Library is not stable, because Youtube often changes web structure of its pages. I don't use this library regularly to find the errors. Thats why errors are fixed as ...
'PT' is a regular prefix string 'H' for 'Hour' 'M' for 'Minute' 'S' for 'Second' Maybe you notice that , not every duration string has all 3 letters , like the third example above , '11H1S' with no 'M ...
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