As you are telling it works on OBS, consider this checklist:
- Is Desktop Video software properly installed? Look for Desktop Video Setup and make sure the device is listed.
- Is the device already in use in OBS? Close all other programs and restart the machine if necessary.
- Does the channel video mode matches one supported by your device?
- Have you tried changing the keyer mode to default?
Those cards are very “special”, never seemed to work as advertised and gave me many headaches in the past.
Well I just noticed the log says:
Could not determine whether device supports requested video format: 720p50
Either the Desktop video software does not support the device properly or CasparCG doesn’t.