I have a significant number of movies that were transcoded from a DVD to DivX MPEG4 that are stored on a disk on the same server that host the Channels Server.
When I watch them using the Movies interface on Channels the video is jittery, but when I watch using the VLC App on the same FireStick the video is perfect. VLC is accessing the video using it's local network interface where the files exists on a Windows share on the Channels server.
The movies are a variety of resolutions with the one I am using for testing being 720P at 24 FPS.