#!/usr/bin/env python
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from __future__ import print_function

import rosbag

def fastrebag(inbag, outbag):
    rebag = rosbag.Bag(outbag, 'w')
    for i, (topic, msg, t) in enumerate(rosbag.Bag(inbag).read_messages(raw=True)):
        rebag.write(topic, msg, t, raw=True)
    rebag.close()

if __name__ == '__main__':
    import sys
    if len(sys.argv) == 3:
        fastrebag(sys.argv[1], sys.argv[2])
    else:
        print('usage: fastrebag.py <inbag> <outbag>')