Avenc_mpeg4 not installed in Deepstream 6.1.1 Docker images

avenc_mpeg4 does not seem to be installed in the tested Deepstream 6.1.1 Docker images:

nvcr.io/nvidia/deepstream 6.1.1-samples 262bf6f79805 10 days ago 10.5GB
nvcr.io/nvidia/deepstream 6.1.1-devel 7ae78050e65d 10 days ago 15.8GB

This is the output:
gst-inspect-1.0 avenc_mpeg4
No such element or plugin ‘avenc_mpeg4’

This is used in order to save output to file.

This issue started after upgrading from 6.1 to 6.1.1. The following container does have avenc_mpeg4 installed as expected.
nvcr.io/nvidia/deepstream 6.1-devel 0fe4a8960c59 3 months ago 15.9GB

Is there a reason it is not installed for 6.1.1? Is there a way to manually install it?

• Hardware Platform (Jetson / GPU): GPU
• DeepStream Version: 6.1.1
• NVIDIA GPU Driver Version (valid for GPU only): 515.65.01

Gstreamer libav plugins are open source project and distributed by ubuntu, they have nothing to do with DeepStream.
https://gstreamer.freedesktop.org/modules/gst-libav.html
https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c

Please run /opt/nvidia/deepstream/deepstream/user_additional_install.sh in the docker if you want to use the gstreamer plugins.

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