[ros-users] rxbag Exception when viewing bag files with sensor_msgs/Image topics

[Tim Field]

This was fixed in visualization 1.2.1 which hasn't been released yet.  I
expect we'll release it today.

If you're in a hurry, you can apply the patch in the ticket you found.

Tim

On Fri, Nov 5, 2010 at 7:38 AM, Jolin Jia <pplin86 at gmail.com> wrote:

> Hi,
>
> When I run our camera data, and record the /cameraBumblebee2/left/Image_raw
> topic in the bag file. When I run the rxbag to see the image, I received
> this exception:
>
> -------------------------------------------------------error--------------------------------------------------------------------------
> $rxbag _2010-11-05-21-59-40.bag
> Error loading image on topic /cameraBumblebee2/left/image_raw: buffer is
> not long enough
> Exception in thread Thread-1:
> Traceback (most recent call last):
>   File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
>     self.run()
>   File "/opt/ros/cturtle/ros/tools/rxbag/src/rxbag/timeline_cache.py", line
> 95, in run
>     msg_stamp, item = self.loader(topic, stamp, item_details)
>   File
> "/opt/ros/cturtle/stacks/visualization/rxbag_plugins/src/rxbag_plugins/image_timeline_renderer.py",
> line 177, in _load_thumbnail
>     thumbnail_bitmap = image_helper.pil_to_cairo(thumbnail)
>   File
> "/opt/ros/cturtle/stacks/visualization/rxbag_plugins/src/rxbag_plugins/image_helper.py",
> line 117, in pil_to_cairo
>     return cairo.ImageSurface.create_for_data(data, cairo.FORMAT_ARGB32, w,
> h)
> TypeError: buffer is not long enough
>
> --------------------------------------------------------------------------------------------------------------------------------------------
> My system:
> Guest Ubuntu Lucid Lynx 10.04 and CTurtle binary install 1.2.x.
>
> Steps to reproduce:
> 1. rosrun our camera package
> 2. rosbag record /cameraBumblebee2/left/Image_raw
> 3. rxbag *.bag
> 4. View the "Image" of an Image topic
> 5. The images will not appear and the exception will be in the terminal
> where rxbag was launched from.
>
> And the image type is as following:
> height: 240
> width: 320
> encoding: rgb8
> is_bigendian: 0
> step: 960
>
> PS: When I use the another type of the image as follwing:
> height: 480
> width: 640
> encoding: bayer_bggr8
> is_bigendian: 0
> step: 640
> This kind of image can show in the rxbag tool.
>
> Why this happened? What's matter with it? And I found that somebody had
> this problem, an advised way is that "rgb8 format isn't being converted to
> RGBA format (needed by Cairo) when rgba argument is True. Removing lines
> 58-59 enables the image to display, but red and blue channels in example bag
> appear swapped." But this way is useless to me! Any help will be
> appreciated! Thanks in advanced!
>
>
>
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>
>
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