azw4 to pdf failure

[rdsk]

Hi, I need to convert a file from azw4 to pdf but it fails with below message but I cant make out why its failed. Thanks for your help in advance:

Spoiler:

calibre, version 5.31.1 (win32, embedded-python: True)
Conversion error: Failed: Convert book 1 of 1 (Mathematics at the Meridian (Chapman & Hall/CRC Numerical Analysis and Scientific Computing Series))

Convert book 1 of 1 (Mathematics at the Meridian (Chapman & Hall/CRC Numerical Analysis and Scientific Computing Series))
DeDRM v7.2.1: Trying to decrypt 2kwoy72e.mobi
Using Library AlfCrypto DLL/DYLIB/SO
Using Library AlfCrypto DLL/DYLIB/SO
MobiDeDrm v1.0.
Copyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.
Decrypting Mobipocket 4 ebook: Mathematics at the Meridian (Chapman & Hall/CRC Numerical Analysis and Scientific Computing Series)
Got DSN key from database D025A0A0242203QQ
Found 10 keys to try after 0.2 seconds
Crypto Type is: 0
This book is not encrypted.
Decryption succeeded after 0.2 seconds
DeDRM v7.2.1: Finished after 0.2 seconds
Conversion options changed from defaults:
pdf_sans_family: 'MS Shell Dlg 2'
cover: 'C:\\Users\\ruper\\AppData\\Local\\Temp\\calibre_7 r4bnwo6\\ubryop4v.jpeg'
verbose: 2
pdf_serif_family: 'MS Shell Dlg 2'
read_metadata_from_opf: 'C:\\Users\\ruper\\AppData\\Local\\Temp\\calibre_7 r4bnwo6\\klqj5jva.opf'
output_profile: 'generic_eink'
Resolved conversion options
calibre version: 5.31.1
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': 'original',
'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
"'\\s*((chapter|book|section|part)\\s+)|((prolog|p rologue|epilogue)(\\s+|$))', "
"'i')) or @class = 'chapter']",
'chapter_mark': 'pagebreak',
'comments': None,
'cover': 'C:\\Users\\ruper\\AppData\\Local\\Temp\\calibre_7 r4bnwo6\\ubryop4v.jpeg',
'custom_size': None,
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'expand_css': False,
'extra_css': None,
'filter_css': '',
'fix_indents': True,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x07A76910>,
'insert_blank_line': False,
'insert_blank_line_size': 0.5,
'insert_metadata': False,
'isbn': None,
'italicize_common_cases': True,
'keep_ligatures': False,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 5.0,
'margin_left': 5.0,
'margin_right': 5.0,
'margin_top': 5.0,
'markup_chapter_headings': True,
'max_toc_links': 50,
'minimum_line_height': 120.0,
'no_chapters_in_toc': False,
'no_inline_navbars': False,
'output_profile': <calibre.customize.profiles.GenericEink object at 0x07A76A90>,
'page_breaks_before': "//*[name()='h1' or name()='h2']",
'paper_size': 'letter',
'pdf_add_toc': False,
'pdf_default_font_size': 20,
'pdf_footer_template': None,
'pdf_header_template': None,
'pdf_hyphenate': False,
'pdf_mark_links': False,
'pdf_mono_family': 'Courier',
'pdf_mono_font_size': 16,
'pdf_odd_even_offset': 0.0,
'pdf_page_margin_bottom': 72.0,
'pdf_page_margin_left': 72.0,
'pdf_page_margin_right': 72.0,
'pdf_page_margin_top': 72.0,
'pdf_page_number_map': None,
'pdf_page_numbers': False,
'pdf_sans_family': 'MS Shell Dlg 2',
'pdf_serif_family': 'MS Shell Dlg 2',
'pdf_standard_font': 'serif',
'pdf_use_document_margins': False,
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'C:\\Users\\ruper\\AppData\\Local\\Temp\\calibre_7 r4bnwo6\\klqj5jva.opf',
'remove_fake_margins': True,
'remove_first_image': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'renumber_headings': True,
'replace_scene_breaks': '',
'search_replace': '[]',
'series': None,
'series_index': None,
'smarten_punctuation': False,
'sr1_replace': None,
'sr1_search': None,
'sr2_replace': None,
'sr2_search': None,
'sr3_replace': None,
'sr3_search': None,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'transform_css_rules': '[]',
'uncompressed_pdf': False,
'unit': 'inch',
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'use_profile_size': False,
'verbose': 2}
DeDRM v7.2.1: Trying to decrypt 084kkzvz.mobi
MobiDeDrm v1.0.
Copyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.
Decrypting Mobipocket 4 ebook: Mathematics at the Meridian (Chapman & Hall/CRC Numerical Analysis and Scientific Computing Series)
Got DSN key from database D025A0A0242203QQ
Found 10 keys to try after 0.1 seconds
Crypto Type is: 0
This book is not encrypted.
Decryption succeeded after 0.1 seconds
DeDRM v7.2.1: Finished after 0.2 seconds
InputFormatPlugin: MOBI Input running
on C:\Users\ruper\AppData\Local\Temp\calibre_7r4bnwo6 \b11ya40v.mobi
Extracting text...
Adding anchors...
Extracting images...
Cleaning up HTML...
Parsing HTML...
Malformed markup, parsing using html5-parser
Converting style information to CSS...
Creating OPF...
Parsing all content...
Parsing styles.css ...
Parsing index.html ...

