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How to record bagfile within launch file

asked 2017-01-09 04:42:45 -0600

baozhang gravatar image

I would like to record some topics via launch file.

<launch>

<!-- record topics listed below -->
<arg name="topics_name" default="joint_states /usb_cam/left/image_raw"/>

<!-- record topics -->
<node name="record_topics_for_verification" pkg="rosbag" type="record"
      args="$(arg topics_name)"/>

</launch>

This code runs without any errors, however, there is no recorded bagfile in current directory.

Does anyone know the reason?

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answered 2017-01-09 05:50:38 -0600

DavidN gravatar image

updated 2017-01-09 05:50:57 -0600

By default, the bag file will be in ~/.ros folder with the name being the date and time of starting recording. For exact name, you can add this flag output="screen" so it looks like this

<node name="record_topics_for_verification" pkg="rosbag" type="record" args="$(arg topics_name)" output="screen"/>

After adding this flag, you will see the bag name in rosout after you launch.

Note: the bag file will have the name of xxx.bag.active while being recording. Only after you properly terminate the recording node, the file name will be changed to xxx.bag

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Thank you for replying.

I found recorded bagfiles in ~/.ros folder.

Do you know how to change the folder to record bagfiles?

baozhang gravatar imagebaozhang ( 2017-01-09 21:28:41 -0600 )edit

You can add -o in args list. Follow this: http://answers.ros.org/question/10612...

DavidN gravatar imageDavidN ( 2017-01-09 21:48:24 -0600 )edit

Thank you for your kindness. My question was solved!

baozhang gravatar imagebaozhang ( 2017-01-10 09:18:50 -0600 )edit

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Asked: 2017-01-09 04:42:45 -0600

Seen: 1,370 times

Last updated: Jan 09 '17