Blackmagic Forum

Here is my setup:
Everything is currently at 1080i

3 JVC GY-HM650U cams > HD-SDI cables > BMD Atem 1 M/E prod switcher
and:
iMac running ProPresenter4 > thunderbolt to HDMI > Kramer VS-48H HDMI switcher > out 1 to projector, out 2 to Atem 1 via HDMI w/ Kramer Cat5 extenders.

Here is the problem:
When I run the iMac > Kramer > Atem 1 the picture will come on and off about 12 times with a couple of those being scrambled and the image is more purple than it should be then it goes black. If I bypass the Kramer and run the iMac straight into the HDMI w/ Cat5 extenders into the Atem 1 the picture comes in perfectly.

I thought this was an EDID issue but I went through the process of acquiring the EDID data for the Atem 1 same problem. I also used the default EDID setting in the Kramer same problem. I also used the projector set at 1080i and acquired that EDID and then plugged the Atem back into that output to try and trick it into sending the correct signal same problem.

My other thought is that the color space difference is the problem with the Atem utilizing YUV and the Kramer using RGB. However, the iMac (and my MacBook Pro which I tested and worked) use RGB and work perfectly.

So, any insights in how to successfully send the ProPresenter feed to both the projector and Atem 1?

Have seen these Kramer switches take over 3 mins to try and sync . If you don't need a HDMI switcher just use a HDMI DA to split the sources. Personally I have found Kramer HDMI /DVI stuff to be pretty unreliable not play nicely with other equipment, over the years and have seen many strange faults vanish when Kramer stuff is removed.

Yeah I've been on the phone with Kramer's tech support for two days. Those guys are amazing; very tech savvy and helpful. BMD phone support was basically not helpful at all...

I did run our JVC cam > VS-48 > Atem and the picture was perfect. So, the problem seems to be a combination of the Mac, VS-48, and Atem 1 combined. They aren't enjoying hanging out together...

I am attempting to acquire a TVOne HDMI switcher to test out or else a small DVI emulator to plug the Mac into directly to bypass HDCP.

I found a solution. The problem was HDCP. I realized that somehow when the iMac was plugged through the Kramer it was sending an HDCP handshake. When plugged direct to the Atem it was not. So, I got a Gefen HDMI EDID Detective, captured the EDID info from the Atem and plugged the iMac directly into the Gefen so it would see non-HDCP compliant EDID first and then the Kramer just passed that signal through and it worked!

Same with me. I can't get MBP hdmi through a kramer scaler. I just get snow.

Depending on your specific model you can disable HDCP. My 728 is able to do so.

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