# Usage of deepstream-test4-app with USB camera

**URL:** <https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715>\
**Category:** DeepStream SDK\
**Created:** [September 28, 2020, 5:21am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715 "2020-09-28T05:21:16Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![A\_Y](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@A\_Y](https://forums.developer.nvidia.com/u/A_Y)\
**Post date:** [September 28, 2020, 5:21am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/1 "2020-09-28T05:21:16Z")

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I would like to use the deepstream-test4-app with USB camera through kafka server and I achieved it with DeepStream 5.0 Developer Preview for Jetson. However, I could not have done it with the newest version of DeepStream 5.0 for Jetson even though I used the same commands as successful one.

Here is the error message:  
One element could not be created. Exiting.

\*\*• Hardware Platform : TX2 and JAX  
\*\*• DeepStream Version : DeepStream 5.0 for Jetson  
\*\*• JetPack Version : Jetpack 4.4 [L4T 32.4.3]  
\*\*• TensorRT Version : 7.1.3.0  
\*\*• Issue Type : questions and bugs

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**Author:** ![Amycao](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/amycao/32/11342_2.png) [@Amycao](https://forums.developer.nvidia.com/u/Amycao)\
**Post date:** [September 28, 2020, 10:04am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/3 "2020-09-28T10:04:07Z")

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Please specify details about your issues.

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**Author:** ![A\_Y](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@A\_Y](https://forums.developer.nvidia.com/u/A_Y)\
**Post date:** [October 2, 2020, 8:39am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/4 "2020-10-02T08:39:57Z")

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I found out the cause that is what msgconv element could not be created but, I could have generated it when I used the DeepStream 5.0 DP.  
When I utilized the DeepStream 5.0 GA, this issue happens.

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**Author:** ![A\_Y](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@A\_Y](https://forums.developer.nvidia.com/u/A_Y)\
**Post date:** [October 9, 2020, 2:00am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/5 "2020-10-09T02:00:57Z")

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I found that msgconv element could not be created when I used not the DeepStream 5.0 DP but DeepStream 5.0 GA.  
However, I don’t know the issue happens. So, could you please support to fix it?

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**Author:** ![Amycao](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/amycao/32/11342_2.png) [@Amycao](https://forums.developer.nvidia.com/u/Amycao)\
**Post date:** [October 10, 2020, 8:35am UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/6 "2020-10-10T08:35:58Z")

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It should not happen, msgconv element could not be created, please check your environments. clear the cache, and try again.  
rm .cache/gstreamer-1.0/ -rf

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**Author:** ![TomNVIDIA](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/tomnvidia/32/14181_2.png) [@TomNVIDIA](https://forums.developer.nvidia.com/u/TomNVIDIA)\
**Post date:** [October 12, 2021, 4:16pm UTC](https://forums.developer.nvidia.com/t/usage-of-deepstream-test4-app-with-usb-camera/155715/8 "2021-10-12T16:16:21Z")

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Closed on October 12, 2021, 4:16pm UTC