[kovidgoyal]

First, update calibre your version is very old. And azw4 is PDF in a wrapper already. Use the kindleunpack plugin to extract the pdf directly no need for conversion.

[rdsk]

Many thanks. I have now unpacked the pdf from the azw4 format.
The file is very large and I'd like to compress it. However, when I try the reduce file size in acrobat 10 pro, I get message that: "This PDF document has been digitally signed. The size of digitally signed files cannot be reduced."

I tried Google Bard, which suggested saving in PDFA/1a format but this actually increased the file size from 55MB to 56MB.
1. Is it possible to remove the digital signature eg via copying to another format or printing to a new pdf file?
2. Are there anyways to substantially reduce the file size please?

[Comfy.n]

Originally Posted by rdsk

2. Are there anyways to substantially reduce the file size please?

you can use this commercial software trial.

menu File -> Optimize PDF -> reduced size

[rdsk]

hi, so I downloaded the trial of nitro pdf pro as you suggest. How can I use it to reduce the file size of a digitally signed pdf?

The optimise option seems to be greyed out on the trial. So how can I test it?

If its not possible to do using the trial please tell me if there is another way

[Comfy.n]

Originally Posted by rdsk

hi, so I downloaded the trial of nitro pdf pro as you suggest. How cna I use it to reduce the file size of a digitlly signed pef?

File -> Optimize PDF -> reduced size

doesn't work?

in that case I would probably try to find a non-signed version

[Quoth]

Originally Posted by rdsk

a digitally signed pdf?

The optimise option seems to be greyed out on the trial. So how can I test it?

Open and save copy with Ghostview to make it unsigned, or print to PDF (may make it into big images)?

[sendero]

dear all, I have the same problem, see below
calibre, version 5.44.0 (win32, embedded-python: True)
Conversion error: Failed: Convert book 1 of 1 (Intro to Jazz Piano)

Spoiler:

