First run &quot;rosbag check&quot; on the bag file to see if it has migration rules: <a href="http://www.ros.org/wiki/rosbag#Check">http://www.ros.org/wiki/rosbag#Check</a><br>Then if it says you can migrate it, run &quot;rosbag fix&quot;: <a href="http://www.ros.org/wiki/rosbag#Fix">http://www.ros.org/wiki/rosbag#Fix</a><br>

<br>If there&#39;s no migration path you&#39;ll have to delve a bit deeper into the bag migration tools, which I&#39;m not familiar with.<br><br>Josh<br><br><div class="gmail_quote">On Mon, Mar 8, 2010 at 7:59 PM, David Feil-Seifer <span dir="ltr">&lt;<a href="mailto:david.feilseifer@gmail.com">david.feilseifer@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">OK, so I made some bag files a while back using the encode node from<br>
image_publisher package that has since been deprecated. These bag<br>
files have these images logged as sensor_msgs/CompressedImage under<br>
the topic /overhead_cam/image_color_compressed<br>
<br>
how would I make the image_subscriber tutorial subscribe to this topic<br>
correctly. I currently have the following error messages:<br>
<br>
/overhead_cam/image_color_compressed to have datatype/md5sum<br>
[sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version<br>
has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].<br>
Dropping connection.<br>
[ERROR] 1268106882.939315000: Client [/compressed_listener] wants<br>
topic /overhead_cam/image_color_compressed to have datatype/md5sum<br>
[sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version<br>
has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].<br>
Dropping connection.<br>
[ERROR] 1268106910.267165000: Client [/compressed_listener] wants<br>
topic /overhead_cam/image_color_compressed to have datatype/md5sum<br>
[sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version<br>
has [sensor_msgs/CompressedImage/8f7a12909da2c9d3332d540a0977563f].<br>
Dropping connection.<br>
<br>
Do I have to upgrade the bag files in some way?<br>
<br>
Thanks in advance for your help.<br>
<br>
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