I know this isn’t what you asked for but...

Could you find a suitable 60 minute countdown video (there are dozens fairly easy to find) and then just start it from where you need?

Drop your files into “Alley” to convert them to DXV.

You don’t need to specify anything. Just sending a suitable OSC string will replace whatever is currently in the text source. You can find the OSC syntax required by turning on OSC mapping then clicking in the text area, you’ll see the OSC address down in the help window. I used this to drive a coun...

You could probably do this using Touch Designer. It would manage the GET request, then re parse the text into a suitable OSC string (you can already dynamically alter text sources via OSC).

I can’t imagine this becoming an “off the shelf” fix or feature, but it’s a good geek quest!

Your video app of choice, with either an NDI or Syphon screen capture program picking it up. You’ll have to deal with the audio separately.

Better still to have the call on a separate machine, and use a hardware capture device.

Not possible in the sense you’re thinking of. But you can do a lot of creative “transitions” by using envelopes on opacity and transforms.

Basic zoom doesn’t use stream keys in that way. You may not need OBS at all, have a look for a bit of software called “camtwist”. This allows you to pick a syphon source (Resolume!) and then presents itself to the system like a webcam. Zoom can “see” camtwist” as a usable source. I hosted a family q...

DXV files are indeed huge. That’s the small sacrifice for the stability and speed.

Look up “envelopes” in the manual and then have a play. Not precisely the same but a very powerful tool.

I’m guessing Arvol will say Touch Designer? I’ve started using a combination of that and Companion. Companion being the initial trigger (simple messages). Touch designer listening to companion and then sending multiple messages as needed.