How to pass topic names as input argument in the command line terminal?

Hello ! I have a problem that states "Read a rosbag, to parse a topic, that is passed as an input argument" How do I pass the input argument using "rosrun" in the command line terminal? My code...

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Problem getting real-time_map using hector_slam!!!

'Hello all, I am using Xbox360, Ros Kinetic, Ubuntu 16.04LTS I am new to ROS. I want to map an unknown enviroment using kinect. For this I am using freenect and gmapping. I have done these steps: 1....

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using rosbag in callback

For my project I am interested in many frames of reference contained in a list called frame_list, each with Pose messages published to their own topic e.g. '*frame*_transform'. I am trying to subscribe...

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How to save video stream ?

I want to record video with a usb webcam to process it later. To do that, I found limited info. One is to use `rosbag` to save published topics. Another way is to use opencv to write video. Which...

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Does rosbag.write will overwrite the whole file ?

Nowdays I am using rosbag to save the msgs in my programs.I want to just change some of topic msgs in a saved bags, but keep the other msgs as what they once been.But when the program start, the first...

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