ploplinux 420 gnome mplayer play video only have audio output but no display

[sqkjwx]

ploplinux 420 gnome mplayer play video only have audio output but no display ,i put the codecs file in the right place(opt/codes)  ,it works under 412 version   ,maybe mplayer cannot find the codecs .   i check that  codecs was linked to /opt/lib/codecs .  i try to make a link to /usr/lib/codecs ,only failed with read-only syste.  i think /opt/lib was not under mplayer's codecs searching path. how can i fix it , please help me....

[Elmar]

the codecs directory is still /opt/lib/codecs. what codec is used?

[sqkjwx]

thankx for replay .code for normal video file such as avi, rm,rmvb and mkv.    i boot ploplinux via nfs with client pc .and the video file (some films) also locate in the server and share with nfs mount when login gnome.

[Elmar]

i tried various avi's without problem. i played the avis with no additional codec

[sqkjwx]

i tried various avi's without problem. i played the avis with no additional codec

i got something new ,  mplayer can play rmvb files without problem ,but cannot play avis  ,, i test it use terminal .  something like :
[mpeg4 @ 0x89445e0]Error, header damaged or not MPEG4 header (qscale=0)
[mpeg4 @ 0x89445e0]header damaged

spit out without video screen but sound.