Add a MESSAGE to document that further tools can be needed for some sites

(but aren't strictly needed for most supported sites).

Thanks to coypu who pointed out that via a private email.

1 files changed, 10 insertions, 0 deletions

diff --git a/net/youtube-dl/MESSAGE b/net/youtube-dl/MESSAGE
new file mode 100644
index 00000000000..aa5d91a5a50
--- /dev/null
+++ b/net/youtube-dl/MESSAGE
@@ -0,0 +1,10 @@
+===========================================================================
+$NetBSD: MESSAGE,v 1.1 2016/03/11 18:39:05 leot Exp $
+
+youtube-dl works fine for most supported sites.
+
+For some extractors youtube-dl also needs
+multimedia/{ffmpeg,ffmpeg2,ffmpeg3}, 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.
+===========================================================================