Question

我刚刚升级了ubuntu 16.10，现在我遇到了QtMultimedia 5.7的一些问题。

尝试从qml访问摄像头时出现以下错误。

(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

据我所知，这是ubuntu 16.10丢弃 gstreamer 0.10 的问题。但是，尝试安装gstreamer 0.10并没有导致任何变化。

尝试播放视频而不是访问相机时，出现以下错误消息：

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以及使用gstreamer 1.0之外，还有其他技巧吗？

Answer 1

警告提示您缺少 qtdemux ，它是“ gst-plugins-good”的一部分

尝试下面的第一个命令，看看您是否缺少qtdemux命令。

gst-inspect-1.0 qtdemux

Qt多媒体gstreamer错误

1 个答案: