I've been using the PRO-HD for a few weeks now over a LAN on a couple of computers. I am seeing the same results on both computers, one being a Windows Vista AMD Phenom quad-core with 4 Gigs of RAM, the other being a Windows XP machine with a 2.6 GHz processor and 2 Gigs of RAM. The results seem the same on both computers over a wired 100 Mbps LAN. When you are watching a fast moving picture like a basketball game the picture will jitter after approximately 20 seconds. While monitoring the Stats window I verified that no Frames were skipped and the buffer was full. I tried downgrading the resolution to 1280x720 and 640x480 with the same results. I tried almost all the manual settings (I-Frame interval etc.) and the results seem the same.
So the facts are I have more then enough network bandwidth and more then enough client computing power (I monitored the client) and I tried lowering the resolution on the SlingPlayer 184.108.40.2062 with the same results. No matter what I do the picture will jitter once in a while (3 to 5 times a minute).
My conclusion is the physical SlingBox PRO-HD cannot encode and send the H.264 video stream quick enough to avoid picture jitters for fast moving video. I hope the guys at Sling Media can supply a firmware and/or software patch to fix this problem.
Firmware Version 2.1.90
Hardware Version 1.37.0
Firmware Date 11/30/2010
100 MbPS LAN
AMD Phenom X4 9100e 4 Gb RAM