GStreamer手把手入坑
一、简介
百度。
这里是我入坑的学习资料《GStreamer应用开发手册学习笔记之二》：
https://blog.csdn.net/fireroll/article/details/46859973
这里可参阅一些GStreamer安装、shell命令行：
https://www.cnblogs.com/dong1/p/10423743.html
这里是我参考的gstreamer接入rtsp博客《gstreamer如何接入RTSP流（IP摄像头）的代码范例》：
https://blog.csdn.net/quantum7/article/details/82151637?utm_source=blogxgwz0
二、安装
版本GStreamer-1.14.5
sudo apt install \
libssl1.0.0 \
libgstreamer1.0-0 \
gstreamer1.0-tools \
gstreamer1.0-plugins-good \
gstreamer1.0-plugins-bad \
gstreamer1.0-plugins-ugly \
gstreamer1.0-libav \
libgstrtspserver-1.0-0 \
libjansson4=2.11-1
三、命令行
gstreamer调用摄像头并显示：
gst-launch-1.0 rtspsrc location="rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0" ! rtph264depay ! avdec_h264 ! autovideosink
或：gst-launch-1.0 rtspsrc latency=2000 location="rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0" ! rtph264depay ! h264parse ! avdec_h264 ! autovideosink
基于Jetson平台：
#----------------------- GStreamer use rtsp camera -----------------------
gst-launch-1.0 rtspsrc latency=20 location="rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0" ! rtph264depay ! h264parse ! avdec_h264 ! nveglglessink
#----------------------- use dsexample plugin -----------------------
# use mp4 files
gst-launch-1.0 filesrc location=/opt/nvidia/deepstream/deepstream-4.0/samples/streams/sample_720p.mp4 ! qtdemux ! h264parse ! nvv4l2decoder ! m.sink_0 nvstreammux name=m batch-size=1 width=1280 height=720 ! nvvideoconvert ! dsexample full-frame=1 ! nvdsosd ! nvegltransform ! nveglglessink
# use rtsp camera
gst-launch-1.0 rtspsrc latency=2000 location="rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0" ! rtph264depay ! h264parse ! nvv4l2decoder ! m.sink_0 nvstreammux name=m batch-size=1 width=1280 height=720 ! nvvideoconvert ! dsexample full-frame=1 ! nvdsosd ! nvegltransform ! nveglglessink
使用gst-inspect-1.0命令，可以查看GStreamer有哪些插件：
./gst-inspect-1.0 -h
用法：
gst-inspect-1.0 [选项...] [ELEMENT-NAME | PLUGIN-NAME]
帮助选项：
-h, --help 显示帮助选项
--help-all 显示全部帮助选项
--help-gst 显示 GStreamer 选项
应用程序选项：
-a, --print-all 打印全部组件
-b, --print-blacklist 显示黑名单文件列表
--print-plugin-auto-install-info 显示机器可解析的指定插件或所有插件提供的特性列表。
与外部自动插件安装机制连接时有用
--plugin 列出插件信息
--exists Check if the specified element or plugin exists
--atleast-version When checking if an element or plugin exists, also check that its version is at least the version specified
-u, --uri-handlers 打印所支持的 URI 样式及它们的关联组件
--version Print version information and exit
四、学习代码
我将我学习GStreamer的程序代码提交到了Github，项目名gstreamer_learn。
Github地址：https://github.com/tosonw/gstreamer_learn
gstreamer_learn
我用来学习GStreamer的程序，内部有多个demo，只依赖GStreamer，可以自己编译并运行、调试和学习。
依赖：GStreamer
sudo apt install \
libssl1.0.0 \
libgstreamer1.0-0 \
gstreamer1.0-tools \
gstreamer1.0-plugins-good \
gstreamer1.0-plugins-bad \
gstreamer1.0-plugins-ugly \
gstreamer1.0-libav \
libgstrtspserver-1.0-0 \
libjansson4=2.11-1
编译：
mkdir build
cd build
cmake ..
make
运行：
./demo_1_version_
./demo_2_init_
./demo_3_element_fac_
./demo_4_get_element_info_
./demo_5_link_elements_
./demo_6_pads_
./demo_8_helloworld_
./demo_gstreamer_rtsp_
五、gst插件
这个可以自行百度。
不过我是根据deepstream官方教程一步步了解的，具体还在研究中，如有需要请自行查阅：
官方文档《NVIDIA DeepStream插件手册》：https://docs.nvidia.com/metropolis/deepstream/dev-guide/DeepStream%20Development%20Guide/deepstream_custom_plugin.html#wwpID0E0TB0HA