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bag to csv

asked 2011-11-18 00:47:52 -0500

deathside gravatar image

updated 2011-11-18 00:48:57 -0500

I am doing this to grab a topic from my bag rostopic echo -p -b bagfile.bag /topic1 > topic1.txt

an example text file is this:

%time,field.axes0

1319232665843818430,0.0

1319232665893904494,0.0

is %time unix time? because I can't seem to convert it.

What I would like is to convert this to tell me the number of seconds from its start, so the bag starts with 0 time, this is to match the timestamp on an audiofile logged at the same time as this.

Thanks

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Comments

Seems like its the unix time at nanosecond level. You could trim of the last 9 digits if you dont care for sub-second accuracy.
Ben_S gravatar image Ben_S  ( 2011-11-22 04:05:40 -0500 )edit

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answered 2011-11-18 01:02:38 -0500

It's probably the easiest to use the Python API of rosbag. See this example for how to access the timestamp and here is a description for handling times with rospy.

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I am trying the cookbook python example and I am getting this... rosbag.bag.ROSBagUnindexedException: Unindexed bag
deathside gravatar image deathside  ( 2011-11-22 03:59:29 -0500 )edit
rosbag (the command line tool) has a reindex function, see "rosbag help"
Felix Endres gravatar image Felix Endres  ( 2011-11-23 00:21:16 -0500 )edit
I did the reindex. Still getting the same error. Please help
deathside gravatar image deathside  ( 2011-11-28 11:58:10 -0500 )edit
Have you tried to use the tip of Ben_S in the comment on your question?
Felix Endres gravatar image Felix Endres  ( 2011-12-01 22:24:24 -0500 )edit

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Asked: 2011-11-18 00:47:52 -0500

Seen: 2,301 times

Last updated: Nov 28 '11