Bug#753471: konqueror: Black picture when trying to play youtube videos using html5

[Petter Reinholdtsen <pere@hungry.com>]

Package: konqueror
Version: 4:4.12.4-1
Severity: normal

Dear Maintainer,

Not sure if this problem is with a library or the konqueror
application as such, so I start by filing the bug against konqueror.
Did not find a similar bug already reported.

When I visit youtube on a freshly installed Jessie desktop and try to
watch a video, the video player seem to start as it should, show the
duration and playout position, and even play the sound sound, but
there is no image.  Only a black video frame.

See for example <URL: http://www.youtube.com/watch?v=o6voAW_Go5Y >,
which is working fine in Iceweasel, but not in konqueror.

Could it be a problem with the canvas support in konqueror, incorrect
X settings or something else?

-- System Information:
Debian Release: jessie/sid
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.14-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=nb_NO.utf8, LC_CTYPE=nb_NO.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages konqueror depends on:
ii  install-info            5.2.0.dfsg.1-4
ii  kde-baseapps-bin        4:4.12.4-1
ii  kde-baseapps-data       4:4.12.4-1
ii  kde-runtime             4:4.13.1-1
ii  libc6                   2.19-4
ii  libkactivities6         4:4.13.1-1
ii  libkcmutils4            4:4.13.1-1
ii  libkde3support4         4:4.13.1-1
ii  libkdecore5             4:4.13.1-1
ii  libkdesu5               4:4.13.1-1
ii  libkdeui5               4:4.13.1-1
ii  libkfile4               4:4.13.1-1
ii  libkhtml5               4:4.13.1-1
ii  libkio5                 4:4.13.1-1
ii  libkonq5abi1            4:4.12.4-1
ii  libkonqsidebarplugin4a  4:4.12.4-1
ii  libkparts4              4:4.13.1-1
ii  libqt4-dbus             4:4.8.6+dfsg-2
ii  libqt4-qt3support       4:4.8.6+dfsg-2
ii  libqt4-xml              4:4.8.6+dfsg-2
ii  libqtcore4              4:4.8.6+dfsg-2
ii  libqtgui4               4:4.8.6+dfsg-2
ii  libstdc++6              4.9.0-7
ii  libx11-6                2:1.6.2-2

Versions of packages konqueror recommends:
ii  dolphin              4:4.12.4-1
ii  kfind                4:4.12.4-1
ii  konqueror-nsplugins  4:4.12.4-1
ii  kpart-webkit         1.3.2-2

Versions of packages konqueror suggests:
ii  konq-plugins  4:4.12.4-1

-- no debconf information