alt Hacker NewsDVD supports an absolute amazing amount of features many of which were rarely if ever used, and some never implemented on most players, likely.
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paradox460 • today at 1:53 AM
What's even more amazing/sad is that Matroska containers support much of it, but no one has implemented a player that has all of them
It's why the original Matrix DVD dual layer release was so hard to duplicate / replicate by pirates/"enthusiasts" in a way that would fit on single layer DVDs. One of those was a secret "follow the white rabbit" mode that lead to hidden content.
doom9 had reams of guides dedicate to the matter: https://forum.doom9.org/showthread.php?p=313722