According to this article EPUB3 audio overlays should be supported in the latest Calibre:
https://www.omgubuntu.co.uk/2023/12/...dio-epub-notes
I cannot find it confirmed so clearly on Calibre's website though. Is it supported?
I could not get it to work yet, but everything suggests that it should work. The only thing not working is the audio coming through.
I have tried it with this Audio-ebook here:
https://www.readbeyond.it/ebooks/b7b497df.html
See attached picture: a bar appears, Calibre is highlighting the sentences, but
I hear no sound.
With another Audio-ebook I get the same.
When I try Read Aloud with a regular ebook, without embedded audio, then
I do hear audio. See the other attached screenshot. Now the bar appears at the right top instead of the bottom center. It has an extra icon to configure the voices.
So:
1) Are EPUB3 audio-ebooks supposed to work?
2) If yes, how do I get audio? What can I try to debug the issue?
I have already run with 'calibre-debug -w <bookname>.epub' but there are no prints related to audio:
Code:
QPA platform: xcb
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 81.55183946488295 x 81.64285714285714
ApplicationPaletteChange event ignored
Using calibre Qt style: True
Path override failed for key base::DIR_APP_DICTIONARIES and path '/home/matthijs/calibre-bin/calibre/bin/qtwebengine_dictionaries'
Path override failed for key base::DIR_APP_DICTIONARIES and path '/home/matthijs/calibre-bin/calibre/libexec/qtwebengine_dictionaries'
Path override failed for key base::DIR_APP_DICTIONARIES and path '/home/matthijs/calibre-bin/calibre/libexec/qtwebengine_dictionaries'
[0.000] Load of book started
[0.002] prepared emitted
[0.040] webview loading requested
[0.186] bridge ready
[0.317] iframe ready
[0.417] loading finished
Path override failed for key base::DIR_APP_DICTIONARIES and path '/home/matthijs/calibre-bin/calibre/libexec/qtwebengine_dictionaries'