This text file contains information about a problem described in the MPlayer-users mailing list:

http://archives.free.net.ph/message/20060226.033655.1f004c4f.en.html

The uploaded files are:

"test_01.mkv" -> Contains internal subtitles.
"test_02.ass" -> External subtitle file (this file will help to show the correct behavior when pressing "b")
"test_02.mkv" -> Same file as "test_01.mkv" but without internal subtitles.

The problem is related to the "subtitle cycling" process in MPlayer. When 
you press the "b" key, MPlayer should cycle between the available subtitles.

If the available subtitles are external, then pressing "b" will work 
correctly:

* sub 01 -> sub off -> sub 01 -> sub off -> sub 01... (test_02.mkv and test_02.ass files)

If the available subtitles are internal (OGM or MKV), then pressing "b" will 
not work correctly:

* sub 01 -> sub 01 -> sub 01 -> sub 01 -> sub 01... (test_01.mkv file)

Note: Reverting from mplayer.c,1.900 to mplayer.c,1899 solves the problem 
(CVS log 01 in the mail report).