Nvsdk nvEncInvalidateRefFrames not works

[reis.zm307]

Hi, Guys
It seems api nvEncInvalidateRefFrames does not work on my Quadro T1000 card.
It always returns zero with Whatever inputs.

Here is my HW&SW circumstance:
Quadro T1000
Win64+ NVSDK 11.1
Encodeing HEVC with UltraLowlatency preset

I found a previous post in. this forum

Missing functionality from the Drive SDK video encoder

Hi, We’re currently using a GTX 1050 as part of our product to encode video using the NVIDIA Video Codec SDK (NVIDIA VIDEO CODEC SDK | NVIDIA Developer). We’re trying to port this product to the PX2 (and the drive platform), but it seems that a functionality we depend on is missing: NvEncInvalidateRefFrames: I have not been able to locate a similar functionality in the Drive SDK. Alternatively, I have not been able to locate an implementation of the NVidia Video Codec SDK for the PX2. We re…

It seems some kind of platform do not support nvEncInvalidateRefFrames.
Anyone know in what nvsdk version or platform it works ?

Thanks.