rosbag record never finalized

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Hi all, i am new with ROS and I had the exiting challenge to build a lidar point cloud with a velodyne vlp-16.

I record my pacp file with tshark and now im in the ROS part. With a lot of help in this forum i achieve starting roscore and also reading the pcap file with the velodyne driver. My target is to get a .LAS file. After a couple of sample i figure that i had to convert my pcap to bag file in the process.

If at this point i'm not on the good way plz let me know :)

After many try i finaly got the recording with this:

rosrun rosbag record /velodyne_packets -O /media/lidar/math/test13.bag

[ INFO] [1512235521.473606088]: Subscribing to /velodyne_packets
[ INFO] [1512235521.542149460]: Recording to /media/lidar/math/test13.bag.

The problem is... it never ending. I can't figure what to do.

Any help is welcome, thank you