Hi Michael

Alternatively you can do this with vMix UTC, even without 4K or Pro licence. Since a few months UTC handles "conditions" for command execution. I believe it's possible to analyse when 2 audio inputs are active at the same time in order to switch to CAM3 and it's also possible to use a delay before execution in order to prevent from inappropriate switching (such as a cough, a laugh or just an occasional noise coming from one of the audio inputs)

Another solution I can think of for this use case I saw on FB is to use Triggers on inputs. Triggers can call a script on conditions. If the script only does the case analysis for action to take, this solves your issue of querying the status.

I never tried this, as it's the opposite of what I use vMix for -being a director, I don't want vMix to do my job - but these are 2 solutions I would work on if I had to do it.

Keep us posted
Guillaume

PS : I think it'd be easier to consider CAM3 (wide angle) as the default, and only switch to individual shots when sure only 1 audio is active... My 2 cts...

Select shot based on audio makes a certain amount of sense to me. It might be used to follow action around a course/track.

Emulating a video conference system seems a little misguided. I'd prefer to just use a VC system, and bring it into vMix as a source. of course, my background include lots of telecom/VC as well as broadcast.

if you send a http://127.0.0.1:8088/api/? vMix will a return with the some of the following.

Version of vMix
Edition of VMix
Which input is loaded and Status and Information of Input
Which Overlay is loaded and Status and Information of Input
Which input is set to Preview and Status and Information of Input
Which input is set to Output and Status and Information of Input
Audio levels ...
etc...

eg.

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<vmix>
<version>21.0.0.45</version>
<edition>Basic HD</edition>
<inputs>
<input key="8065cdca-d64b-4813-a75f-122e6f27d164" number="1" type="Xaml" title="NewsHD2.xaml" state="Paused" position="0" duration="0" loop="False" selectedIndex="0">
NewsHD2.xaml
<text index="0" name="Headline">HEADLINE</text>
<text index="1" name="Description">DESCRIPTION</text>
<text index="2" name="TitleTime">{0:hh:mm tt}</text>
<image index="0" name="BackgroundImage">
file:///C:/Program Files (x86)/vMix/titles/NewsHD2.xaml.png
</image>
</input>
<input key="fb3e17a7-a077-4ef9-8efa-06277a13c1e2" number="2" type="Blank" title="Blank" state="Paused" position="0" duration="0" loop="False">Blank</input>
</inputs>
<overlays>
<overlay number="1"/>
<overlay number="2"/>
<overlay number="3"/>
<overlay number="4"/>
<overlay number="5"/>
<overlay number="6"/>
</overlays>
<preview>2</preview>
<active>1</active>
<fadeToBlack>False</fadeToBlack>
<transitions>
<transition number="1" effect="Fade" duration="500"/>
<transition number="2" effect="Merge" duration="1000"/>
<transition number="3" effect="Wipe" duration="1000"/>
<transition number="4" effect="Stinger2" duration="1000"/>
</transitions>
<recording>False</recording>
<external>False</external>
<streaming>False</streaming>
<playList>False</playList>
<multiCorder>False</multiCorder>
<fullscreen>False</fullscreen>
<audio>
<master volume="100" muted="False" meterF1="0" meterF2="0" headphonesVolume="100"/>
<busA volume="100" muted="True" meterF1="0" meterF2="0"/>
<busB volume="100" muted="False" meterF1="0" meterF2="0"/>
</audio>
</vmix>

So yes, it would be possible to write a VB.NET to parse the information returned from the HTTP API. and send API commands to vMix in return.. There might be another way to do it directly in the vMixAPI.dll, vMixTitleLibrary.dll, vMixInterop.dll and other .dll's also..

I was just starting to learn Visual Studio and the various languages after a 30 year break from programming, but due to my new job driving trucks and being on the road 6 days a week, I no longer have time to try and write applications