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How to open a capture "pcap" file ?

Hi, I want to open a capture file that I made, and the file is a "pcap. file". I followed the method from https://answers.ros.org/question/213080/convert-raw-velodyne-vlp16-pcap-to-bagfile/ But, when I tried the command

$ rosrun velodyne_driver velodyne_node_model:=VLP16 _pcap:=/your/pcap/path/data.pcap _read_once:=true

then, I replace it by

$ rosrun velodyne_driver velodyne_node _model:=VLP16 _pcap:=/home/myt/下載/test.pcap _read_once:=true

but the result said

[ERROR] [1504151643.466623042]: unknown Velodyne LIDAR model: VLP16

Does anyone has any idea to solve the problem?