【发布时间】：2017-06-04 05:11:41
【问题描述】：
我刚刚升级了 ubuntu 16.10，现在我在使用 QtMultimedia 5.7 时遇到了一些问题。
尝试从 qml 访问相机时出现以下错误。
(main:8542): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(main:8542): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(main:8542): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(main:8542): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(main:8542): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(main:8542): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(main:8542): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
(main:8542): GStreamer-CRITICAL **: gst_element_get_bus: assertion 'GST_IS_ELEMENT (element)' failed
(main:8542): GStreamer-CRITICAL **: gst_bus_add_watch_full: assertion 'GST_IS_BUS (bus)' failed
(main:8542): GStreamer-CRITICAL **: gst_bus_set_sync_handler: assertion 'GST_IS_BUS (bus)' failed
(main:8542): GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed
(main:8542): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
(main:8542): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
(main:8542): GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed
(main:8542): GStreamer-CRITICAL **: gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed
(main:8542): GLib-GObject-CRITICAL **: g_object_get: assertion 'G_IS_OBJECT (object)' failed
(main:8542): GStreamer-CRITICAL **: gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed
(main:8542): GStreamer-CRITICAL **: gst_bus_set_sync_handler: assertion 'GST_IS_BUS (bus)' failed
(main:8542): GStreamer-CRITICAL **: gst_object_unref: assertion 'object != NULL' failed
(main:8542): GStreamer-CRITICAL **: gst_object_unref: assertion 'object != NULL' failed
根据我的阅读，这是 ubuntu 16.10 删除 gstreamer 0.10 的问题。但是尝试安装 gstreamer 0.10 并没有导致任何变化。
当尝试播放视频而不是访问相机时，我收到以下错误消息：
Warning: "No decoder available for type 'video/quicktime, variant=(string)iso'."
Error: "Your GStreamer installation is missing a plug-in."
除了从源代码手动编译 Qt 以使用 gstreamer 1.0 之外，还有什么技巧吗？
【问题讨论】：
-
尝试：libgstreamer-plugins-bad 和 gstreamer1.0-plugins-good
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我已经有 gstreamer1.0-plugins-good 并且 libgstreamer-plugins-bad 不在存储库中。
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@NatureShade ，你的问题解决了吗？？
标签： qt ubuntu gstreamer qtmultimedia