AV1 streaming on L4

Hi there,
I am trying to do live stream transcoding with FFMPEG using Nvidia hardware acceleration on L4 GPU and I am getting error message like " Stream 0, codec av1, is muxed as a private data stream and may not be recognized upon reading." Stream 0 in this case is a video stream, audio encoded just fine and I can hear audio.
Here is my comand for transcoding:
ffmpeg -y -hide_banner -hwaccel_device 0 -hwaccel cuda -hwaccel_output_format cuda
-i “udp://
-c:v av1_nvenc -no-scenecut 1 -g 60 -preset p4 -tune hq -b:v 5M -vsync passthrough
-ac 2 -filter:a loudnorm -c:a libfdk_aac -b:a 128k -async 1
-f rtp_mpegts “rtp://
What am I doing wrong here, please help