It's nice that the BM TV Studio now has an audio mixer. The management of SDI/HDMI audio is a step forward. But how much analog audio delay is typical of this system? 1, 2, or more frames? It doesn't take much to spoil the show.
My guess is that it depends on how much work the TVS has to do to match various inputs. Is this a fair guess? I'm going to do some tests on my own, but if anyone has opinions, or data on the subject, I'd be grateful.
The delay is always 1 frame from input to output - no matter how much cameras you connect as long as the cameras are unsynced. If you sync all cameras to the TVS then you will have just 1 line of delay.
What you say about the audio is unfortunately not true. After the video signal is processed by the TVS and gets out of the SDI output you will experience a difference of 1 frame between audio and video. The audio will be 1 frame ahead of the video. That is why you should use a delay that delays the audio by one frame (in PAL 40ms in NTSC 33,3ms) before it gets into the TVS.
But even your camera can have a own delay from shooting the picture until the signal leaves the HDMI or SDI output. For example: Our HPX3600 has 2 frames of delay until the signal leaves the HD-SDI output. You would have to add that amount to the 1 frame of the TVS and end up at 3 frames of delay.
Many thanks for your clarification. I get it.
Your statement on camera delay is also most interesting.
It's not a factor I had considered before, but upon reflection it seems totally reasonable.
I'm working with Panasonics (AF100/AC160's), clearly some real world testing is in order.