MP3 defined in opf as media-type="text/plain

LGN · 04-26-2013, 12:23 PM

I was just experimenting with adding an mp3 to an epub with sigil and used my script to convert ePUB2 to ePUB3. Then I ran the resulting ePUB through epubcheck 3.0 and I got:

Epubcheck Version 3.0
Validating against EPUB version 3.0
"Audio element doesn't provide fallback"

That was the only error. When I examined the content.opf I noticed the mp3 is defined as text/plain in the opf. whereas I expected: audio/mpeg.

While I can (and probably will) adapt by script to correct for this issue I just wonder why Sigil supports adding media yet it puts the media as text/plain.

Is setting audio as text/plain an oversight or has it be done on purpose?

teh603 · 04-26-2013, 12:50 PM

Why are you including an audio track in a book in the first place?

theducks · 04-26-2013, 01:03 PM

Sigil will no longer TRASH non EPUB2 files, it just leaves them alone.

EPUB2 does not support Audio

It is up to you to make the EPUB3 hacks to the OPF

LGN · 04-26-2013, 02:04 PM

Sigil has the option to insert a file and it has Audio and Video folders and when adding an MP3 it adds the code for it, '<audio controls="controls" src="../Audio/test.mp3"></audio>' and adds the file into the OPF. It even shows Audio and Video folders when you start Sigil thus suggesting it has some support for them.

At least if it adds MP3 have it add correct application type. No worries though, I can have my ePUB2 to ePUB3 converter 'fix' the issue automatically on conversion. I end up with a fully compatible and validatable ePUB3.

As for why one wants to add audio or video to an ePUB in the first place is something that might be useful is some cases. An instruction video in an ePUB is one of the examples.

I know Sigil is ePUB2 only, I know ePUB2 doesn't support audio

That is why I made my convertor to convert the ePUB2 to a valid ePUB3.

DiapDealer · 04-26-2013, 02:23 PM

Quote:

Originally Posted by LGN

It even shows Audio and Video folders when you start Sigil thus suggesting it has some support for them.

Sigil's current level of "support" for audio/video in ePubs is pretty much what The Ducks described: Sigil won't silently get rid of audio/video in existing epub 2 packages (to make it compliant) like it used to do. But it's not going to do much of anything in the way of assisting you in creating brand-spanking-new (and functional) multi-media epubs. It's very much at that "let's not completely F-up an archive with multimedia files in them ... let's just slam those files in these handily named folders; manifest them and forget about them for now" stage.

mrmikel · 04-26-2013, 03:38 PM

Sigil is likely to stay in this state until there are actually devices that can use epub3s and there are enough of them to figure out what is actually supported by them.

04-26-2013, 12:23 PM	#1
LGN Connoisseur Posts: 88 Karma: 60 Join Date: Oct 2010 Device: ProMedia eReader, Sony PRS-600	MP3 defined in opf as media-type="text/plain I was just experimenting with adding an mp3 to an epub with sigil and used my script to convert ePUB2 to ePUB3. Then I ran the resulting ePUB through epubcheck 3.0 and I got: Epubcheck Version 3.0 Validating against EPUB version 3.0 "Audio element doesn't provide fallback" That was the only error. When I examined the content.opf I noticed the mp3 is defined as text/plain in the opf. whereas I expected: audio/mpeg. While I can (and probably will) adapt by script to correct for this issue I just wonder why Sigil supports adding media yet it puts the media as text/plain. Is setting audio as text/plain an oversight or has it be done on purpose?

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04-26-2013, 12:50 PM	#2
teh603 Autism Spectrum Disorder Posts: 1,212 Karma: 6244877 Join Date: Sep 2011 Location: Coastal Texas Device: Android Phone	Why are you including an audio track in a book in the first place?

04-26-2013, 01:03 PM	#3
theducks Well trained by Cats Posts: 29,800 Karma: 54830978 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Sigil will no longer TRASH non EPUB2 files, it just leaves them alone. EPUB2 does not support Audio It is up to you to make the EPUB3 hacks to the OPF

04-26-2013, 02:04 PM	#4
LGN Connoisseur Posts: 88 Karma: 60 Join Date: Oct 2010 Device: ProMedia eReader, Sony PRS-600	Sigil has the option to insert a file and it has Audio and Video folders and when adding an MP3 it adds the code for it, '<audio controls="controls" src="../Audio/test.mp3"></audio>' and adds the file into the OPF. It even shows Audio and Video folders when you start Sigil thus suggesting it has some support for them. At least if it adds MP3 have it add correct application type. No worries though, I can have my ePUB2 to ePUB3 converter 'fix' the issue automatically on conversion. I end up with a fully compatible and validatable ePUB3. As for why one wants to add audio or video to an ePUB in the first place is something that might be useful is some cases. An instruction video in an ePUB is one of the examples. I know Sigil is ePUB2 only, I know ePUB2 doesn't support audio That is why I made my convertor to convert the ePUB2 to a valid ePUB3.

04-26-2013, 03:38 PM	#6
mrmikel Color me gone Posts: 2,089 Karma: 1445295 Join Date: Apr 2008 Location: Central Oregon Coast Device: PRS-300	Sigil is likely to stay in this state until there are actually devices that can use epub3s and there are enough of them to figure out what is actually supported by them.

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