[mythtv-users] HDMI over IP

[Andrew Herron]

Well we already use 1-8 HDMI/HDCP compliant splitters to do this. ie one
HDMI/HDCP source replicated to 8 HDMI outputs so i can see that this would
be any different for this product.

Andrew

On Wed, Sep 16, 2009 at 4:47 PM, Allen Edwards <allen.p.edwards at gmail.com>wrote:

> The interesting thing is that it says you can feed multiple displays.
> That isn't in the DHCP spec and one wonders if all the displays have
> to be DHCP or if only one does.  Maybe I am not clear.  The source is
> going to insist that there is a valid HDMI display device before it
> sends anything out.  If there are 10 displays, there isn't anything in
> the spec that I know of that allows this.  If the source is only
> looking for one valid device, then do the others just work?  What
> about displays that insist on valid HDMI sources?  Will they all get
> the word that the source is DHCP?  In other words, the spec is set up
> for a handshake between source and display.  How do you shake hands
> with 10 displays at once.
>
> I had a non HDMI projector and a HDMI DVD player.  I had this DHCP
> compliant splitter/amplifier that would handshake with the source and
> everything worked.  As there was no splitter in the spec, they just
> had the splitter do the handshake and passed the data to both outputs.
>  Everything worked fine until I got a new display that was HDMI
> compliant and it wouldn't display because the splitter would not
> handshake with the display, just the source.  Now I have this
> wonderful splitter/amplifier that I used to drive my very long HDMI
> cable which no longer works.  I also have to turn on the projector
> before the DVD player or nothing works.  I hate copy protection.  It
> is a pain in the butt.
>
> Allen
>
>
> On Wed, Sep 16, 2009 at 5:27 AM, Michelle Dupuis <support at ocg.ca> wrote:
> > 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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