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The URL https://www.youtube.com/watch?v=vHX33WbLrVE&feature=youtu.be could be shortened to https://www.youtube.com/watch?v=vHX33WbLrVE
Actually the short URL (supported by Google) is "https://youtu.be/vHX33WbLrVE" according to instructions provided on the site when "sharing" a video as an URL which can be cited in other websites.
The &feature=youtu.be
parameter in the long URL has no use: it is transient, may possibly change if Google restructures the features in Youtube, and it is already dropped when redirecting to the final full URL (using /watch?v=
).