Viewer fails on some ePub files

Arisia · Yesterday, 01:27 PM

Ubuntu 22.04 with latest updates and patches
Calibre 8.9.0

Some (not all) ePub files in my library are producing the following errors when opened with E-Book Viewer:

Failed to open book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show Details" for more info.

Show details yields:

calibre, version 8.9.0
ERROR: Loading book failed: Failed to open the book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show details" for more info.

Failed to convert book: /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub with error:
DeDRM v10.0.9: Trying to decrypt Fantasy - the Best of 2001 - Robert Silverberg.epub
DeDRM v10.0.9: Verifying zip archive integrity
DeDRM v10.0.9: Post-processing took 0.0 seconds
DeDRM v10.0.9: Finished after 0.4 seconds
InputFormatPlugin: EPUB Input running
on /tmp/calibre-l8elmsrk/a0ivjmem.epub
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
File "runpy.py", line 198, in _run_module_as_main
File "runpy.py", line 88, in _run_code
File "site.py", line 47, in <module>
File "site.py", line 43, in main
File "calibre/utils/ipc/worker.py", line 194, in main
File "<string>", line 1, in <module>
File "calibre/srv/render_book.py", line 847, in viewer_main
File "calibre/srv/render_book.py", line 838, in render_for_viewer
File "calibre/srv/render_book.py", line 816, in render
File "calibre/srv/render_book.py", line 618, in process_exploded_book
calibre.srv.render_book.Spineless: Book is empty, no content in spine

The book mentioned above opens in Moon Reader Pro on an android device without problem or complaint. I can also edit the book in Calibre and see the underlying image and HTML files, and view them there without problems.

This same general error happens for multiple (at least 20 of the 30 that I tried) ePub files in my library. These files have been in my library for a long time (since at least version 6.x). Ideas on what might be causing this? If a copy of the ePub is needed to check, I can supply one (but obviously I didn't want to post it here).

JSWolf · Yesterday, 04:29 PM

Quote:

Originally Posted by Arisia

Ubuntu 22.04 with latest updates and patches
Calibre 8.9.0

Some (not all) ePub files in my library are producing the following errors when opened with E-Book Viewer:

Failed to open book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show Details" for more info.

Show details yields:

calibre, version 8.9.0
ERROR: Loading book failed: Failed to open the book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show details" for more info.

Failed to convert book: /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub with error:
DeDRM v10.0.9: Trying to decrypt Fantasy - the Best of 2001 - Robert Silverberg.epub
DeDRM v10.0.9: Verifying zip archive integrity
DeDRM v10.0.9: Post-processing took 0.0 seconds
DeDRM v10.0.9: Finished after 0.4 seconds
InputFormatPlugin: EPUB Input running
on /tmp/calibre-l8elmsrk/a0ivjmem.epub
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
File "runpy.py", line 198, in _run_module_as_main
File "runpy.py", line 88, in _run_code
File "site.py", line 47, in <module>
File "site.py", line 43, in main
File "calibre/utils/ipc/worker.py", line 194, in main
File "<string>", line 1, in <module>
File "calibre/srv/render_book.py", line 847, in viewer_main
File "calibre/srv/render_book.py", line 838, in render_for_viewer
File "calibre/srv/render_book.py", line 816, in render
File "calibre/srv/render_book.py", line 618, in process_exploded_book
calibre.srv.render_book.Spineless: Book is empty, no content in spine

The book mentioned above opens in Moon Reader Pro on an android device without problem or complaint. I can also edit the book in Calibre and see the underlying image and HTML files, and view them there without problems.

This same general error happens for multiple (at least 20 of the 30 that I tried) ePub files in my library. These files have been in my library for a long time (since at least version 6.x). Ideas on what might be causing this? If a copy of the ePub is needed to check, I can supply one (but obviously I didn't want to post it here).

Install the epubcheck plugin (for the editor) and use that and the built-in error checker to check what's wrong with your eBooks.

