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Problem with bag file

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hii, I wrote a bagfile . when i do rosbag info i do get the topic list but the duration is zero sec.The start and end time are same. Here is the info listed path: record.bag version: 2.0 **duration: 0.0s** start: Jan 01 1970 05:53:37.58 (1417.58) end: Jan 01 1970 05:53:37.58 (1417.58) size: 3.8 GB messages: 20883 compression: none [1887/1887 chunks] types: geometry_msgs/PoseStamped [d3812c3cbc69362b77dc0b19b345f8f5] sensor_msgs/PointCloud2 [1158d486dd51d683ce2f1be655c3c181] topics: /gps_pose 7125 msgs : geometry_msgs/PoseStamped /lidar_2d 3028 msgs : sensor_msgs/PointCloud2 /lidar_3d 1886 msgs : sensor_msgs/PointCloud2 /lidar_four_plane_scanner_layer1 2211 msgs : sensor_msgs/PointCloud2 /lidar_four_plane_scanner_layer2 2211 msgs : sensor_msgs/PointCloud2 /lidar_four_plane_scanner_layer3 2211 msgs : sensor_msgs/PointCloud2 /lidar_four_plane_scanner_layer4 2211 msgs : sensor_msgs/PointCloud2 I wrote the rosbag file using rosbag class . Why is this error can anyone help me out.

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