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Old 11-28-2020, 09:20 AM   #1
JSWolf
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Video with KOReader and Kobo
There's a thread in the ePub forum about video in an ePub 3,

https://www.mobileread.com/forums/sh...d.php?t=335054

Will KOReader on a Kobo play a video in an ePub 3 eBook?
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Old 11-28-2020, 09:48 AM   #2
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Will KOReader on a Kobo play a video in an ePub 3 eBook?
Nope. Never will. You need a web browser for that or any other of the "fancy" epub3 features like vertical text, javascript or ... ehm ... almost everything.
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Old 11-28-2020, 09:52 AM   #3
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Also, playing not-made-for-eInk videos on eInk halfway decently would require an EPDCv2 device (e.g., Mk. 7 on Kobo), so, even a DIY approach would really not be worth the effort, for what I consider a gimmick. (Like, err, much of the ePub spec? ).
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Old 11-28-2020, 11:51 AM   #4
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@NiLuJe What, you haven't done an ffmpeg-eink fork yet or something? :P

Setting aside display, doubtless the most difficult part, I think most readers are a bit lacking in the sound department.
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Old 11-28-2020, 12:27 PM   #5
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@Frenzie:

;P. Nah, I just tested how fast you could actually get it to refresh while also pushing the CPU with the Doom demo .

I think there's an rM experiment with... gstreamer or something, though. But with pre-dithered content, much like @geekmaster's demo back in the Vizplex days on Kindle .

An EPDCv2 allows you to bypass that requirement, thanks to the fast bitonal ordered dither handled by the PxP. (Well, an EPDCv2 where that's not broken, actually... Looking at you, Kindle Zelda/Rex ).
Last edited by NiLuJe; 11-28-2020 at 12:29 PM.
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Old 11-28-2020, 01:54 PM   #6
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@Frenzie:

;P. Nah, I just tested how fast you could actually get it to refresh while also pushing the CPU with the Doom demo .
A epub3 compliant engine should be able to run Doom too.

Intended as a joke, but now see that it was proposed: https://www.w3.org/2020/06/proposed-epub-3-charter.html
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Old 11-28-2020, 02:00 PM   #7
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*sigh* .
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Old 11-28-2020, 02:56 PM   #8
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Since video is out, what other ePub 3 specific features does KOReader support or not?
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Old 11-28-2020, 03:55 PM   #9
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I think non-linear fragments are EPUB3-only?
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Old 11-29-2020, 03:13 AM   #10
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No, they're ePub2.
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Old 11-29-2020, 04:59 AM   #11
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I think non-linear fragments are EPUB3-only?
No, they're ePub2.
They're valid in epub2 and epub3 books, but according to the epub2 specs, rendering engines may ignore them:

Quote:
Originally Posted by IDPF
For each itemref, the publication author may specify the optional linear attribute to designate whether the associated OPS Content Document is primary (linear="yes", which is the default when linear is not present) or auxiliary (linear="no".) [...]

Reading Systems are not required to differentiate between primary and auxiliary content, and for the requirements and recommendations given in this section may consider all OPS Content Documents in spine to be primary, regardless of the value of the linear attribute.
(Emphasis mine.)
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Old 11-29-2020, 05:59 AM   #12
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They're valid in epub2 and epub3 books, but according to the epub2 specs, rendering engines may ignore them:
ADE ignores them. So using them is not a good idea since the most used software ignores them.
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