Nah, I noticed that. Have a look at http://mediadownloader.cz.cc/ It can play videos in Phonon well, and I passed the URL to QMediaPlayer manually and it worked, no cookies or forbidden stuff. The source code did get me lost though, too many functions are tied to other classes
QByteArray url = keyAndValue.first().replace("%2C", ",");
viewer.engine()->addPluginPath(QString("/opt/qtm12/plugins"));
export QT_PLUGIN_PATH=/opt/qtm12/plugins