Gst-launch-1.0 playbin can not play video (but can hear only audio)

Using the following gst-launch-1.0 command, the video does not show but can here audio clearly.

gst-launch-1.0 playbin uri=

Can you suggest me how to solve the problem?

I have installed all gstreamer 1.0 packages as following:

sudo apt-get install libgstreamer1.0-0 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

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU) dGPU (laptop)
• DeepStream Version 5.0
• JetPack Version (valid for Jetson only) N/A
• TensorRT Version : 7.6
• NVIDIA GPU Driver Version (valid for GPU only) 450.80
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

I think it has nothing to do with deepstream. It is open source gstreamer ubuntu distribution version problem. It is better to consult ubuntu. The test stream contains vp8 video and vorbis audio which are all supported by gstreamer open sources. The possible failure may be caused by the video sink. You need to check which video sink is used by playbin and whether the related drivers have be installed to support the video sink.

Now I rebuild the fresh ubuntu 18.04. After that I have installed the CUDA-10.2 + GPU Driver-450.80.

Also installed the gstreamer-1.0 packages. Now gst-launch-1.0 playbin can show both the video and audio.

Thanks, for your suggestions