Hi,
Please execute sudo jetson_clcoks and check again. There is a mamcpy of copying CPU buffer to NVMM buffer in nvvidconv:
‘video/x-raw,width=1920,height=1080,format=YUY2’ ! nvvidconv ! ‘video/x-raw(memory:NVMM),width=1920,height=1080,format=NV12’
Running CPUs in max clocks should bring improvement. You may also try other power mode such as sudo nvpmodel-m 0. Please refer to developer guide.