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dunno exactly what that would mean, i get that when i'm playing totally screwed up files. maybe you're not decrypting files properly or haven't installed it properly. I'd think that any questions from this stage would really best be aimed at the mplayer lists, there's vastly more info there.
I found this on the mplayer webiste which may be off help to you.
2.3.2. Audio output devices
MPlayer's audio interface is called libao2. It currently contains these drivers:
OSS (ioctl) driver
SDL driver (supports up/downsampling, ESD, ARTS etc)
NAS (Network Audio System) driver
native ALSA 0.5 driver
native ALSA 0.9 driver (works, but has problems -> use OSS)
SUN audio driver (/dev/audio) for BSD and Solaris8 users
Fact is, Linux sound card drivers have compatibility problems. It may take a while to find your optimal settings.
If you have an OSS driver, first try -ao oss (this is the default). If you experience glitches, halts or anything out of the ordinary, try -ao sdl
(NOTE: you need to have SDL libraries and header files installed). The SDL audio driver helps in a lot of cases and also supports ESD, ARTS,
and up/downsampling. (ESD is the sound daemon from GNOME, ARTS is from KDE.) If you have ALSA version 0.5, then you almost always have to use -ao alsa5 , since ALSA 0.5 has buggy OSS emulation code, and will crash
MPlayer with a message like this:
DEMUXER: Too many (945 in 8390980 bytes) video packets in the buffer!
If you have ALSA version 0.9 you may choose between -ao oss and -ao sdl. You can also use -ao alsa9. It works, but there are problems like
lost sync and disappearing audio.
On Solaris/FreeBSD systems, use the SUN audio driver with the -ao sun option, otherwise neither video nor audio will work.