Prior to purchasing the iMac, we were using an HP Z400 with Decklink SDI card or USB3.0, neither of which had this issue. We've noticed that, while the audio sync on the YouTube livestream (Teradek Vidiu) and the Broadcast Room Monitor (which we use to manually dial audio sync in) both match up perfectly, but the iMac local recording has additional audio delay that we have to adjust when editing the video. Teradek Vidiu Streaming Box: ATEM HDMI output straight to Vidiu HDMI input.Local Recording iMac: ATEM HD-SDI Aux 3 Output to 27" 2017 iMac via BMD Ultrastudio Mini Recorder (requires an additional Thunderbolt 2 to 3 converter).Broadcast Room monitor: ATEM HD-SDI Program Output to HDMI display monitor via BMD HD-SDI/HDMI micro converter.We have an ATEM 1 M/E (HD version) going to multiple locations:
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