How to use gst-launch-1.0 to run detection and display for the input video?

I am using the commands like :
gst-launch-1.0 filesrc location=file:///opt/nvidia/deepstream/deepstream/samples/streams/sample_1080p_h264.mp4 ! h264parser ! nvv4l2decoder ! m.sink_0 nvstreammux name=m batch-size=1 width=1280 height=720 ! nvinfer config-file-path=/opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app/config_infer_primary.txt ! nvvideoconvert ! 'video/x-raw(memory:NVMM),format=RGBA' ! nvmultistreamtiler ! nvdsosd ! nvvideoconvert ! nveglglessink

And it says:
Warning: Error pipeline: No component 'h264parser'
Is it because I don’t install something?

I just run it successfully ,but in the python environment,I don’t know why

https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_Installation.html#install-prerequisite-packages

sudo apt install \
libssl3 \
libssl-dev \
libgstreamer1.0-0 \
gstreamer1.0-tools \
gstreamer1.0-plugins-good \
gstreamer1.0-plugins-bad \
gstreamer1.0-plugins-ugly \
gstreamer1.0-libav \
libgstreamer-plugins-base1.0-dev \
libgstrtspserver-1.0-0 \
libjansson4 \
libyaml-cpp-dev

There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks

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