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$ dltpy-print example.dlt 
[2020-09-29 19:34:12,059] - Will print file example.dlt with filters: []
filter len: 0
fwd filter len: 0
Traceback (most recent call last):
  File "/usr/local/bin/dltpy-print", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/dltpy/dltpy_print.py", line 47, in main
    for dm in dltf:
  File "/usr/local/lib/python3.7/dist-packages/dltpy/transforms/__init__.py", line 10, in apply_transforms
    for msg in it:
  File "/usr/local/lib/python3.7/dist-packages/dltpy/dltfile.py", line 171, in __iter__
    ret = self.get_next_message()
  File "/usr/local/lib/python3.7/dist-packages/dltpy/dltfile.py", line 165, in get_next_message
    m = DltMessage(self.rdr)
  File "/usr/local/lib/python3.7/dist-packages/dltpy/dltfile.py", line 70, in __init__
    self._load(reader)
  File "/usr/local/lib/python3.7/dist-packages/dltpy/dltfile.py", line 90, in _load
    self._raw_payload = bytes(reader.get_payload())
SystemError: Negative size passed to PyBytes_FromStringAndSize

$ dlt-convert -a example.dlt 
0 2020/09/12 19:05:40.644940    6244253 000 ECU1 DA1- DC1- control response N 1 [service(3842), ok, 02 00 00 00 00]
1 2020/09/12 19:05:40.645094    5701774 000 ECU1 DA1- DC1- control response N 1 [service(3842), ok, 01 00 00 00 00]
2 2020/09/12 19:05:40.645119    5701775 118 ECU1 DLTD INTM log info V 1 [Client connection #7 closed. Total Clients : 0]
3 2020/09/12 19:05:40.645151    5701906 119 ECU1 DLTD INTM log info V 1 [ApplicationID 'SINA' registered for PID 6063, Description=stdin adaptor application]
4 2020/09/12 19:05:40.645237    5701906 000 ECU1 DA1- DC1- control response N 1 [get_log_info, 07, 01 00 53 49 4e 41 01 00 53 49 4e 43 ff ff 15 00 73 74 64 69 6e 20 61 64 61 70 74 6f 72 20 63 6f 6e 74 65 78 74 19 00 73 74 64 69 6e 20 61 64 61 70 74 6f 72 20 61 70 70 6c 69 63 61 74 69 6f 6e 72 65 6d 6f]
5 2020/09/12 19:05:40.645297    5701907 000 ECU1 SINA SINC log info V 1 [Hello, world! ]