Convert book 1 of 1 (Intro to Jazz Piano)
DeDRM v7.2.1: Trying to decrypt mmrmop82.azw4
Using Library AlfCrypto DLL/DYLIB/SO
Using Library AlfCrypto DLL/DYLIB/SO
MobiDeDrm v1.0.
Copyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.
Decrypting Mobipocket 4 ebook: Intro to Jazz Piano
Found 0 keys to try after 0.1 seconds
Crypto Type is: 2
DeDRM v7.2.1: Failed to decrypt with error: No key found in 0 PIDs tried.
DeDRM v7.2.1: Looking for new default Kindle Key after 0.1 seconds
searching for kinfoFiles in C:\Users\sende\AppData\Local
No K4PC kindle.info/kinf/kinf2011 files have been found.
DeDRM v7.2.1: Ultimately failed to decrypt after 0.1 seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/...master/FAQs.md
Conversion options changed from defaults:
output_profile: 'generic_eink'
verbose: 2
read_metadata_from_opf: 'C:\\Users\\sende\\AppData\\Local\\Temp\\calibre_g gcminsc\\gwdo1dg5.opf'
cover: 'C:\\Users\\sende\\AppData\\Local\\Temp\\calibre_g gcminsc\\_ly1xkdu.jpeg'
Resolved conversion options
calibre version: 5.44.0
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': 'original',
'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
"'\\s*((chapter|book|section|part)\\s+)|((prolog|p rologue|epilogue)(\\s+|$))', "
"'i')) or @class = 'chapter']",
'chapter_mark': 'pagebreak',
'comments': None,
'cover': 'C:\\Users\\sende\\AppData\\Local\\Temp\\calibre_g gcminsc\\_ly1xkdu.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_split_on_page_breaks': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'epub_flatten': False,
'epub_inline_toc': False,
'epub_toc_at_end': False,
'epub_version': '2',
'expand_css': False,
'extra_css': None,
'extract_to': None,
'filter_css': '',
'fix_indents': True,
'flow_size': 260,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x00000247FFBDB910>,
'insert_blank_line': False,
'insert_blank_line_size': 0.5,
'insert_metadata': False,
'isbn': None,
'italicize_common_cases': True,
'keep_ligatures': False,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 5.0,
'margin_left': 5.0,
'margin_right': 5.0,
'margin_top': 5.0,
'markup_chapter_headings': True,
'max_toc_links': 50,
'minimum_line_height': 120.0,
'no_chapters_in_toc': False,
'no_default_epub_cover': False,
'no_inline_navbars': False,
'no_svg_cover': False,
'output_profile': <calibre.customize.profiles.GenericEink object at 0x00000247FFBDBC40>,
'page_breaks_before': "//*[name()='h1' or name()='h2']",
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': True,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'C:\\Users\\sende\\AppData\\Local\\Temp\\calibre_g gcminsc\\gwdo1dg5.opf',
'remove_fake_margins': True,
'remove_first_image': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'renumber_headings': True,
'replace_scene_breaks': '',
'search_replace': '[]',
'series': None,
'series_index': None,
'smarten_punctuation': False,
'sr1_replace': None,
'sr1_search': None,
'sr2_replace': None,
'sr2_search': None,
'sr3_replace': None,
'sr3_search': None,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'transform_css_rules': '[]',
'transform_html_rules': '[]',
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
Running file type plugin DeDRM failed with traceback:
Traceback (most recent call last):
File "calibre_plugins.dedrm.__init__", line 540, in KindleMobiDecrypt
File "calibre_plugins.dedrm.k4mobidedrm", line 238, in GetDecryptedBook
File "calibre_plugins.dedrm.mobidedrm", line 484, in processBook
calibre_plugins.dedrm.mobidedrm.DrmException: No key found in 0 PIDs tried.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "calibre\customize\ui.py", line 175, in _run_filetype_plugins
File "calibre_plugins.dedrm.__init__", line 633, in run
File "calibre_plugins.dedrm.__init__", line 583, in KindleMobiDecrypt
calibre_plugins.dedrm.DeDRMError: DeDRM v7.2.1: Ultimately failed to decrypt after 0.1 seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/...master/FAQs.md
DeDRM v7.2.1: Trying to decrypt mmrmop82.azw4
MobiDeDrm v1.0.
Copyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.
Decrypting Mobipocket 4 ebook: Intro to Jazz Piano
Found 0 keys to try after 0.0 seconds
Crypto Type is: 2
DeDRM v7.2.1: Failed to decrypt with error: No key found in 0 PIDs tried.
DeDRM v7.2.1: Looking for new default Kindle Key after 0.0 seconds
searching for kinfoFiles in C:\Users\sende\AppData\Local
No K4PC kindle.info/kinf/kinf2011 files have been found.
DeDRM v7.2.1: Ultimately failed to decrypt after 0.0 seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/...master/FAQs.md
Running file type plugin DeDRM failed with traceback:
Traceback (most recent call last):
File "calibre_plugins.dedrm.__init__", line 540, in KindleMobiDecrypt
File "calibre_plugins.dedrm.k4mobidedrm", line 238, in GetDecryptedBook
File "calibre_plugins.dedrm.mobidedrm", line 484, in processBook
calibre_plugins.dedrm.mobidedrm.DrmException: No key found in 0 PIDs tried.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "calibre\customize\ui.py", line 175, in _run_filetype_plugins
File "calibre_plugins.dedrm.__init__", line 633, in run
File "calibre_plugins.dedrm.__init__", line 583, in KindleMobiDecrypt
calibre_plugins.dedrm.DeDRMError: DeDRM v7.2.1: Ultimately failed to decrypt after 0.0 seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/...master/FAQs.md
InputFormatPlugin: AZW4 Input running
on C:\Users\sende\AppData\Local\Temp\calibre_ggcminsc \mmrmop82.azw4
Extracting PDF from AZW4 Container...
Converting file to html...
Traceback (most recent call last):
File "runpy.py", line 194, in _run_module_as_main
File "runpy.py", line 87, in _run_code
File "site.py", line 82, in <module>
File "site.py", line 77, in main
File "site.py", line 49, in run_entry_point
File "calibre\utils\ipc\worker.py", line 215, in main
File "calibre\gui2\convert\gui_conversion.py", line 38, in gui_convert_override
File "calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "calibre\ebooks\conversion\plumber.py", line 1108, in run
File "calibre\customize\conversion.py", line 242, in __call__
File "calibre\ebooks\conversion\plugins\azw4_input. py", line 25, in convert
File "calibre\ebooks\azw4\reader.py", line 55, in extract_content
File "calibre\ebooks\conversion\plugins\pdf_input.p y", line 51, in convert
File "calibre\ebooks\pdf\pdftohtml.py", line 82, in pdftohtml
calibre.ebooks.ConversionError: pdftohtml failed with return code: 1
Syntax Error: Document stream is empty