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$NetBSD: MESSAGE,v 1.2 2018/05/06 10:22:59 leot Exp $

youtube-dl works fine for most supported sites.

For some extractors youtube-dl also needs multimedia/ffmpeg[234],
net/rtmpdump and multimedia/mplayer or multimedia/mpv.
All these packages are not automatically installed and it is needed to
manually install them if required.
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