$ editcap -h
Editcap 1.1.4
Edit and/or translate the format of capture files.
See http://www.wireshark.org for more information.

Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]

<infile> and <outfile> must both be present.
A single packet or a range of packets can be selected.

Packet selection:
  -r                     keep the selected packets; default is to delete them.
  -A <start time>        don't output packets whose timestamp is before the
                         given time (format as YYYY-MM-DD hh:mm:ss).
  -B <stop time>         don't output packets whose timestamp is after the
                         given time (format as YYYY-MM-DD hh:mm:ss).

Duplicate packet removal:
  -d                     remove packet if duplicate (window == 5).
  -D <dup window>        remove packet if duplicate; configurable <dup window>
                         Valid <dup window> values are 0 to 1000000.
                         NOTE: A <dup window> of 0 with -v (verbose option) is
                         useful to print MD5 hashes.
  -w <dup time window>   remove packet if duplicate packet is found EQUAL TO OR
                         LESS THAN <dup time window> prior to current packet.
                         A <dup time window> is specified in relative seconds
                         (e.g. 0.000001).

           NOTE: The use of the 'Duplicate packet removal' options with
           other editcap options except -v may not always work as expected.
           Specifically the -r and -t options will very likely NOT have the
           desired effect if combined with the -d, -D or -w.

Packet manipulation:
  -s <snaplen>           truncate each packet to max. <snaplen> bytes of data.
  -C <choplen>           chop each packet at the end by <choplen> bytes.
  -t <time adjustment>   adjust the timestamp of each packet;
                         <time adjustment> is in relative seconds (e.g. -0.5).
  -E <error probability> set the probability (between 0.0 and 1.0 incl.)
                         that a particular packet byte will be randomly changed.

Output File(s):
  -c <packets per file>  split the packet output to different files
                         based on uniform packet counts
                         with a maximum of <packets per file> each.
  -i <seconds per file>  split the packet output to different files
                         based on uniform time intervals
                         with a maximum of <seconds per file> each.
  -F <capture type>      set the output file type; default is libpcap.
                         an empty "-F" option will list the file types.
  -T <encap type>        set the output file encapsulation type;
                         default is the same as the input file.
                         an empty "-T" option will list the encapsulation types.

Miscellaneous:
  -h                     display this help and exit.
  -v                     verbose output.
                         If -v is used with any of the 'Duplicate Packet
                         Removal' options (-d, -D or -w) then Packet lengths
                         and MD5 hashes are printed to standard-out.

      

$ editcap -F
editcap: option requires an argument -- F
editcap: The available capture file types for "F":
    libpcap - Wireshark/tcpdump/... - libpcap
    nseclibpcap - Wireshark - nanosecond libpcap
    modlibpcap - Modified tcpdump - libpcap
    nokialibpcap - Nokia tcpdump - libpcap
    rh6_1libpcap - RedHat 6.1 tcpdump - libpcap
    suse6_3libpcap - SuSE 6.3 tcpdump - libpcap
    5views - Accellent 5Views capture
    dct2000 - Catapult DCT2000 trace (.out format)
    nettl - HP-UX nettl trace
    netmon1 - Microsoft NetMon 1.x
    netmon2 - Microsoft NetMon 2.x
    ngsniffer - NA Sniffer (DOS)
    ngwsniffer_1_1 - NA Sniffer (Windows) 1.1
    ngwsniffer_2_0 - NA Sniffer (Windows) 2.00x
    niobserverv9 - Network Instruments Observer (V9)
    lanalyzer - Novell LANalyzer
    snoop - Sun snoop
    rf5 - Tektronix K12xx 32-bit .rf5 format
    visual - Visual Networks traffic capture
    k12text - K12 text file
    commview - TamoSoft CommView
    pcapng - Wireshark - pcapng (experimental)