#ROSBAG V2.0 Echunk_count=conn_count=index_pos={op= ) size=compression=noneop=(topic=constants conn=op=topic=constants0message_definition=int32 CONSTANT=1 int32 value 'md5sum=06a34bda7d4ea2950ab952e89ca35d7atype=test_rosbag/Constants& time= conn=op=/ count=ver= conn=op= (topic=constants conn=op=topic=constants0message_definition=int32 CONSTANT=1 int32 value 'md5sum=06a34bda7d4ea2950ab952e89ca35d7atype=test_rosbag/Constantsd count=ver=start_time=chunk_pos=end_time=op=