Frank Engel wrote:If I am misunderstanding and the different processing path you are taking is causing the audio to get ahead of the video, a workaround while waiting for this might be to de-embed the audio close to the switcher and bring it into one of the analog inputs which does have a delay.
Another option would be to place an audio delay unit before the HDMI embedder.
Yes, you seem to have misunderstood. HDMI video output from a camera is always delayed. Audio from a mic / digital mixer console / audio interface usually is not. (unless ran through plugins that introduce latency). That's exactly why we have the option to add delay to mic inputs in the first place.
If a mic is plugged directly to a camera, the audio is delayed the correct amout inside the camera already so it's in sync when fed out from the camera's HDMI output.
Audio to HDMI embedder / inserter does not delay audio. It simply inserts the audio to the HDMI stream (replacing the audio fed to it's HDMI input alongside video), so video signal from HDMI cameras will always be delayed compared to directly fed audio.
We could of course use a separate digital to analog converter right before the Atem Mini, but that does not change the fact that unnecessary D/A + A/D convertions take place here, and again this introduces the possibility of grounding issues. There are ways around this of course, for example using a hum eliminator like Howard mentioned above. However these cost money and the other main point was to avoid audio quality degradation.
We use pro quality analog to digital converters, mix live music and audio with pro quality gear, that's then fed to Atem Mini's consumer quality mic inputs and A/D converters. This is by no means badmouthing the Atem Mini hardware. I fully understand that for this price range, and in addition to the already mind-blowing feature set we cannot have pro quality audio as well. Pro A/D converters alone cost a lot of money.
I'm just saying that there would be an easy (and cheap) way to get rid of any grounding issues and retain pristine audio quality bypassing the Atem Mini's mic inputs and audio conversion stage alltogether by using a digital to digital HDMI audio inserter. There is no conversion whatsoever taking place inside these audio embedders when fed with digital audio. Delaying the audio would be most gracefully handled within the Atem Minis, as they are already cabable of handling this task (currently on the mic inputs only) without the need of external audio delay units.
I mean one of these very affordable babies:
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