[MPlayer-users] Problem with audio output

[inpreet]

Hello,

I am playing videos using Mplayer on framebuffer. 
Linux # mplayer -ao help

MPlayer 1.0pre7-3.2 (C) 2000-2005 MPlayer Team
CPU: SGI MIPS
Available audio output drivers:
        mpegpes Mpeg-PES audio output
        oss     OSS/ioctl audio output
        null    Null audio output
        pcm     RAW PCM/WAVE file writer audio output

Now when I am trying to play my video with following commands
Linux #  mplayer -vo fbdev -ao mpegpes demo_video.mpeg
It shows :
Could not open/initialize audio device -> no sound.
Audio: no sound
Starting playback...
-----------------------------------------------------------------
Linux # mplayer -vo fbdev -ao oss demo_video.mpeg
It shows:
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file or directory
Could not open/initialize audio device -> no sound.
Audio: no sound
Starting playback...
-----------------------------------------------------------------
Linux # mplayer -vo fbdev -ao pcm demo_video.mpeg
It plays video with no error message but video is very very slow and no sound. But there is no error message.

What should I do to rectify this problem?