alright.. i've uploaded a MPlayer 1.0pre5 tardist: http://www.kanera.de/irix/test/MPlayer-1.0pre5.tardist
the two most interesting facts first:
- contains dexters impressive MIPS optimizations to libavcodec idct, significantly increasing codec performance of the most common codecs (mpeg1/2/4, sorenson svq3..
see viewtopic.php?t=2976 for the whole story

- contains vegacs vo_sgi video out plugin providing several different rendering paths for the optimal display on most SGIs. It runs single or multi threaded depending on the number of CPUs it finds. It has defaults set for the most common machines (O2 CRM, Indigo2/Octane Impact, Octane/Fuel/Tezro VPro) but can be configured very flexibly see the included /opt/mplayer/etc/mplayer/mplayer.conf for the gory details

This is all work in progress - so please keep those critics, praises, suggestions coming!
If you happen to have a machine vo_sgi has not yet defaults for (RE, IR.. Ultimate Vision?) please go through the different settings and let vegac know what defaults would fit best
some less spectacular facts:
- compiled with MipsPro 7.4.2m and heavy optimizations (see the release notes for the $CFLAGS)
- contains mips4 and mips3 distributions
- all external libs are linked statically, hence there are no prereqs
- tested on IRIX 6.5.20 to make sure it isn't dependent on the libc changes after 6.5.21
- installs to /opt/mplayer
- enabled features:
Input: ftp network edl tv live.com matroska(internal) dvdread
Codecs: xvid libavcodec real faad2(external) libmpeg2 liba52 mp3lib libvorbis libmad gif
Audio output: sgi nas sdl mpegpes(file)
Video output: sdl gif89a jpeg mpegpes(file) opengl x11 xover tga
- opt subsystem contains the release notes, original source code, distribution files and patches
- includes an mplayer.conf default config file with many irix related comments
one remaining note: if you have a ~/.mplayer/config file overriding the default mplayer.conf and you want to use vo_sgi, make sure you don't have any -fv format=rgb24 lines in there (unless you want to force external software colorspace conversions).
that should sum it up, check the release notes and the mplayer.conf for more detailed information..
Have fun!
Timo