I don't know what is wrong, but my mplayer works
$ mplayer /home/daniel/Videos/star-trek.avi
MPlayer SVN-r30040-4.4.1 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing /home/daniel/Videos/star-trek.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO: [XVID] 656x272 24bpp 25.000 fps 1150.3 kbps (140.4 kbyte/s)
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Opening audio decoder: [liba52] AC3 decoding with liba52
Using SSE optimized IMDCT transform
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [a52] afm: liba52 (AC3-liba52)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
Movie-Aspect is 2.41:1 - prescaling to correct movie aspect.
VO: [xv] 656x272 => 656x272 Planar YV12 [zoom]
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
and mediainfo says to the file
General
Complete name : /home/daniel/Videos/star-trek.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 1.31 GiB
Duration : 2h 1mn
Overall bit rate : 1 544 Kbps
Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings, BVOP : Yes
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 2h 1mn
Bit rate : 1 150 Kbps
Width : 656 pixels
Height : 272 pixels
Display aspect ratio : 2.40:1
Frame rate : 25.000 fps
Resolution : 8 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.258
Stream size : 1 002 MiB (75%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)
Audio
ID : 1
Format : AC-3
Format/Info : Audio Coding 3
Codec ID : 2000
Duration : 2h 1mn
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 48.0 KHz
Stream size : 334 MiB (25%)
Alignment : Aligned on interleaves
Interleave, duration : 40 ms (1.00 video frame)
Open synaptic and search for "codecs"
I've installed, see image
[attachment deleted by admin]