The bug has been fixed in the ROS 1.1 and 1.0 development branches. It will
be available in the next releases.

 - Ken

On Wed, Jun 9, 2010 at 7:31 AM, Jeremy Leibs <leibs@willowgarage.com> wrote:

> Agreed.  I was also surprised to find it didn't print bag time.  I
> created ticket: https://code.ros.org/trac/ros/ticket/2780 to track
> this issue.
>
> On Wed, Jun 9, 2010 at 2:14 AM, Miguel Prada <miguel.register@gmail.com>
> wrote:
> > Hi Jeremy,
> >
> > Thanks for the tip. That's exactly what I've been doing after writing to
> the list and it works great.
> >
> > However, shouldn't rostopic output the bagfile's timestamps when echoing
> from a bagfile? I find it much more reasonable than having to
> programatically read the data using python to achieve this result. Am I
> missing some important reason for rostopic echo to behave this way?
> >
> > Miguel.
> >
> > El 09/06/2010, a las 10:33, Jeremy Leibs escribió:
> >
> >> Assuming you are still using boxturtle, rosrecord has a rosrecord.py
> >> programmatic API
> >>
> >> Take a look at:
> >>
> >> http://www.ros.org/wiki/rosrecord#rosrecord.py
> >>
> >> It should be fairly straight forward to write a small program which
> >> opens the bag and prints exactly what you want.
> >>
> >> On Wed, Jun 9, 2010 at 1:29 AM, Miguel Prada <miguel.register@gmail.com>
> wrote:
> >>> Hi,
> >>>
> >>> I want to manipulate some data from a bag file with a spreadsheet. I'm
> exporting from the bag to CSV using 'rostopic echo -p -b BAGFILE TOPIC >>
> file.csv' but I just realised that the time field you get from doing that is
> the time corresponding to when rostopic is run, not the time stored in the
> bag file. That means that if I use this method to output messages in one
> topic and then repeat for another topic (e.g. controller commands and robot
> positions) the time fields on both CSV files are of no use at all to merge
> the data in those two files.
> >>>
> >>> I tried using 'rostopic echo -p -b BAGFILE -a >> file.csv' to print all
> topics at once, but the output is quite messed up and doesn't clearly state
> which data corresponds to which topic.
> >>>
> >>> Does anyone have any suggestion on how should I proceed with this?
> >>>
> >>> Miguel.
> >>>
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