[MPlayer-DOCS] document o (avopts) suboption

[compn]

here is a preliminary patch for documenting this.

where is the list of AVOptions? i cant find it.

should add the word 'demuxer/muxer' to the entries?
one of the examples is incorrect as i cant find the avopts

also i think there are a few more o options i need to document
there are 4, right? decoder,encoder,demuxer,muxer?

Index: mplayer.1
===================================================================
--- mplayer.1   (revision 27471)
+++ mplayer.1   (working copy)
@@ -7633,6 +7633,8 @@
 Pass AVOptions to libavcodec
 Note, a patch to make the o= unneeded and pass all unknown options
through the AVOption system is welcome.
+A full list of AVOptions can be found in FFmpeg manual.
+Note that some options may conflict with MEncoder options.
 .sp 1
 .RS
 .I EXAMPLE:
@@ -10472,9 +10474,23 @@
 .B format=<value>
 Force a specific libavformat demuxer.
 .
+.
 .TP
-.B "o\ \ \ \ \ \ "
-FIXME: undocumented
+.B o=<key>=<value>[,<key>=<value>[,...]]
+Pass AVOptions to libavformat
+Note, a patch to make the o= unneeded and pass all unknown options
through +the AVOption system is welcome.
+A full list of AVOptions can be found in FFmpeg manual.
+Note that some options may conflict with MPlayer/MEncoder options.
+.sp 1
+.RS
+.I EXAMPLE:
+.RE
+.RSs
+.PD 0
+.IPs o=bt=100k
+.PD 1
+.RE
 .
 .TP
 .B probesize=<value>
@@ -10541,8 +10557,21 @@
 Sometimes raising it is necessary in order to avoid "buffer
underflows". .
 .TP
-.B "o\ \ \ \ \ \ "
-FIXME: undocumented
+.B o=<key>=<value>[,<key>=<value>[,...]]
+Pass AVOptions to libavformat
+Note, a patch to make the o= unneeded and pass all unknown options
through +the AVOption system is welcome.
+A full list of AVOptions can be found in FFmpeg manual.
+Note that some options may conflict with MEncoder options.
+.sp 1
+.RS
+.I EXAMPLE:
+.RE
+.RSs
+.PD 0
+.IPs o=bt=100k
+.PD 1
+.RE
 .
 .TP
 .B packetsize=<size>