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我是 Gstreamer 的新手，所以如果这个问题非常简单，我深表歉意，但我已经被困太久了。

我在树莓派上使用 Mopidy 通过扬声器播放音乐。当 Mopidy 播放时，我希望能够使一些灯光与低频段、中频和高频段同步。据我了解，Mopidy 在后端使用 Gstreamer，您可以通过指定来自定义管道

[audio]
output= spectrum bands=3 ! autoaudiosink

我需要在频谱和接收器之间放置一些东西，以分析“频谱”在总线上发布的元素消息（除非有人有更好的主意）。我正在尝试在 python 中编写一个简单的元素，它通过音频但有一个可以实现我的自定义逻辑的消息处理元素。但是，我什至无法从简单的在线示例开始，因为我不知道如何让注册的元素让 gstreamer 识别它。当我遵循https://github.com/GStreamer/gst-python/blob/master/examples/plugins/python/identity.py上的 gst-python identity.py 示例时，规定的说明不起作用。

    jlc@FuzzPi:~/Rise $ export GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD
    jlc@FuzzPi:~/Rise $ GST_DEBUG=python:4 gst-launch-1.0 fakesrc num-buffers=10 ! identity_py ! fakesink
    WARNING: erroneous pipeline: no element "identity_py"

我已经尝试了所有可以想象的 GST_PLUGIN_PATH，并尝试了我能找到的每个在线帖子中的所有内容，我可能只是错过了一些非常基本的东西，但我真的可以用手弄清楚我错过了什么！据我所知，这不应该这么复杂。

我的操作系统是 Ubuntu MATE 16.04，我所有的 gstreamer 包的版本都是 >1.6

jlc@FuzzPi:~/Rise $ dpkg -l | grep gst
ii  gir1.2-gst-plugins-base-1.0            1.8.3-1ubuntu0.2                           armhf        GObject introspection data for the GStreamer Plugins Base library
ii  gir1.2-gstreamer-1.0                   1.8.3-1~ubuntu0.1                          armhf        GObject introspection data for the GStreamer library
ii  gstreamer1.0-alsa:armhf                1.8.3-1ubuntu0.2                           armhf        GStreamer plugin for ALSA
ii  gstreamer1.0-clutter-3.0               3.0.18-1                                   armhf        Clutter PLugin for GStreamer 1.0
ii  gstreamer1.0-libav:armhf               1.8.3-1ubuntu0.2                           armhf        libav plugin for GStreamer
ii  gstreamer1.0-nice:armhf                0.1.13-0ubuntu2                            armhf        ICE library (GStreamer plugin)
ii  gstreamer1.0-plugins-base:armhf        1.8.3-1ubuntu0.2                           armhf        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:armhf        1.8.3-1ubuntu0.4                           armhf        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:armhf        1.8.3-1ubuntu0.1                           armhf        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-plugins-ugly-amr:armhf    1.8.3-1ubuntu0.1                           armhf        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-pulseaudio:armhf          1.8.3-1ubuntu0.4                           armhf        GStreamer plugin for PulseAudio
ii  gstreamer1.0-tools                     1.8.3-1~ubuntu0.1                          armhf        Tools for use with GStreamer
ii  gstreamer1.0-x:armhf                   1.8.3-1ubuntu0.2                           armhf        GStreamer plugins for X11 and Pango
ii  libclutter-gst-3.0-0:armhf             3.0.18-1                                   armhf        Open GL based interactive canvas library GStreamer elements
ii  libgstreamer-plugins-base1.0-0:armhf   1.8.3-1ubuntu0.2                           armhf        GStreamer libraries from the "base" set
ii  libgstreamer-plugins-good1.0-0:armhf   1.8.3-1ubuntu0.4                           armhf        GStreamer development files for libraries from the "good" set
ii  libgstreamer1.0-0:armhf                1.8.3-1~ubuntu0.1                          armhf        Core GStreamer libraries and elements
ii  libreoffice-avmedia-backend-gstreamer  1:5.1.6~rc2-0ubuntu1~xenial1               armhf        GStreamer backend for LibreOffice
ii  python-gst-1.0                         1.6.2-1build1                              armhf        GStreamer GObject Introspection overrides for Python
ii  python-gst-1.0-dbg                     1.6.2-1build1                              armhf        GStreamer GObject Introspection overrides for Python (debug extensions)
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