Thanks for your help -- writing to a bagfile works now --- I set it to
record right into my home directory to take care of any permissions
problems.
I still can't get gmapping to generate a map from a bagfile, though.
That too worked last week, before p2os_teleop. Now, when I run "rosbag
play <filename>" in conjunction with "rosrun gmapping slam_gmapping
scan:=scan" (or base_scan, if I'm using the downloaded bag file), this
error message is repeatedly displayed:

"[ WARN] [WallTime: 1279722421.991972640]:
TF_OLD_DATA ignoring data from the past for frame /base_link at time
1.27972e+09 according to authority /play_1279722419677246299
Possible reasons are listed at " <-- it doesn't display where these
possible reasons are listed.

Thanks again,
Rishi

Rishi Bedi
rbedi100@gmail.com



On Tue, Jul 20, 2010 at 1:36 PM, David Feil-Seifer
<david.feilseifer@gmail.com> wrote:
> p2os_teleop should not interfere with writing to a bagfile. Make sure
> that you have write permissions for the directory where the bagfile
> will be written, (this is not always the current directory, sometimes
> it is /opt/ros/ros or ~/ros/ros whereever the ros installation was
> done).
>
> On Tue, Jul 20, 2010 at 10:32 AM, Rishi Bedi <rbedi100@gmail.com> wrote:
>> Ya, I did that.
>> It may have something to do with the p2os_teleop package that I am
>> using -- could they be interfering? I installed the teleop package
>> after gmapping worked for me last Friday... so that's probably it...
>> any ideas on interference between the two?
>> Thanks
>> Rishi
>>
>>
>> Rishi Bedi
>> rbedi100@gmail.com
>>
>>
>>
>> On Tue, Jul 20, 2010 at 12:30 PM, Brian Gerkey <gerkey@willowgarage.com> wrote:
>>> hi Rishi,
>>>
>>> I just ran through that tutorial, downloading the linked bag, and it
>>> works fine for me.  Did you set the use_sim_time parameter (step 4)
>>> before starting gmapping (step 5)?
>>>
>>>        brian.
>>>
>>> On Tue, Jul 20, 2010 at 8:08 AM, Rishi Bedi <rbedi100@gmail.com> wrote:
>>>> Hi,
>>>> I'm trying to run the gmapping package, following the tutorial here:
>>>> http://www.ros.org/wiki/slam_gmapping/Tutorials/MappingFromLoggedData
>>>> .
>>>> I'm getting errors at a few points along the way, however -- when I
>>>> try to record my own bagfile from my Pioneer 2 (which I am
>>>> teleoperating using a joystick), I repeatedly get this error:
>>>> "[FATAL] [WallTime: 1279638142.894919030]: rosrecord::Record: could
>>>> not write to file.  Check permissions and diskspace" My diskspace is
>>>> definitely enough -- what permissions is it alluding to?
>>>>
>>>> I then tried just using the bagfile linked to in the tutorial, but
>>>> gmapping outputs the following, repeatedly: "[ WARN] [WallTime:
>>>> 1279638187.366396181]: TF_OLD_DATA ignoring data from the past for
>>>> frame /base_link at time 126.2 according to authority
>>>> /play_1279638095646529424". Using rosbag play to play the bagfile
>>>> appears to be working, but it shows this:
>>>> "RUNNING]  Bag Time:     35.500164   Duration: 0.900164 /
>>>> 1239670987.745222   " <-- it's counting by 1/10, so that looks too
>>>> big... it would take a while to count to that!
>>>>
>>>> Thanks,
>>>> Rishi
>>>>
>>>> Rishi Bedi
>>>> rbedi100@gmail.com
>>>> _______________________________________________
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>>>> https://code.ros.org/mailman/listinfo/ros-users
>>>>
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