Arisia · Yesterday, 06:02 PM

Quote:

Originally Posted by JSWolf

Install the epubcheck plugin (for the editor) and use that and the built-in error checker to check what's wrong with your eBooks.

So I installed the plugin (thanks for the pointer

), but it doesn't really seem to tell me much about the ePub referenced in my first message. Here's all the output it gives me:

ERROR: Parsing failed: Opening and ending tag mismatch: head line 1 and HEAD, line 1, column 275****[OEBPS/ title-page.htm:1]

and here is the portion it appears to be complaining about:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><link rel="stylesheet" type="application/vnd.adobe-page-template+xml" href="page-template.xpgt"/></HEAD><BODY><div align="center">

Now, I can see that the case of the tags (head vs /HEAD) is different, but I believe that HTML is case insensitive (I could be wrong - it has been years since I actually wrote any HTML), so this should be a non-issue. Also, the preview window correctly shows the title page...

Any other ideas or suggestions?

JSWolf · Yesterday, 07:58 PM

Post the title-page.htm so I or someone else can have a look at it,

slm · Yesterday, 08:54 PM

Quote:

Originally Posted by Arisia

Now, I can see that the case of the tags (head vs /HEAD) is different, but I believe that HTML is case insensitive (I could be wrong - it has been years since I actually wrote any HTML), so this should be a non-issue. Also, the preview window correctly shows the title page...

Any other ideas or suggestions?

HTML is not case sensitive but XTML is. I'm not sure that the epub standard treats these files as HTML.

PeterT · Yesterday, 09:37 PM

Why not use the ScrambleEbook plugin and upload the scrambled book...

Arisia · Yesterday, 09:43 PM

Quote:

Originally Posted by JSWolf

Post the title-page.htm so I or someone else can have a look at it,

Here's the title-page.htm, as shown in the Edit Book screen.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><link rel="stylesheet" type="application/vnd.adobe-page-template+xml" href="page-template.xpgt"/></HEAD><BODY><div align="center">
<font size="5"><b>Fantasy The Best of 2001</b></font><br />
<br />
<font size="3">ROBERT SILVERBERG AND KAREN HABER<br />
<br />
</font><br />
<img src="logo.jpg" size="100%" />
<br />
<font size="2">ibooks<br />
new york<br />
<a href="http://www.ibooksinc.com">www.ibooksinc.com</a></font></div>
</BODY></HTML>

So, like I said, I'm not sure the head vs /HEAD is the root of the problem. I will look at a few others that don't open in the E-Book Viewer and see if they have the same issue. If not, I'm thinking that there may be some deeper issue going on here....

theducks · Yesterday, 10:14 PM

Mine looks quite different except for the body content. (Mine is also beautified for easy reading)

Code:

<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>Unknown</title>
</head>

<body>

  <div align="center">

    <font size="5"><b>Science Fiction The Best of 2001</b></font>

    <br/>

    <br/>

    <font size="3">Robert Silverberg and Karen Haber<br/> <br/> </font>

    <br/>

    <img src="logo.jpg" size="100%"/>

    <br/>

    <font size="2">ibooks<br/> new york<br/> <a href="http://www.ibooksinc.com">www.ibooksinc.com</a></font>

  </div>

</body>

</html>

It is almost like someone did an edit and removed/added stuff

kovidgoyal · Yesterday, 10:46 PM

Do an epub to epub conversion, that will fix them.

DNSB · Today, 01:46 AM

Just for the heck of it, I stuffed your posted code into Sigil and did a mend and prettify on it.

Spoiler:

One nasty item is that your code seems to use random case (<head> and </HEAD> for example).

I also stuffed your code into calibre's editor and ran it's internal bugchecker (the ladybug icon). I've attached those results as an image.

Basically, Garbage in, Garbage out.

