Clara HD header line for kepubs- frustration

stumped · 08-02-2023, 01:03 PM

my reader settings are show pages left in chapter in header, pages left in book in footer
Kobo gets the numbers right, usually, but it is prone to latching onto one title tag ( like title page) and putting that into every chapter header, even when the chapter files each have Chapter name & number in their own title tags

if i directly select e.g. chapter 1 from the toc. the header will correctly say chapter 1, but go forward or back a chapter using the navigation arrows , and it reverts to title page in the header ( which it got from the title page foof the actual title page

in other books I have seen it render every chapter with a title of " part 1 " , or "cover", or "glossary"

I simply cant suss out the logic that the kobo software is using.
even when I carefully check all the known conditions it favours - such as 1 file per chapter, 1 header per file.. and a correct title tag set in each file, it still seems to go wrong

can anyone explain why please.

my kepubs are all generated from epub when sent via calibre using the correct driver plugin.
i can inspect aa copy of hte sent kepub and it will look to be correctly coded
e.g. 15th chapter file will start with
<head>
<title>Chapter 15</title>
but will still show in header on device , within said chapter , as title page 1 of xx

even more puzzling - with some books, it all just works, but I can't spot any difference in code between those books and the ones where it does not work so well

with the epub renderer the problem goes way , obviously, because there is no such header, but Id really like to understand the kepub issue - because every time it bugs me I want to go edit the epub and resend it to fix the issue.

but have inspected toc.ncx and content.opf files before sending - all looks correct in those.

so I am stuck

& cant find any relevant kobo documentation

is it a known kobo bug whereby it takes the content of the first title tag encountered in the book - or sometimes the last one in the book, and then always uses it instead of any actual title tag in the chapter

my kobo software version 4.35.204000 but AFAIK its always been this way in all firmware versions

stumped · 08-03-2023, 05:35 AM

update- this is my most mystifying example.
I have a book where each chapter has identical structure code- same stuff in head section, a single header then text in the body section.

but when I start into it, on Kobo, skipping through one chapter at a time, the first 7 chapters are all called " title page" in kepub header , then from chapter 8 onwards the kepub page headers are correct - they show chapter 8... etc title tag in header.
I've tried gong backwards from chapter 15 and there is still that change at ch8

i see
title page page 1 of nn
at top of chapters 1 through 7
then
chapter 8 page 1 of nn
at top of chapter 8

note that all the nn are the correct chapter page counts. i read and watch the count and each chapter ends where the count predicts.

jackie_w · 08-03-2023, 07:42 AM

It could be a TOC problem. A couple of possibilities spring to mind.

If you're a calibre user, have you tried the Kobo Utilities plugin and its 'Update TOC for selected books' option? Kobo extracts the TOC when it first imports a book into its database. If you later replace the book file with one that has a different TOC then Bad Things can happen. The KU TOC option allows you to get the book's database TOC and the its internal TOC re-synchronised.
In the problematic book is there a one-to-one relationship between the HTML files in the book and the entries in the TOC? i.e. no HTML files missing from the TOC and no HTML file which has multiple TOC entries.

08-02-2023, 01:03 PM	#1
stumped Wizard Posts: 3,305 Karma: 10259306 Join Date: May 2016 Device: kobo forma, Kobo Libra, Huawei media Tab, fire HD10, PW3 HDX8.9,	header line for kepubs- frustration my reader settings are show pages left in chapter in header, pages left in book in footer Kobo gets the numbers right, usually, but it is prone to latching onto one title tag ( like title page) and putting that into every chapter header, even when the chapter files each have Chapter name & number in their own title tags if i directly select e.g. chapter 1 from the toc. the header will correctly say chapter 1, but go forward or back a chapter using the navigation arrows , and it reverts to title page in the header ( which it got from the title page foof the actual title page in other books I have seen it render every chapter with a title of " part 1 " , or "cover", or "glossary" I simply cant suss out the logic that the kobo software is using. even when I carefully check all the known conditions it favours - such as 1 file per chapter, 1 header per file.. and a correct title tag set in each file, it still seems to go wrong can anyone explain why please. my kepubs are all generated from epub when sent via calibre using the correct driver plugin. i can inspect aa copy of hte sent kepub and it will look to be correctly coded e.g. 15th chapter file will start with <head> <title>Chapter 15</title> but will still show in header on device , within said chapter , as title page 1 of xx even more puzzling - with some books, it all just works, but I can't spot any difference in code between those books and the ones where it does not work so well with the epub renderer the problem goes way , obviously, because there is no such header, but Id really like to understand the kepub issue - because every time it bugs me I want to go edit the epub and resend it to fix the issue. but have inspected toc.ncx and content.opf files before sending - all looks correct in those. so I am stuck & cant find any relevant kobo documentation is it a known kobo bug whereby it takes the content of the first title tag encountered in the book - or sometimes the last one in the book, and then always uses it instead of any actual title tag in the chapter my kobo software version 4.35.204000 but AFAIK its always been this way in all firmware versions Last edited by stumped; 08-02-2023 at 01:10 PM.

08-03-2023, 07:42 AM	#3
jackie_w Grand Sorcerer Posts: 6,251 Karma: 16539642 Join Date: Sep 2009 Location: UK Device: ClaraHD, Forma, Libra2, Clara2E, LibraCol, PBTouchHD3	It could be a TOC problem. A couple of possibilities spring to mind. If you're a calibre user, have you tried the Kobo Utilities plugin and its 'Update TOC for selected books' option? Kobo extracts the TOC when it first imports a book into its database. If you later replace the book file with one that has a different TOC then Bad Things can happen. The KU TOC option allows you to get the book's database TOC and the its internal TOC re-synchronised. In the problematic book is there a one-to-one relationship between the HTML files in the book and the entries in the TOC? i.e. no HTML files missing from the TOC and no HTML file which has multiple TOC entries.

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08-03-2023, 05:35 AM	#2
stumped Wizard Posts: 3,305 Karma: 10259306 Join Date: May 2016 Device: kobo forma, Kobo Libra, Huawei media Tab, fire HD10, PW3 HDX8.9,	update- this is my most mystifying example. I have a book where each chapter has identical structure code- same stuff in head section, a single header then text in the body section. but when I start into it, on Kobo, skipping through one chapter at a time, the first 7 chapters are all called " title page" in kepub header , then from chapter 8 onwards the kepub page headers are correct - they show chapter 8... etc title tag in header. I've tried gong backwards from chapter 15 and there is still that change at ch8 i see title page page 1 of nn at top of chapters 1 through 7 then chapter 8 page 1 of nn at top of chapter 8 note that all the nn are the correct chapter page counts. i read and watch the count and each chapter ends where the count predicts.

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