Jitter, packet loss and packet delay on tcpdump

Hello,
maybe you know that tcpdump has been back ported to
OpenWrt.
I need to measure jitter, packet loss and packet delay on
my
access point, but I can't use argus while it's not back
ported. The number of applications I can use are very
limitated, and the operation of back porting an application
to OpenWrt is quite difficult and can be very time
expensive.
Anyone can give me any informations to how post-analyze
this
parameters from tcpdump logs?
Thank you.

Gabriele
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