JSWolf · Today, 07:20 AM

Quote:

Originally Posted by Arisia

Here's the title-page.htm, as shown in the Edit Book screen.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><link rel="stylesheet" type="application/vnd.adobe-page-template+xml" href="page-template.xpgt"/></HEAD><BODY><div align="center">
<font size="5"><b>Fantasy The Best of 2001</b></font><br />
<br />
<font size="3">ROBERT SILVERBERG AND KAREN HABER<br />
<br />
</font><br />
<img src="logo.jpg" size="100%" />
<br />
<font size="2">ibooks<br />
new york<br />
<a href="http://www.ibooksinc.com">www.ibooksinc.com</a></font></div>
</BODY></HTML>

So, like I said, I'm not sure the head vs /HEAD is the root of the problem. I will look at a few others that don't open in the E-Book Viewer and see if they have the same issue. If not, I'm thinking that there may be some deeper issue going on here....

The entire HTML needs to be scrapped and rewritten correctly. It's very much a mess that generates a lot of errors with epubcheck.

Here is your title page after an ePub to ePub conversion.

Code:

<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>The Eagle has Landed</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <link rel="stylesheet" type="text/css" href="../stylesheet.css"/>
</head>
  <body class="calibre">
<p class="tit"><b class="calibre1">The Eagle Has Landed</b></p>
<p class="stit">The Liam Devlin Novels</p>
<p class="tit1">Jack Higgins</p>
<p class="ser"><img alt="img" src="images/logo.jpg" class="calibre2"/></p>
</body>
</html>

Yesterday, 01:27 PM	#1
Arisia Junior Member Posts: 6 Karma: 10 Join Date: Nov 2024 Device: Moon+ on Android	Viewer fails on some ePub files Ubuntu 22.04 with latest updates and patches Calibre 8.9.0 Some (not all) ePub files in my library are producing the following errors when opened with E-Book Viewer: Failed to open book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show Details" for more info. Show details yields: calibre, version 8.9.0 ERROR: Loading book failed: Failed to open the book at /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub. Click "Show details" for more info. Failed to convert book: /media/<elided>/eBooks/eBooks/Robert Silverberg/Fantasy - the Best of 2001 (9777)/Fantasy - the Best of 2001 - Robert Silverberg.epub with error: DeDRM v10.0.9: Trying to decrypt Fantasy - the Best of 2001 - Robert Silverberg.epub DeDRM v10.0.9: Verifying zip archive integrity DeDRM v10.0.9: Post-processing took 0.0 seconds DeDRM v10.0.9: Finished after 0.4 seconds InputFormatPlugin: EPUB Input running on /tmp/calibre-l8elmsrk/a0ivjmem.epub Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main() Traceback (most recent call last): File "runpy.py", line 198, in _run_module_as_main File "runpy.py", line 88, in _run_code File "site.py", line 47, in <module> File "site.py", line 43, in main File "calibre/utils/ipc/worker.py", line 194, in main File "<string>", line 1, in <module> File "calibre/srv/render_book.py", line 847, in viewer_main File "calibre/srv/render_book.py", line 838, in render_for_viewer File "calibre/srv/render_book.py", line 816, in render File "calibre/srv/render_book.py", line 618, in process_exploded_book calibre.srv.render_book.Spineless: Book is empty, no content in spine The book mentioned above opens in Moon Reader Pro on an android device without problem or complaint. I can also edit the book in Calibre and see the underlying image and HTML files, and view them there without problems. This same general error happens for multiple (at least 20 of the 30 that I tried) ePub files in my library. These files have been in my library for a long time (since at least version 6.x). Ideas on what might be causing this? If a copy of the ePub is needed to check, I can supply one (but obviously I didn't want to post it here).

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Yesterday, 07:58 PM	#4
JSWolf Resident Curmudgeon Posts: 80,030 Karma: 147977995 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Post the title-page.htm so I or someone else can have a look at it,

Yesterday, 09:37 PM	#6
PeterT Grand Sorcerer Posts: 13,577 Karma: 79436804 Join Date: Nov 2007 Location: Toronto Device: Libra H2O, Libra Colour	Why not use the ScrambleEbook plugin and upload the scrambled book...

Yesterday, 10:46 PM	#9
kovidgoyal creator of calibre Posts: 45,447 Karma: 27757438 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Do an epub to epub conversion, that will fix them.