[mythtv-users] HDMI over IP

[Michelle Dupuis]

So long as they leave the IP payload encrypted (per HDCP) then there is
little risk...tapping into an HDMI data stream isn't hard.  Decrypting the
payload is. 

-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Mike Perkins
Sent: Wednesday, September 16, 2009 7:47 AM
To: Myth TV Users List
Subject: Re: [mythtv-users] HDMI over IP

Nick Rout wrote:
> On Wed, Sep 16, 2009 at 2:43 PM, Allen Edwards 
> <allen.p.edwards at gmail.com> wrote:
>> On Tue, Sep 15, 2009 at 7:40 PM, Nick Rout <nick.rout at gmail.com> wrote:
>>> On Wed, Sep 16, 2009 at 2:24 PM, Jean-Yves Avenard <jyavenard at gmail.com>
wrote:
>>>> 2009/9/16 Fa <fayoeu at gmail.com>:
>>>>> Just thought the people on this list might be interested in this 
>>>>> new product...  I am not endorsing it, I just think it is an 
>>>>> interesting product.
>>>>> http://justaddpower.com/VBS-Suite-for-High-Definition/82-HDMI-over
>>>>> -IP-Transmitter/flypage.tpl.html?pop=0
>>>>>
>>>> How can they reliably transfer a 2.25Gbit/s signal on a 100Mbit/s link
?
>>> There is a transmitter and a receiver. They must be doing something 
>>> to the stream. The pdf datasheet says "AV  signals  are transmitted 
>>> digitally over the CAT5/6/7 cable without any signal loss. Internal 
>>> JPEG  video  compression  adapts  to available network bandwidth  if 
>>> needed."
>>>
>>> Whatever that means, the second sentence seems to imply some 
>>> processing/compression.
>>> _
>> It sounds like they are just using Cat5 cable and not an IP protocol.
> 
> Yes it does, but their own advertising specifically disclaims that, eg:
> 
> "Not an HDMI Balun, but an HDMI over IP system. This means you can 
> create your own A/V Ethernet network and all of the recievers will 
> find the transmitter automatically. It may even be used over smaller 
> existing house networks and low cost LAN switches and routers."
> 
Doesn't this break one of the basic tents of HDMI? I thought that the signal
path had to be secure from end to end, so that no 'pyrates' could tap the
signal and make off with their precious IP?

If you turn the signal into genuine TCP/IP (as opposed to the other sort of
IP) then anyone can leech the signal and figure out how it all works.

-- 

Mike Perkins

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