qt 5.5 + "integrate video in interface" crops video

Video output seems to be broken with qt 5.5 + "integrate video in interface". Only a small rectangle of the video is visible in the corner. See the attached image. Unticking the "integrate video in interface" shows the video in a separate window without issues.

Additional info: Gentoo linux, vlc 2.2.1 compiled with --enable-qt=5, qt 5.5.1, kde plasma, Intel integrated graphics. Seems to happen with every video I've tested so far.

Debug messages, verbosity=debug: avcodec warning: plane 0 not aligned avcodec warning: disabling direct rendering avcodec debug: enabling direct rendering core debug: VoutDisplayEvent 'resize' 1280x681 window core debug: VoutDisplayEvent 'resize' 1280x720 window avcodec warning: plane 0 not aligned avcodec warning: disabling direct rendering avcodec debug: enabling direct rendering avcodec warning: plane 0 not aligned avcodec warning: disabling direct rendering

Related gentoo bug: https://bugs.gentoo.org/show_bug.cgi?id=563458