I’ve got a MediaCapture setup that, for reasoning I’m still sussing out, only records one second of video without giving me any sort of discernible error or exception.

This only happens if I’m pulling audio and video from the same device, such as an HDMI-to-USB capture device, and even then only on some devices: one device might fail as explained, but another device of the same model won’t.
What could be going wrong within UWP, if anything? Which components ought I look deeper into to find the problem?
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