jetpack 4.3 fails to read video

hello everyone ,i have a problem when i finish jatpack4.3 in Xavier,and run a demo about read a video,but command interface prompt that make sure install NVENC in your PC. when i use old version like jatpack4.2.1\jatpack4.2.2\jatpack4.2.3 don’t have this problem.
https://wx2.qq.com/cgi-bin/mmwebwx-bin/webwxgetmsgimg?&MsgID=1040082305561476950&skey=%40crypt_d0a06e13_efe74158dcfb85898aa26881f5464d08

Please not duplicate issues. Let’s check in
https://devtalk.nvidia.com/default/topic/1069261/