whats so special about mplayer. Use vlc much better than it. Also you need gstreamer codec pack to play all audio/video files through default ubuntu media player. Here are the download links for vlc & gstrteamer
vlc:
*packages.medibuntu.org/pool/free/f/ffmpeg/libavutil1d_0.cvs20070307-5ubuntu7+medibuntu1_i386.deb
*packages.medibuntu.org/pool/free/f/ffmpeg/libavcodec1d_0.cvs20070307-5ubuntu7+medibuntu1_i386.deb
*packages.medibuntu.org/pool/free/f/ffmpeg/libavformat1d_0.cvs20070307-5ubuntu7+medibuntu1_i386.deb
*packages.medibuntu.org/pool/free/f/ffmpeg/libpostproc1d_0.cvs20070307-5ubuntu7+medibuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/a/a52dec/liba52-0.7.4_0.7.4-11ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/f/faac/libfaac0_1.26-0.1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libg/libgsm/libgsm1_1.0.12-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/l/lame/liblame0_3.97-0.0_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/x/x264/libx264-57_0.svn20071224-0.0ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/x/xvidcore/libxvidcore4_1.1.2-0.1ubuntu3_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libd/libdc1394/libdc1394-13_1.1.0-5ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libd/libdvbpsi4/libdvbpsi4_0.1.5-3_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libd/libdvdnav/libdvdnav4_0.1.10-0.2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libd/libdvdread/libdvdread3_0.9.7-8ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libe/libebml/libebml0_0.7.7-3.1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libf/libfreebob/libfreebob0_1.0.7-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libi/libid3tag/libid3tag0_0.15.1b-10_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libc/libcdio/libiso9660-5_0.78.2+dfsg1-2ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...ection-kit/libjack0_0.109.2-1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libm/libmad/libmad0_0.15.1b-2.1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libm/libmatroska/libmatroska0_0.8.1-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libm/libmodplug/libmodplug0c2_0.7-7_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libm/libmpcdec/libmpcdec3_1.2.2-1build1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/m/mpeg2dec/libmpeg2-4_0.4.1-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/s/sdl-image1.2/libsdl-image1.2_1.2.6-3_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libt/libtar/libtar_1.2.11-4_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/v/vcdimager/libvcdinfo0_0.7.23-4ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/mul...e+x264svn20071224+faad2.6.1-0ubuntu3_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/w/wxwidgets2.6/libwxbase2.6-0_2.6.3.2.2-2ubuntu4_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/w/wxwidgets2.6/libwxgtk2.6-0_2.6.3.2.2-2ubuntu4_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/x/xosd/libxosd2_2.2.14-1.4_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/t/ttf-dejavu/ttf-dejavu-extra_2.23-1_all.deb
*archive.ubuntu.com/ubuntu/pool/main/t/ttf-dejavu/ttf-dejavu_2.23-1_all.deb
*archive.ubuntu.com/ubuntu/pool/mul...e+x264svn20071224+faad2.6.1-0ubuntu3_i386.deb
*archive.ubuntu.com/ubuntu/pool/mul...e+x264svn20071224+faad2.6.1-0ubuntu3_i386.deb
*archive.ubuntu.com/ubuntu/pool/mul...e+x264svn20071224+faad2.6.1-0ubuntu3_i386.deb
gstreamer:
*archive.ubuntu.com/ubuntu/pool/main/f/ffmpeg/libavutil1d_0.cvs20070307-5ubuntu7_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libg/libgsm/libgsm1_1.0.12-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/f/ffmpeg/libavcodec1d_0.cvs20070307-5ubuntu7_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libd/libdc1394/libdc1394-13_1.1.0-5ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/f/ffmpeg/libavformat1d_0.cvs20070307-5ubuntu7_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/f/ffmpeg/libpostproc1d_0.cvs20070307-5ubuntu7_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...ffmpeg/gstreamer0.10-ffmpeg_0.10.3-6_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...amer0.10-fluendo-mp3_0.10.7.debian-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...amer0.10-fluendo-mpegdemux_0.10.15-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...er0.10-pitfdll_0.9.1.1+cvs20080215-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libc/libcdaudio/libcdaudio1_0.99.12p2-3_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/f/faad2/libfaad0_2.6.1-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/m/mysql-dfsg-5.0/mysql-common_5.0.51a-3ubuntu5_all.deb
*archive.ubuntu.com/ubuntu/pool/main/m/mysql-dfsg-5.0/libmysqlclient15off_5.0.51a-3ubuntu5_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/g/gmyth/libgmyth0_0.7.debian1-1~hardy1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libi/libiptcdata/libiptcdata0_1.0.2-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libf/libfreebob/libfreebob0_1.0.7-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...ection-kit/libjack0_0.109.2-1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libm/libmms/libmms0_0.3-6_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libm/libmpcdec/libmpcdec3_1.2.2-1build1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libo/libopenspc/libopenspc0_0.3.99a-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/s/soundtouch/libsoundtouch1c2_1.3.0-2.2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/w/wildmidi/libwildmidi0_0.2.2-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni...0/gstreamer0.10-plugins-bad_0.10.6-5_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/f/faac/libfaac0_1.26-0.1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libq/libquicktime/libquicktime1_1.0.0+debian-5_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/m/mjpegtools/libmjpegtools0c2a_1.8.0-0.2ubuntu5_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/x/x264/libx264-57_0.svn20071224-0.0ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/x/xvidcore/libxvidcore4_1.1.2-0.1ubuntu3_i386.deb
*archive.ubuntu.com/ubuntu/pool/mul...0.10-plugins-bad-multiverse_0.10.6-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libj/libjingle0.3/libjinglebase0.3-0_0.3.11-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libj/libjingle0.3/libjinglexmllite0.3-0_0.3.11-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libj/libjingle0.3/libjinglexmpp0.3-0_0.3.11-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libj/libjingle0.3/libjinglep2p0.3-0_0.3.11-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni....10-plugins-farsight_0.12.5-2ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/a/a52dec/liba52-0.7.4_0.7.4-11ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libd/libdvdread/libdvdread3_0.9.7-8ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libi/libid3tag/libid3tag0_0.15.1b-10_i386.deb
*archive.ubuntu.com/ubuntu/pool/main/libm/libmad/libmad0_0.15.1b-2.1ubuntu1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/m/mpeg2dec/libmpeg2-4_0.4.1-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/libs/libsidplay/libsidplay1_1.36.59-4_i386.deb
*archive.ubuntu.com/ubuntu/pool/uni.../gstreamer0.10-plugins-ugly_0.10.7-3_i386.deb
*archive.ubuntu.com/ubuntu/pool/multiverse/l/lame/liblame0_3.97-0.0_i386.deb
*archive.ubuntu.com/ubuntu/pool/mul....10-plugins-ugly-multiverse_0.10.7-1_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/s/schroedinger/libschroedinger-1.0-0_1.0.1-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/s/schroedinger/gstreamer0.10-schroedinger_1.0.1-2_i386.deb
*archive.ubuntu.com/ubuntu/pool/universe/g/gst-plugins-bad0.10/gstreamer0.10-sdl_0.10.6-5_i386.deb
*security.ubuntu.com/ubuntu/pool/ma.../gstreamer0.10-esd_0.10.7-3ubuntu0.1_i386.deb
Instructions to install:
put all the downloaded files into a folder say vlc( all vlc files)
move this folder to your home folder (just cut/copy and paste)
launch the terminal from application -> accessories -> Terminal and issue following commands
cd vlc (to change the directory to vlc)
sudo dpkg -i *.deb (this is to install all the packages with singal command)
use same steps to install gstreamer
Now listen to your Ubuntu