for Pi : 錯誤 GStreamer-CRITICAL **: gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed

 GStreamer-CRITICAL **: gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed

這只是很單純的plug-in沒安裝的問題,

那就是要一個一個plug-in安裝的指令下達才行,

從什麼地方看出來?

先用「sudo apt-get install gstreamer1*」來看,它須要哪些套件

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Reading package lists... Done Building dependency tree Reading state information... Done Note, selecting 'gstreamer1.0-videosink' for glob 'gstreamer1*' ...

...

....

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沒安裝,對吧,那我就一個一個裝,先裝「gstreamer1.0-videosink」

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sudo apt-get install gstreamer1.0-videosink
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package gstreamer1.0-videosink is a virtual package provided by:
  gstreamer1.0-x 1.10.4-1+deb9u1
  gstreamer1.0-plugins-good 1.10.4-1
  gstreamer1.0-plugins-bad 1.10.4-1
  gstreamer1.0-dvswitch 0.1.1-1
You should explicitly select one to install.

---------------------------

是的,它說了,你要explicitly select one to install,

所以老老實實地apt-get install gstreamer1.0-x 1.10.4-1+deb9u1 gstreamer1.0-plugins-good .....
都裝完後
再回去跑gstreamer,就不會出現

「GStreamer-CRITICAL **: gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed」

錯誤訊息了
(那就剩下畫質的問題要解決了,這又是另一個故事了)

大家加油吧