calibre

Problem converting djvu

Bug #1807577 reported by Karlis on 2018-12-09

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	calibre	Invalid	Undecided	Unassigned

Bug Description

I can't convert a djvu file to other file formats. Tried pdf, mobi, epub.
Running 3.35.0 and windows 10 (Installed not on the os drive, but other conversions have worked as expected)

calibre, version 3.35.0 (win32, embedded-python: True)
Conversion error: Failed: Convert book 1 of 1 (book name)

Convert book 1 of 1 ()
Conversion options changed from defaults:
  read_metadata_from_opf: u'C:\\Users\\snip\\AppData\\Local\\Temp\\calibre_kylgne\\nzvw_e.opf'
  output_profile: 'kindle_pw3' (Although here it is pw3, I have tried default also)
  verbose: 2
Resolved conversion options
calibre version: 3.35.0

last lines

InputFormatPlugin: DJVU Input running
on C:\Users\snip\AppData\Local\Temp\calibre_kylgne\ue3tq4.djvu
Python function terminated unexpectedly
  unpack requires a string argument of length 4 (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 101, in main
  File "site.py", line 78, in run_entry_point
  File "site-packages\calibre\utils\ipc\worker.py", line 199, in main
  File "site-packages\calibre\gui2\convert\gui_conversion.py", line 42, in gui_convert_override
  File "site-packages\calibre\gui2\convert\gui_conversion.py", line 27, in gui_convert
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 1106, in run
  File "site-packages\calibre\customize\conversion.py", line 244, in __call__
  File "site-packages\calibre\ebooks\conversion\plugins\djvu_input.py", line 29, in convert
  File "site-packages\calibre\ebooks\djvu\djvu.py", line 118, in __init__
  File "site-packages\calibre\ebooks\djvu\djvu.py", line 56, in __init__
  File "site-packages\calibre\ebooks\djvu\djvu.py", line 56, in __init__
  File "site-packages\calibre\ebooks\djvu\djvu.py", line 40, in __init__
struct.error: unpack requires a string argument of length 4