You can use tools in `rosbagmigration` to convert the format of your bag
file. This can convert the older messages into the new type.

http://www.ros.org/wiki/rosbagmigration

Kevin

On Mon, Mar 8, 2010 at 7:59 PM, David Feil-Seifer <
david.feilseifer@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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