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2017-03-14 08:50:29 -0500 commented answer How to extract data from *.bag?

I tried the "rostopic echo -b file.bag -p /topic > data.txt" but I am getting a blank txt file " and i am not able to observe any output with the command "rostopic echo -b file.bag -p /topic.

2016-09-09 02:40:34 -0500 commented question How to extract data from *.bag?

The script worked well for me, but I didn't test for a bunch of different bags. I'd imagine it wouldn't work if the bag contains data of a type that is not just a simple number