I've noticed the same problem on edgy (mplayer package version 2:0.99+1.0pre8-0ubuntu8) and tried to examine it a bit:
Problem exists only when mplayer is started with gui (as gmplayer) the tail of the output in terminal looks like this:
----begin quotation----
AVI file format detected.
VIDEO: [divx] 480x320 24bpp 30.000 fps 918.5 kbps (112.1 kbyte/s)
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
open: No such file or directory
vo_mga: Couldn't open /dev/mga_vid
----end quotation----
and the window with message about error in opening video_out (-vo) device appears.
However when started without gui (as mplayer) the problem does not exist.
I've tried to downgrade to version 2:0.99+1.0pre7try2+cvs20060117-0ubuntu8 which used to work on dapper, but unexpectedly problem still appeared! It also appeared when I tried by my self compiled version 1.0rc1 downloaded from mplayerhq.hu. So I suspect that this is something wrong with edgy environment, not with mplayer it self, that makes it not work properly when started with gui.
I've noticed the same problem on edgy (mplayer package version 2:0.99+ 1.0pre8- 0ubuntu8) and tried to examine it a bit:
Problem exists only when mplayer is started with gui (as gmplayer) the tail of the output in terminal looks like this:
----begin quotation---- ======= ======= ======= ======= ======= ======= ======= ======= ======= ==== ======= ======= ======= ======= ======= ======= ======= ======= ======= ====
AVI file format detected.
VIDEO: [divx] 480x320 24bpp 30.000 fps 918.5 kbps (112.1 kbyte/s)
=======
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
=======
open: No such file or directory
vo_mga: Couldn't open /dev/mga_vid
----end quotation----
and the window with message about error in opening video_out (-vo) device appears.
However when started without gui (as mplayer) the problem does not exist.
I've tried to downgrade to version 2:0.99+ 1.0pre7try2+ cvs20060117- 0ubuntu8 which used to work on dapper, but unexpectedly problem still appeared! It also appeared when I tried by my self compiled version 1.0rc1 downloaded from mplayerhq.hu. So I suspect that this is something wrong with edgy environment, not with mplayer it self, that makes it not work properly when started with gui.