QtWebKit crashes with VLC plugin on Linux

QtWebKit crashes on Ubuntu when VLC plugin is loaded. Backtrace with debug version of VLC plugin attached.

I can reproduce the problem with browser from QtWebKit examples taken from Ubuntu Trusty official repo and Qt 5.2 and in my application built and run against Qt 5.3.2.

I removed totem from my Ubuntu - otherwise it was used by default instead of VLC.

It may happen on every video. I tested this on few ones and I can reproduce the problem for example on "sample_mpeg4.mp4" file from this site: https://support.apple.com/en-us/HT201549