Qt多媒體gstreamer錯誤

Question

我剛剛升級了ubuntu 16.10，現在我遇到了QtMultimedia 5.7的一些問題。

嘗試從qml訪問相機時出現以下錯誤。

(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

據我所知，這是ubuntu 16.10丟棄gstreamer 0.10的問題 。 但是，嘗試安裝gstreamer 0.10並沒有導致任何變化。

嘗試播放視頻而不是訪問相機時，我收到以下錯誤消息：

Warning: "No decoder available for type 'video/quicktime, variant=(string)iso'."
Error: "Your GStreamer installation is missing a plug-in."

除了從源代碼手動編譯Qt以及使用gstreamer 1.0之外，還有其他技巧嗎？

Answer 1

警告建議您缺少qtdemux ，這是“gst-plugins-good”的一部分

嘗試，首先在命令下面查看你是否缺少qtdemux命令。

gst-inspect-1.0 qtdemux