Question #247114 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/247114
Status: Open => Answered
RaiMan proposed the following answer:
Does "external video source" mean, that there is a video stream, that is
not made visible on the screen?
Sikuli currently can only search for images, that are visible on the
screen.
Even if they are visible, then it might be impossible with the currently used
technique to identify certain image objects, especially fast moving or changing
things, since Sikuli will capture the screen or a region on the screen at
random times, not synchronised with the frames of the video.
Rather static (at least for some time of at least one second) images should
work depending on how exact the probe fits to the image in the video.
Principally it would be possible, to implement the Sikuli features on video
streams, since the internally used OpenCV has extended video support, so one
could access and analyse the frames.
... but yes, much effort and currently not on the list.
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