Editor is saving corrupted/invalid files

RobertWK · 09-13-2022, 04:13 PM

Hi! I'm outputting a how-to book that has a bunch of images (over 200), and I've been using calibre to work on the epub version.

I've noticed that at some point (not sure when) calibre has started outputting invalid/damaged/corrupt epub files. This is verified whenever I go to load up my epub on a device with some ereader software.

Sometimes I can load the file up in sigil and fix it, but I'm not sure what fixes are being auto-applied.

Sometimes the calibre files that are outputted are fine. I'm very confused and frustrated by what's going on.

Is there anyone else that has experienced this or knows where I might start to troubleshoot?

KevinH · 09-13-2022, 05:16 PM

Just in case ...

If you want to see the fixes that Sigil makes, turn off mend on open in Sigil prefs. Open your problem epub. Do not respond to any prompts to autofix. Hit the Checkpoint icon to make a Checkpoint of it. Exit out of Sigil. Re-enable mend on open, reopen the problem epub, allow Sigil to autofix things. The use Sigil's checkpoint diff tool to see all changes since the checkpoint.

That said, calibre is really robust and and can handle a lot of bad markup, so I doubt anything that Sigil auto fixes would be a challenge for calibre at all.

You might want to try running epubcheck instead or calibre's auto mend. Or even a calibre epub to epub conversion.

jhowell · 09-13-2022, 05:18 PM

Are you running a 32-bit version of calibre?

If so it may be running out of memory and switching to a 64-bit version would prevent that.

RobertWK · 09-13-2022, 09:07 PM

Quote:

Originally Posted by KevinH

Just in case ...

If you want to see the fixes that Sigil makes, turn off mend on open in Sigil prefs. Open your problem epub. Do not respond to any prompts to autofix. Hit the Checkpoint icon to make a Checkpoint of it. Exit out of Sigil. Re-enable mend on open, reopen the problem epub, allow Sigil to autofix things. The use Sigil's checkpoint diff tool to see all changes since the checkpoint.

That said, calibre is really robust and and can handle a lot of bad markup, so I doubt anything that Sigil auto fixes would be a challenge for calibre at all.

You might want to try running epubcheck instead or calibre's auto mend. Or even a calibre epub to epub conversion.

Thanks KevinH, I'll try those things the next time I check my file. I'm getting pretty close to the end so that'll be something I definitely explore before my epub gets to the publishing point.

RobertWK · 09-13-2022, 09:09 PM

Quote:

Originally Posted by jhowell

Are you running a 32-bit version of calibre?

If so it may be running out of memory and switching to a 64-bit version would prevent that.

Definitely not. I only installed the 64 bit version.

kovidgoyal · 09-13-2022, 09:33 PM

I highly doubt the editor is saving corrupted files. As for invalid ones, the editor does not prevent you from makig invalid epubs, that's up to you. Use the Check Book tool to check your epub.

RobertWK · 09-13-2022, 10:00 PM

Quote:

Originally Posted by kovidgoyal

I highly doubt the editor is saving corrupted files. As for invalid ones, the editor does not prevent you from makig invalid epubs, that's up to you. Use the Check Book tool to check your epub.

I actually thought to do that first, and the check tool is totally passing with no errors.

kovidgoyal · 09-14-2022, 02:16 AM

Then why do you say it is corrupted orinvalid?

BetterRed · 09-14-2022, 02:29 AM

Quote:

Originally Posted by RobertWK

Hi! I'm outputting a how-to book that has a bunch of images (over 200), and I've been using calibre to work on the epub version.

I've noticed that at some point (not sure when) calibre has started outputting invalid/damaged/corrupt epub files. This is verified whenever I go to load up my epub on a device with some ereader software.

Which device, what ereader software?

Are there some device/ereader combinations that 'work' and others that 'fail'?

BR

09-13-2022, 04:13 PM	#1
RobertWK Junior Member Posts: 7 Karma: 10 Join Date: Sep 2022 Device: none	Editor is saving corrupted/invalid files Hi! I'm outputting a how-to book that has a bunch of images (over 200), and I've been using calibre to work on the epub version. I've noticed that at some point (not sure when) calibre has started outputting invalid/damaged/corrupt epub files. This is verified whenever I go to load up my epub on a device with some ereader software. Sometimes I can load the file up in sigil and fix it, but I'm not sure what fixes are being auto-applied. Sometimes the calibre files that are outputted are fine. I'm very confused and frustrated by what's going on. Is there anyone else that has experienced this or knows where I might start to troubleshoot?

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09-13-2022, 05:16 PM	#2
KevinH Sigil Developer Posts: 8,764 Karma: 6000000 Join Date: Nov 2009 Device: many	Just in case ... If you want to see the fixes that Sigil makes, turn off mend on open in Sigil prefs. Open your problem epub. Do not respond to any prompts to autofix. Hit the Checkpoint icon to make a Checkpoint of it. Exit out of Sigil. Re-enable mend on open, reopen the problem epub, allow Sigil to autofix things. The use Sigil's checkpoint diff tool to see all changes since the checkpoint. That said, calibre is really robust and and can handle a lot of bad markup, so I doubt anything that Sigil auto fixes would be a challenge for calibre at all. You might want to try running epubcheck instead or calibre's auto mend. Or even a calibre epub to epub conversion.

09-13-2022, 05:18 PM	#3
jhowell Grand Sorcerer Posts: 7,072 Karma: 91577715 Join Date: Nov 2011 Location: Charlottesville, VA Device: Kindles	Are you running a 32-bit version of calibre? If so it may be running out of memory and switching to a 64-bit version would prevent that.

09-13-2022, 09:33 PM	#6
kovidgoyal creator of calibre Posts: 45,355 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	I highly doubt the editor is saving corrupted files. As for invalid ones, the editor does not prevent you from makig invalid epubs, that's up to you. Use the Check Book tool to check your epub.

09-14-2022, 02:16 AM	#8
kovidgoyal creator of calibre Posts: 45,355 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Then why do you say it is corrupted orinvalid?