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The video can be downloaded with rtmp or http, but the best quality format seems to always use rtmp.
Deleted the old methods.

When writing to a file it would fail.

It was being called as "error"

Added option for vtt WebVTT subtitle format for Youtube

Now automatic subtitles are only downloaded if the option is given.
(closes #903)

Used only for accessing a private video

Restore the error when the account is missing

Added embedded youtube detection to WorldstarIE