@erik said:
it's still a good idea to add these resolutions to the "Capture Camera To Movie" actor
 Entering it into our feature request database right now. Glad you found a workable solution.
Try
P1:2X P2:2X P3:2X
For me I am now getting a '0' in the output. (note I sent a 1,0, and 3, and these are converted to first ascii, then to hex.. so '1' = 0x31 )

This is hexadecimal, and here's what it translates to:
| Byte (Hex) | ASCII Character | Value Sent | 
|---|---|---|
31 | '1' | Param 1 = 1 | 
30 | '0' | Param 2 = 0 | 
33 | '3' | Param 3 = 3 | 
So there is a good chance this will work for you. (fingers crossed) I don't know what your receiver is looking for exactly.
Thanks everyone! Problem solved !
We've already found and tested this solution as an alternative. It's a little slower than our older versions (2.6), but it does the job! However, it's still a good idea to add these resolutions to the "Capture Camera To Movie" actor. Thank you for your cooperation.
Do you have access to how this is being interpreted on the other end?
@woland said:
Use the Capture Stage to Movie actor
 I was just going to add a work around using this actor. As others have said, you can create virtual stages, and record the stage output (at whatever size the stage is). With 8 cameras, you will need 8 virtual stages (you can have 64 I think). Just name them clearly, and use the Capture Stage to Movie actor to record each at the size you require. 
Hopefully its not too much of a work around. The flexibility and power provided by virtual stages is pretty great.
Note: take a look at 'Get Stage Image' as well. This allows you to loop back the video feed, so you could use a video in watcher, to a projector (sending to a virtual stage), then the Get Stage Image actor to continue the video stream as you had it before. This gives you access to the virtual stages for recording, without changing much more of the patch.
Do you need to capture audio with these videos?
If not, as @jfg said:
- In Stage Setup, create a Virtual Stage and manually set it to the capture resolution you want.
 - In Output > Record Stage Settings, make sure the resolution is the one you want to capture at.
 - In the Scene Editor, connect a Video In Watcher actor to a Projector actor
 - Set the 'stage' input of the Projector actor to target the Virtual Stage
 - Use the Capture Stage to Movie actor to start and stop video capture of the Virtual Stage.
 
one workaround would be to use ‘Video in Watcher’ to send the video input to, for example, stage 48 (the last possible stage) then use ‘Capture stage to movie’ by selecting, as @dbini writes, the desired format in ‘record stage settings’. It's not ideal but it works.
Best regards,
Jean-François
Did you have any other thoughts or suggestions?
I can now see a zero value output but I can't get any other value outputted now. Now it is ONLY zeros.
sorry but this panel control is to recording the stage, not from the source of webcam with "Capture Camera To Movie"
@erik
the resolution of movies recorded in Isadora is set by the Record Stage Settings menu in the Output dropdown.