我创建了一个全新安装的Ubuntu 14.04.5 LTS（Trusty Tahr）的虚拟机，然后我安装了Qt 5.8。拱门是x64。
我尝试执行以下示例： http://doc.qt.io/qt-5/qtmultimedia-multimediawidgets-player-example.html，结果是错误：
defaultServiceProvider::requestService(): no service found for -
"org.qt-project.qt.mediaplayer"
我启用了QT_DEBUG_PLUGINS = 1变量并看到：
Got keys from plugin meta data ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/QtWorkspace/bin/mediaservice" ...
Cannot load library /home/user/Qt/5.8/gcc_64/plugins/mediaservice/libgstmediaplayer.so: (/home/user/Qt/5.8/gcc_64/plugins/mediaservice/../../lib/libqgsttools_p.so.1: undefined symbol: _gst_value_list_type)
QLibraryPrivate::loadPlugin failed on "/home/user/Qt/5.8/gcc_64/plugins/mediaservice/libgstmediaplayer.so" : "Cannot load library /home/user/Qt/5.8/gcc_64/plugins/mediaservice/libgstmediaplayer.so: (/home/user/Qt/5.8/gcc_64/plugins/mediaservice/../../lib/libqgsttools_p.so.1: undefined symbol: _gst_value_list_type)"
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
“libqgsttools_p.so.1：undefined symbol：_gst_value_list_type”错误的原因是什么？为什么会出现这种不匹配？ QtMultimedia是否可能不支持GStreamer 1.0（Trusty附带GStreamer 1.2.4）？