Hi,
The default bitrate setting is 4Mbps, which is too small for 4K resolution. Please try with larger value. And please run in CBR and adjust virtual buffer size to get balance setting in bitrate and quality. May refer to
A bit strange nvv4l2decoder doe not work. Probably you don’t use JP4.4.1? There is a known issue on JP4.4:
If you run JP4.4, please remove h264parse plugin for a try.