hello mrvsitting Bull,
regarding your questions i can recommend both bm and yuan cards. if you want sdi input of 2or 4 sdi input yuan has a great price quality.

bm is a bit more picky but you get good support.

regarding camera s it will be difficult to find a good camera with sdi out, so i suggest using a good prosumer cam and an hdmi to sdi converter.

i would not recommend ip camera in a fixed setting, better to choose a good light sensitive camera and a hdmi sdi converter so you will have no latency at all. i recommend inputting audio through the camera as well so you will have both audio and video arrive through the sdi input.

greetings,
stefan

ps i use a canon xa25 as a typical lecture capture pro cam. a little out of your budget range but highly recommended. an alternative is a panasonic 900 range or a sony or canon in that price range of about 700-900 euros.

There are several points in the setup where you'll have a bit of a delay:
- 30 ms to 100 ms from the camera output
- 16 ms to 30 ms for converting between SDI and HDMI
- 60 ms or more for the video capture card
- 16 ms to 30 ms for vMix
- possibly some delay for the external output or fullscreen output from vMix

I find that in a live production environment, anything more than 150 ms of TOTAL delay causes the video delay to be noticeable when someone is talking. Maybe for a sign language conference this delay would not be a problem? I don't know...

I've tried several prosumer cameras, including the Canon XA20 (HDMI version of the XA25) and the Canon HFG30, but their output delay was too high for my usage. I ended up settling on the Sony HVR-V1U, which is 1080p30 rather than 1080p60 like the others I mentioned, but its delay is much better. Unfortunately, there isn't much information available for the output delay of various cameras, so you may have to just try them yourself if the differences in delay are a concern.

> Vmix t it has a function to control a camera to zoom, move?

No.
I use this kind of setup to do that work: http://expedition-electr.../pantilt/pantiltlanc.htm
The components are: Bescor MP-101 pan/tilt head, USB Pan Tilt Controller with Sony LANC interface, and a gamepad controller.

Yeah, it's not a problem if the audio is delivered with the video. But in some live situations, the sound is distributed without the vMix PC and therefore has almost no delay, in which case the video latency can be an issue. It completely depends on the usage scenario, but I thought I'd mention the sync issue because Sittingbull86 had asked about delay.