[ros-users] compressed_image_transport and old bag files

[Josh Faust]

First run "rosbag check" on the bag file to see if it has migration rules:
http://www.ros.org/wiki/rosbag#Check
Then if it says you can migrate it, run "rosbag fix":
http://www.ros.org/wiki/rosbag#Fix

If there's no migration path you'll have to delve a bit deeper into the bag
migration tools, which I'm not familiar with.

Josh

On Mon, Mar 8, 2010 at 7:59 PM, David Feil-Seifer <
david.feilseifer at gmail.com> wrote:

> OK, so I made some bag files a while back using the encode node from
> image_publisher package that has since been deprecated. These bag
> files have these images logged as sensor_msgs/CompressedImage under
> the topic /overhead_cam/image_color_compressed
>
> how would I make the image_subscriber tutorial subscribe to this topic
> correctly. I currently have the following error messages:
>
> /overhead_cam/image_color_compressed to have datatype/md5sum
> [sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version
> has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].
> Dropping connection.
> [ERROR] 1268106882.939315000: Client [/compressed_listener] wants
> topic /overhead_cam/image_color_compressed to have datatype/md5sum
> [sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version
> has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].
> Dropping connection.
> [ERROR] 1268106910.267165000: Client [/compressed_listener] wants
> topic /overhead_cam/image_color_compressed to have datatype/md5sum
> [sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version
> has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].
> Dropping connection.
>
> Do I have to upgrade the bag files in some way?
>
> Thanks in advance for your help.
>
>
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