本文以上一期 Python 版的 deepstream-test1 deepstream-teat1-usbcam 与 deepstream-teat1-rtsp-out 中，分别将输入源 从视频文件变成 USB 摄像头 ，以及将输出 从显示屏变成 RTSP 视频流 。接下去同样从代码内容来看看这两个部分需要进行怎样的修改。文件路径： /sources/deepstream_python_apps/apps的deepstream-test1-usbcam/deepstream_test_1_usb.py 范例功能：将 deepstream-test1 的视频文件输入改成 USB 摄像头 插件流：v4l2src --> videoconvert--> nvvideoconvert --> nvstreammux --> nvinfer --> nvvideoconvert --> nvdsosd --> nvegltransform --> nveglglessink 将原本数据源插件从 filesrc 改成 v4l2src 将原本格式转换插件从 h264 相关的，改成符合 USB 摄像头原始数据格式相关的 source = Gst.ElementFactory.make("filesrc", "file-source")
h264parser = Gst.ElementFactory.make("h264parse", "h264-parser")
decoder = Gst.ElementFactory.make("nvv4l2decoder", "nvv4l2-decoder")
streammux = Gst.ElementFactory.make("nvstreammux", "Stream-muxer") 复制代码 source = Gst.ElementFactory.make("v4l2src","usb-cam-source")
caps_v4l2src = Gst.ElementFactory.make("capsfilter","v4l2src_caps")
vidconvsrc = Gst.ElementFactory.make("videoconvert","convertor_src1")
nvvidconvsrc=Gst.ElementFactory.make("nvvideoconvert","convertor_src2")
caps_vidconvsrc = Gst.ElementFactory.make("capsfilter","nvmm_caps")
streammux = Gst.ElementFactory.make("nvstreammux","Stream-muxer") 复制代码 caps_v4l2src.set_property('caps',Gst.Caps.from_string("video/x-raw, framerate=30/1"))
caps_vidconvsrc.set_property('caps', \ Gst.Caps.from_string("video/x-raw(memory:NVMM)"))
source.set_property('device',args[1])
。。。。
sink.set_property('sync',False) 复制代码 cd<deepstream< span="">根目录>/sources/deepstream_python_apps/app
cd deepstream-test1-usbcam
python3 deepstream_test_1_usb.py 复制代码 文件路径：/sources/deepstream_python_apps/apps的deepstream-test1-rtsp-out/deepstream_test1_rtsp_out.py 范例功能：将 deepstream-test1 的输出透过 RTSP 协议转向其他电脑 修改重点：在 nvdsosd 之后添加将格式转成符合 RSTP 协议的 H264 格式，主要如下： sudo apt update
sudo apt-get install libgstrtspserver-1.0-0 gstreamer1.0-rtsp
sudo apt-get install libgirepository1.0-dev
sudo apt-get install gobject-introspection gir1.2-gst-rtsp-server-1.0 复制代码 nvvidconv_postosd = Gst.ElementFactory.make("nvvideoconvert", "convertor_postosd")
# 创建caps过滤器
caps = Gst.ElementFactory.make("capsfilter", "filter")
caps.set_property("caps", Gst.Caps.from_string("video/x-raw(memory:NVMM), format=I420"))
# 根据输入参数选择使用的编码器，预设为H264
if codec == "H264":
encoder = Gst.ElementFactory.make("nvv4l2h264enc", "encoder")
elif codec == "H265":
encoder = Gst.ElementFactory.make("nvv4l2h265enc", "encoder")
encoder.set_property('bitrate', bitrate)
# 如果是在 Jetson 设备上，执行下面的设定
if is_aarch64():
encoder.set_property('preset-level', 1)
encoder.set_property('insert-sps-pps', 1)
encoder.set_property('bufapi-version', 1)
# 使有效负载将视频编码为RTP数据包
if codec == "H264":
rtppay = Gst.ElementFactory.make("rtph264pay", "rtppay")
elif codec == "H265":
rtppay = Gst.ElementFactory.make("rtph265pay", "rtppay")
# 建立 UDP 接收器
updsink_port_num = 5400
sink = Gst.ElementFactory.make("udpsink", "udpsink")
# 设定接收器的值
sink.set_property('host', '224.224.255.255')
sink.set_property('port', updsink_port_num)
sink.set_property('async', False)
sink.set_property('sync', 1) 复制代码 https://github.com/GStreamer/gst-rtsp-server # Start streaming
rtsp_port_num = 8554 # 设定端口值
server = GstRtspServer.RTSPServer.new()
server.props.service = "%d" % rtsp_port_num
server.attach(None)
factory = GstRtspServer.RTSPMediaFactory.new()
factory.set_launch( "( udpsrc name=pay0 port=%d buffer-size=524288 caps="application/x-rtp, media=video, clock-rate=90000, encoding-name=(string)%s, payload=96 " )" % (updsink_port_num, codec))
factory.set_shared(True)
server.get_mount_points().add_factory("/ds-test", factory) # 设定加载点 复制代码 rtsp://192.168.55.1:8554/ds-test ”（如下图）# 在DeepStream设备（如Jetson Nano 2GB）
cd<deepstream< span="">根目录>/sources/deepstream_python_apps/apps
cd deepstream-test1-rtsp-out
ln -s ../../../../samples/streams/sample_720p.h264 sample_720.h264
python3 deepstream_test_1_usb.py -i sample_720.h264 复制代码 
置顶卡
变色卡
千斤顶
