nvtracker not working in DS 4.0 Nano

This is my pipeline:

uridecodebin ! nvstreammux ! plugin1 ! nvtracker ! plugin2 ! nvdsosd ! …

I get this error:

Creating LL OSD context new
gstnvtracker: Loading low-level lib at (null)
gstnvtracker: Failed to load NvMOT_Init
gstnvtracker: Failed to initilaize low level lib.

What are ll-config-file and ll-lib-file?
Will nvtracker work if defaults are used?
Which properties of nvtracker are required?

I would like the behaviour of the new nvtracker to be
as close as possible to the one in TX2 DS 1.5 .

OK, from dstest2_tracker_config.txt I see almost everything is mandatory.

My remaining question is which low-level tracker lib is closest to the
one in TX2 DS 1.5 .

Hi,

The overall API for nvtracker is similar.
You can find more detail in our document:
https://docs.nvidia.com/metropolis/deepstream/4.0/dev-guide/index.html#page/DeepStream_Development_Guide%2Fdeepstream_app_config.3.3.html

Thanks.