https://www.wireshark.org/docs/dfref///
这个里面的扩展功能还是很强大，可以帮着问题分析。支持大量的自定义化的字段读取功能，支持很多的协议。
https://www.wireshark.org/docs/dfref///f/frame.html
frame.time_delta Time delta from previous captured frame Time offset 1.0.0 to 4.4.6
frame.time_delta_displayed Time delta from previous displayed frame Time offset 1.0.0 to 4.4.6