The aim of this tool is to print instantaneous bitrate of the packets. The tool supports filters in libcap utils. 

The sample input 
<program_name> <tracefile/interface> <filter options>

Example
This program is installed as instantaneous_bitrate on the XPS (194.47.151.109)
Sample input
instantaneous_bitrate   trace-872-1.cap 

Sample output
<packet number> <Start time (relative)> <IAT (s)> <Packet_size (Bytes)> <Instantaneous Bitrate (bps)> 
1       0.000000000000  0.082802295500  138     13332.000000000000
2       0.082802295500  7.184316337250  70      77.000000000000
3       7.267118632750  0.191370546750  78      3260.000000000000
4       7.458489179500  0.098104238500  60      4892.000000000000
5       7.556593418000  0.043848931750  60      10946.000000000000

# This program can also be used as a debgging tool to print bitrates above threshold bitrate , and we can aslo control the number of samples to print

In the example below, we would like to print 10 samples above 100 Mbps in the test trace.

Sample Input
xvk@xrk-desktop:~/Instantaneous_bitrate$ instantaneous_bitrate trace-872-1.cap -m 10 -r 100e6
m flag controls the number of packets to print
r flag controls the threshold bitrate ( 100 Mbps in this case)

Sample Output
901     60.957002580000         0.000005304750  107     161364814.000000000000
4612    97.434359550250         0.000001549750  108     557509275.000000000000
5996    111.076648771750        0.000005483500  115     167776055.000000000000
6650    117.496746063000        0.000007033500  94      106916897.000000000000
7425    125.135586977000        0.000000178750  89      3983216785.000000000000
7441    125.297972917500        0.000004887500  106     173503836.000000000000
9062    141.297408163500        0.000001192000  107     718120805.000000000000
10606   156.412299692500        0.000002563000  108     337104955.000000000000
13163   181.594257056500        0.000002444000  95      310965630.000000000000
13613   186.053677976000        0.000002741750  106     309291510.000000000000