我正在尝试从 Raspberry Pi 4 运行 UDP 流，并使用它安装了 gstreamer，在 gstreamer 的文档中找到：
$ sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
libgstreamer-plugins-bad1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-good \
gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools \
gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio
此外，我已经安装了 x264 和 v4l-utils。但是，当尝试执行诸如
$ gst-launch-1.0 videotestsrc
$ gst-launch-1.0 v4l2src
它失败并出现错误
ERROR: pipeline could not be constructed: no element "videotestsrc"
ERROR: pipeline could not be constructed: no element "v4l2src"
以前帖子上的一些答案是运行，无论输入什么gst-inspect-1.0 videotestsrc，它总是给我。symbol lookup error: gst-inspect-1.0: undefined symbol: GST_CAT_DEFAULT
我也尝试过运行export LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/liband sudo ldconfig，但没有成功。
到目前为止，完全重新安装 Gstreamer 还没有成功。有任何想法吗？