JetPack 4.2 — L4T R32.1 release for Jetson AGX Xavier, Jetson TX2, and Jetson Nano

Are there any instructions on how to actually get the multimedia api samples running after the sdk manager installation of jetpack 4.2?

I’m fine with either cross compiling or compiling on the xavier itself. Other forum posts have mentioned downgrading to the older installer to do anything ( https://devtalk.nvidia.com/default/topic/1048996/jetson-agx-xavier/cross-compile-for-jetson-xavier-/ ). This seems less than ideal.