**Before you start with deepstream, please make sure you are familiar with gstreamer knowledge and coding skills. ** GStreamer: open source multimedia framework
DeepStream is a SDK. deepstream-app is one of the sample applications to show how to use DeepStream APIs.
https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_C_Sample_Apps.html
https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_ref_app_deepstream.html
The inference result is stored in deepstream Metadata.MetaData in the DeepStream SDK — DeepStream 6.3 Release documentation
In every FrameMeta, there is “source_id” which identify which stream(source) it belongs to. https://docs.nvidia.com/metropolis/deepstream/sdk-api/Meta/_NvDsFrameMeta.html