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Maybe you just haven't installed the needed codecs, for example divx, mpeg2 or others. I know this problem just because of missing codecs.
But try to find out more by having a look at the log-file, I think mplayer will write on....
when i try to play DVD,i act like this and no vedio
# mplayer -dvd 1 -alang en -slang hu -dvd-device /dev/hdc
Using GNU internationalization
Original domain: messages
Original dirname: /usr/share/locale
Current domain: mplayer
Current dirname: /usr/local/share/locale
MPlayer 0.90rc5-3.2.2 (C) 2000-2003 Arpad Gereoffy (see DOCS)
CPU: Advanced Micro Devices Duron MG Morgan (Family: 6, Stepping: 0)
Detected cache-line size is 64 bytes
CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE
Reading config file /usr/local/etc/mplayer/mplayer.conf: No such file or directory
Reading config file /root/.mplayer/config
Reading /root/.mplayer/codecs.conf: can't open '/root/.mplayer/codecs.conf': No
such file or directory
Reading /usr/local/etc/mplayer/codecs.conf: 50 audio & 136 video codecs
Font /root/.mplayer/font/font.desc loaded successfully! (233 chars)
Using Linux hardware RTC timing (1024Hz).
Can't open input config file /root/.mplayer/input.conf : No such file or directory
Can't open input config file /usr/local/etc/mplayer/input.conf : No such file or directory
Falling back on default (hardcoded) input config
Playing DVD title 1
Reading disc structure, please wait...
There are 1 titles on this DVD.
There are 37 chapters in this DVD title.
There are 1 angles in this DVD title.
DVD successfully opened.
Selected DVD audio channel: 128 language: en
No matching DVD subtitle language found!
MPEG-PS file format detected.
VIDEO: MPEG2 720x480 (aspect 3) 29.97 fps 6218.0 kbps (777.2 kbyte/s)
Opening audio decoder: [liba52] AC3 decoding with liba52
Using SSE optimized IMDCT transform
AC3: 5.1 (3f+2r+lfe) 48000 Hz 448.0 kbit/s
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, 16 bit (0x10), ratio: 56000->192000 (448.0 kbit)
Selected audio codec: [a52] afm:liba52 (AC3-liba52)
fbdev: Can't open /dev/fb0: No such device
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 480 (preferred csp: Mpeg PES)
VDec: using Mpeg PES as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO: [null] 720x480 => 854x480 Mpeg PES
Selected video codec: [mpegpes] vfm:mpegpes (Mpeg PES output (.mpg or Dxr3/DVB card))
Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/16bit...
AF_pre: af format: 2 bps, 2 ch, 48000 hz, little endian signed int
AF_pre: 48000Hz 2ch Signed 16-bit (Little-Endian)
AO: [oss] 48000Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/16bit...
A: 11.6 V: 11.6 A-V: 0.016 ct: 0.044 341/341 0% 0% 3.8% 0 0 0%
ok, it says you're trying to use fbdev, which (by divine inspriartion) tells me that you don't have the XFree86-devel package installed on your system. if you did then MPlayer would have access to the XWindows based output's which is what you are expecting. install that package, reconfigure, and make and install again. check the output of configure and you should see somethign like
Checking for X11.......... yes
currently that will be saying no due to that package not being found.
fbdev: Can't open /dev/fb0: No such device
i just happen to know that that is the last resort when it can't find any other video output to use. you can also see later on that it says "vo [null]" so it's actually given up trying to show the video by that stage.