After much Googling, I've not found the answers to my questions. This post is probably going to go long, mainly because I'm wordy but also because this issue is a bit more involved than, "hey, it's not working!" Or mostly because I'm wordy. I realize this forum is more for home theater systems, but I've found AVS to be invaluable resource—plenty of knowledgable folks around here.
Ultimately what I'm trying to accomplish is to send 720p output from a new Mac Mini into a TriCaster and into our two XGA projectors. Like so:
If I use Thunderbolt to HDMI cable->Kramer VM-2Hxl HDMI 1:2 DA->HDMI to DVI Cable it works for a few minutes but goes black. I've also tried going from that Kramer unit to my Blackmagic HDMI to SDI converter and into our TriCaster but that goes black too after a while.
I've tried using HDMI->Kramer DA and then into the scaler and SDI converter but no luck there either. When we just used DVI out of our old PC this was not a problem and all the other hardware worked perfectly.
So here's my thought process, and where I have questions:
- Why is the screen blanking? I'm guessing HDMI/HDCP handshake issues, considering the signal path is running through multiple units, some of which do not support any kind of HDCP (the Extron scaler, for one). The Kramer HDMI DA has the same feature that the Gefen HDMI Detective has: it'll grab EDID info from the sink device, save it, and send this back to your source, regardless of the actual sink that's plugged into the output sides of your DA. In my case, I'm using the Blackmagic EDID info to get a bog standard 720p output from the Mac Mini; the scaler and the TriCaster handle this beautifully—when it works.
- My biggest unanswered question: I thought that HDMI was like DVI, that it didn't always require encryption. Am I mistaken? Is HDMI always encrypted, even when the content running over it needn't be? Do all HDMI equipped devices, including cameras, supply encrypted signals?
- If this is truly the case, what can I do to get my Mac Mini to work here? I still need to end up with a signal path that allows me to mix the output of the Mac on the TriCaster, as well as display the output from the Mac on the projectors without first going through the TriCaster. Hence the HDMI 1:2 DA. Our use of the TriCaster is to mix in signals from video cameras as well as the output from the Mac so that we can broadcast our service to other rooms on campus (via network and dedicated HD-SDI runs).
Any help on this topic, or other places to look for answers, would be tremendous.