+.SS Do I need any other programs?
+.PP
+youtube\-dl works fine on its own on most sites.
+However, if you want to convert video/audio, you\[aq]ll need
+avconv (https://libav.org/) or ffmpeg (https://www.ffmpeg.org/).
+On some sites \- most notably YouTube \- videos can be retrieved in a
+higher quality format without sound.
+youtube\-dl will detect whether avconv/ffmpeg is present and
+automatically pick the best option.
+.PP
+Videos or video formats streamed via RTMP protocol can only be
+downloaded when rtmpdump (https://rtmpdump.mplayerhq.hu/) is installed.
+Downloading MMS and RTSP videos requires either
+mplayer (http://mplayerhq.hu/) or mpv (https://mpv.io/) to be installed.