Bug

The WebcamCapture node has a capture_on_queue option (default: True) that's supposed to trigger a new capture every time a prompt is queued. But the IS_CHANGED method completely ignores this flag:

@classmethod
def IS_CHANGED(cls, image, width, height, capture_on_queue):
    return super().IS_CHANGED(image)  # capture_on_queue is never used!

super().IS_CHANGED(image) returns a SHA-256 hash of the image file. When capture_on_queue=True, if the webcam frame written to disk happens to match the previous one (or the file hasn't been updated yet), ComfyUI's caching layer sees the same hash and skips re-execution entirely. The node appears to "freeze" and doesn't process new frames.

Expected behavior

When capture_on_queue=True, IS_CHANGED should return float('NaN') so the node is always considered changed and re-executed on every queue. When capture_on_queue=False, the file hash check is correct — only re-run if the image actually changed.

Fix

@classmethod
def IS_CHANGED(cls, image, width, height, capture_on_queue):
    if capture_on_queue:
        return float("NaN")
    return super().IS_CHANGED(image)

This matches the pattern used elsewhere in the codebase (e.g. tests/execution/testing_nodes/testing-pack/specific_tests.py) where float('NaN') is returned to force unconditional re-execution.