What encodings on nvenc are supported by T4?

My Env)

$ nvidia-smi 
Wed Mar 25 12:29:23 2020       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.64.00    Driver Version: 440.64.00    CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Tesla T4            On   | 00000000:01:00.0 Off |                    0 |
| N/A   27C    P8     9W /  70W |      0MiB / 15109MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|  No running processes found                                                 |
+-----------------------------------------------------------------------------+
$ nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2019 NVIDIA Corporation
Built on Sun_Jul_28_19:07:16_PDT_2019
Cuda compilation tools, release 10.1, V10.1.243
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic
$ deepstream-app --version
deepstream-app version 4.0.2
DeepStreamSDK 4.0.2

I noticed VP8 and VP9 encoders won’t work as follows.

$ gst-launch-1.0 videotestsrc ! queue ! nvvideoconvert ! nvv4l2vp8enc ! matroskamux ! filesink location=nv_vp8.mkv
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
ERROR: from element /GstPipeline:pipeline0/nvv4l2vp8enc:nvv4l2vp8enc0: Device '/dev/nvhost-msenc' failed during initialization
Additional debug info:
gstv4l2object.c(4050): gst_v4l2_object_set_format_full (): /GstPipeline:pipeline0/nvv4l2vp8enc:nvv4l2vp8enc0:
Call to S_FMT failed for YM12 @ 320x240: Unknown error -1
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
$ gst-launch-1.0 videotestsrc ! queue ! nvvideoconvert ! nvv4l2vp9enc ! matroskamux ! filesink location=nv_vp9.mkv
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/nvv4l2vp9enc:nvv4l2vp9enc0: Encoder on device /dev/nvhost-msenc has no supported output format
Additional debug info:
gstv4l2videoenc.c(448): gst_v4l2_video_enc_open (): /GstPipeline:pipeline0/nvv4l2vp9enc:nvv4l2vp9enc0
Setting pipeline to NULL ...
Freeing pipeline ...

Both of h264 and h265 work fine.

$ gst-launch-1.0 videotestsrc ! queue ! nvvideoconvert ! nvv4l2h264enc ! h264parse ! matroskamux ! filesink location=nv_h264.mkv
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:02.204977393
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
$ gst-launch-1.0 videotestsrc ! queue ! nvvideoconvert ! nvv4l2h265enc ! h265parse ! matroskamux ! filesink location=nv_h265.mkv
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:02.885758715
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

I can not find which encoders on nvenc are supported by T4.
So, can you clarify?

Check this, NVENC do not support vp8 or vp9 encoding.