Qt5 QupZilla HTML5 Video has no time length (Infinity:NaN:NaN:NaN)

[NickLion]

QupZilla built with Qt5 has annoying bug: any html5 video, e.g. youtube, has no time length (current time seems fine). Instead of correct length it shows Infinity:NaN:NaN:NaN. This also makes timeline broken.
Demo browser build with Qt5 and Otter Browser (also uses Qt5) show time length properly.

I'm using Qt5.3.2, 64-bit, Linux (openSUSE 13.1 x86_64).
QupZilla, 1.7.0 git (hash ed252c5)

[JHooverman]

This is unfortunately qtwebkit- and/ or maybe even youtube-related. If you visit this page, you will get the following results:

QupZilla (Application version: 1.7.0 (ed252c5), Qt version: 5.4.0, WebKit version: 538.1)

As you can instead of Infinity:NaN:NaN:NaN it displays 0:00.

QtTestbrowser (Qt version: 4.8.6, Webkit version: 537.21)

Displays the length correctly.

This is somehow releated to this Qt-Bug. It both described cases it is not possible to seek audio/ video.

Edit:
Otter-Browser (Application version: 0.9.03-dev, Qt version: 5.4.0, WebKit version: 538.1) will show the same results as QupZilla

[NickLion]

Hmm. Video in link you provide looks broken in qt5 test browser as well. But youtube: https://www.youtube.com/watch?v=YE7VzlLtp-4 played fine in Qt5 test browser & Otter:

[NickLion]

Sorry, my bad. That was flash plugin. For some reason, no flash menu is shown, so i didn't realize that.

[JHooverman]

Just for the records: An upstream bug for this issue exists.