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I'm not sure that's the appropriate way to use the rosbag API to read messages from one bag file and write them to another.

The last time I did this, my code looked something like:

rosbag::Bag output("output.bag", rosbag::bagmode::Write);

rosbag::Bag input("input.bag");
rosbag::View view(input, rosbag::TopicQuery("numbers"));

BOOST_FOREACH(rosbag::MessageInstance const m, view)
{
    output.write(m.getTopic(), m.getTime(), m, m.getConnectionHeader());
}

output.close();
input.close();