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I'm trying to attach timestamp metadata to the virtual loopback devices I've spun up. However, when I use the VIDIOC_QUERYCAP() ioctl (https://www.kernel.org/doc/html/v5.2/media/uapi/v4l/dev-meta.html), and look at the device_caps and capabilities fields, the bits for V4L2_CAP_META_OUTPUT and V4L2_CAP_META_CAPTURE (https://dri.freedesktop.org/docs/drm/media/uapi/v4l/vidioc-querycap.html#device-capabilities) are both off. Is there a way to create a virtual video loopback device that does support the metadata interface?

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no, v4l2loopback currently does not support metadata streams

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