'JPEG compression requires 8-bit, 1/3-channel images' error since Fuerte

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I developed an application based on the old RVIZ (wxWidgets) and I have a tool that takes an OgreImage (from a video feed) and publishes on a different topic as a screenshot. I use a standard image_transport publisher.

In Diamondback, the listener could choose between raw, compressed, and theora. In Fuerte, only raw works.

On the publisher side, I get the following error with compressed: Compressed Image Transport - JPEG compression requires 8-bit, 1/3-channel images (input format is: rgba8)

I'm wondering if some format support was removed in Fuerte, since this used to work. Here is my code:

void PhotoTool::publishImageToROS(const Ogre::Image& ogreImage, const std::string& referenceFrame)
            {
                sensor_msgs::Image rosImage;

                static int seq = 0;

                rosImage.header.seq = seq++;
                rosImage.header.frame_id = referenceFrame;
                rosImage.header.stamp = ros::Time::now();
                rosImage.height = ogreImage.getHeight();
                rosImage.width = ogreImage.getWidth();
                rosImage.encoding = "rgba8";
                rosImage.is_bigendian = false;
                rosImage.step = ogreImage.getRowSpan();
                size_t size = rosImage.step * rosImage.height;
                rosImage.data.resize(size);

                // Copies the data from the Ogre Image to the ROS Image
                memcpy((char*) (&rosImage.data[0]), ogreImage.getData(), size);

                publisher.publish(rosImage);
            }