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

[Tim Field]

Thanks for the detailed bug report, William.  That really saves us time.

I've created a ticket here: https://code.ros.org/trac/ros-pkg/ticket/4415.

<https://code.ros.org/trac/ros-pkg/ticket/4415>Tim

On Wed, Sep 8, 2010 at 3:21 PM, William Woodall <wjwwood at gmail.com> wrote:

> When playing around with the ccny's Augmented Reality demos I viewed one of
> their provided bag files in rxbag and I received this exception:
>
> Error loading image on topic /usb_cam/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
>
> It seems to me that problem is to do with how the images are being loaded
> into cairo, or are a limitation of cario.
>
> My system:
> Guest Ubuntu Lucid Lynx 10.04 on a Host OS X Laptop:
> CTurtle binary install 1.2.x
> libcairo2-dev version 1.8.10-2ubuntu1
>
> Steps to reproduce:
> 1. Get the bag files for the ccny ar_pose demo, instructions:
> http://www.ros.org/wiki/ar_pose
> 2. roscd ar_pose/demo
> 3. rxbag usb_cam_topics_ar_multi.bag
> 4. Enable thumbnails
> Or
> 5. View the "Image" of an Image topic
> 6. The images will not appear and the exception will be in the terminal
> where rxbag was launched from.
>
> If I need to create a ticket for this let me know and I will.
>
> Thanks,
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> William Woodall
> Graduate Software Engineering
> Auburn University
> w at auburn.edu
> wjwwood at gmail.com
> 256-345-9938
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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