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RJ-45 category 5?
It really depend, it may be analog, after all, some high end audio hardware use cat5 cable for the better shielding than regular audio cable. If it is digital, then it really depend. It can have a wide variety of codecs, from RAW (no codec) to full h.264. If PXE is on the same cable, then it probably is using TCP/IP, so you can at least get the stream to Linux. If it don't, you will need a custom driver, let's hope it is not the case. So, the questions are:
-Does it use TCP/IP, do you have an IP address for the RJ-45 port
-If yes, you you have the ip of the server
-If yes, if you install WireShark, do you see a lot of traffic from this IP (server ip)
-If no, you can make/buy a hub and put it between the server and the client and connect the second output to your PC so you can use Wireshark to grab some packets so you can get more informations about the traffic
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-If you open VLC and try many streaming protocol in the "advanced open" section, does it work?
Given the fact that it is probably a proprietary protocol to prevent users from using it with free software (to prevent piracy), it may be obfuscated, witch will make reverse engineering close to impossible if there is no trivial solutions. However, there is a workaround to use it on your PC. You need to built or buy a little LIRC transmitter, it is normally really easy to built, but also cheap on e-bay. Then you can have a virtual remote control to control one of the SetTop then get the video using a 9.99$ RCA to USB converter on DealExtreme.com. MythTV (with some tweak) will then be able to control the SetTop, switch channel, record, replay and so on. It is probably the easiest way to get it to work. Reverse engineering is cool and all, but it's a lot longer.
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