Colleagues had problems hooking a MacBook Pro Retina, 13 Inch connecting to Room 220 Codec via HDMI presentation intput - got no display. Any ideas or suggestions on how to overcome this?
How were you connecting? Directly from a built-in HDMI port on the MacBook, or from a DisplayPort dongle of some sort? What we have seen is that some computers (both Mac and Windows) have issues with HDCP (High-bandwidth Digital Content Protection) and more likely that we see it when using HDMI or DVI connections. HDCP is designed to prevent copying of things like BluRay and other HD video sources but is built in to many PCs as they are used to play back HD content.
We don't support HDCP in our codecs (we couldn't; because we interoperate with other vendors we can't guarantee that whatever is at the far end of a video call isn't recording the content in HD and that's a requirement you have to meet to support HDCP). What is supposed to happen is under those circumstances that the source (the MacBook) should send video ok, so long as it's not flagged as copy-protected, which your normal screen output isn't of course (normally) unless it's playing some purchased HD video.
However, what we have seen is that some systems with HDCP don't make that distinction and just don't output video.
All of that is a rather long winded (sorry) way of saying that if you're using HDMI or DVI or DisplayPort, you could (if you have one already) try a DP to VGA dongle for example and connect that from the MacBook to the codec and see if that works. Remember to set the screen to 1280x720 or 1280x768 at 60Hz to be sure it's running at a supported resolution.
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