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The same physical device can export multiple devices. In this case, the capabilities field now contains a union of all caps available from all exported V4L2 devices alongside a V4L2_CAP_DEVICE_CAPS flag that should be used to decide what capabilities to consider. In our case, we need the ones from the exported device we are using. https://bugzilla.gnome.org/show_bug.cgi?id=768195
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