Building the Qt port with --video doesn't actually provide video support -- but video support for the Qt port is implemented (enabled when WebKit is built inside the Qt source). From a quick look at the Makefiles, I think --video should set QT_CONFIG += phonon for the qt build.
Created attachment 32634 [details] Patch to fix Phonon includes The problem is that there is no such path $QTDIR/include/Phonon in a vanilla Qt installation. This patch removes "Phonon/" since the proper phonon include path is already applied by qmake.
Landed in r48122