Crash with a particular VideoCaptureDS Opts parameter

[Terry Payman]

EDIT: This is almost certainly a Magewell driver problem. OBS also crashes when attempting to access "Configure Video".

System repeatably crashes when VideoCaptureDS Opts parameter set to -show_video_device_dialog true

Other "Opts" settings work eg
-framerate 30
-framerate 59.94

Invalid settings disappear, eg -framerate 60 is replaced by the previous -framerate 59.94

App: Magic Performer 2.33 64-bit
OS: Windows 11 Professional (x64) Version 24H2 (build 26100.4652)
GPU: NVIDIA GeForce RTX 5060 Ti 16GB
Capture card: Magewell Magewell Pro Capture AIO
NVIDIA driver(latest): NVIDIA Studio Driver 5.77 July 22 2025.
Magewell Driver (latest) V1.3.0.4323 2022/12/28

CPU: 3.80 gigahertz AMD Ryzen 7 9700X with AMD Radeon graphics
Mobo: ASRock B850M Steel Legend WiFi
RAM: 32GB RAM

[Sadler]

Looks like you got a new laptop! That parameter works for me with my built-in webcam.

Screenshot 2025-07-26 173756.jpg (35.22 KiB) Viewed 3193 times

[Terry Payman]

Thanks for checking this Sadler!

It could be a problem with the capture card I'm using, or its driver, that wouldn't show with a different video source.

This is actually running on my new small desktop PC. I wanted something where I can upgrade the graphics.

It's going for its first outing at a local festival this weekend.
I need four large crates to carry all the kit I need for this one, plus a large bag for the projector and my PTZ camera.
One extra bag for the PC system vs a laptop doesn't add much. It's a car full either way.

[Terry Payman]

Magewell problem confirmed.
OBS also crashes when trying to "Configure Video"