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Too everybody that is doesn't work for, move it to a directory with no spaces. Also remember to update youtube-dl.

half of the videos I pick start, the others don't

What are you doing when this happens, also what video are you trying to watch?

a few, here's one! 

just playing normally, didn't work!

I see that it doesn't download the audio file for it. (the video doesn't have to have audio.). I don't know the problem behind  it, but it doesn't see work for me either.

Moving actually does not work. You must download it from the website initially.

Well for me it did, though I have a space in my username. :)