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The mpeg players included with media-libs/smpeg segfault upon startup.

I suppose I should be a bit more specific:
glmovie and plaympeg are the apps I've tested.  They all segfault immediately 
on startup.  I'm running a fresh r14 install.

can you do an strace on them and see where they're segfaulting?

STRACE OF PLAYMPEG:

execve("/usr/bin/plaympeg", ["plaympeg"], [/* 30 vars */]) = 0
brk(0)                                  = 0x804cddc
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x40016000
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or 
directory)
open("/usr/lib/i686/mmx/libsmpeg-0.4.so.0", O_RDONLY) = -1 ENOENT (No such 
file or directory)
stat64("/usr/lib/i686/mmx", 0xbfffefd4) = -1 ENOENT (No such file or 
directory)
open("/usr/lib/i686/libsmpeg-0.4.so.0", O_RDONLY) = -1 ENOENT (No such file 
or directory)
stat64("/usr/lib/i686", 0xbfffefd4)     = -1 ENOENT (No such file or 
directory)
open("/usr/lib/mmx/libsmpeg-0.4.so.0", O_RDONLY) = -1 ENOENT (No such file 
or directory)
stat64("/usr/lib/mmx", 0xbfffefd4)      = -1 ENOENT (No such file or 
directory)
open("/usr/lib/libsmpeg-0.4.so.0", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240\215"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=278244, ...}) = 0
old_mmap(NULL, 394296, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40017000
mprotect(0x40057000, 132152, PROT_NONE) = 0
old_mmap(0x40057000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x3f000) = 0x40057000
old_mmap(0x4005b000, 115768, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4005b000
close(3)                                = 0
open("/usr/lib/libSDL-1.2.so.0", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240\320"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=345352, ...}) = 0
old_mmap(NULL, 379436, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40078000
mprotect(0x400ca000, 43564, PROT_NONE)  = 0
old_mmap(0x400ca000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x51000) = 0x400ca000
old_mmap(0x400cc000, 35372, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400cc000
close(3)                                = 0
open("/usr/lib/libpthread.so.0", O_RDONLY) = -1 ENOENT (No such file or 
directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=25358, ...}) = 0
old_mmap(NULL, 25358, PROT_READ, MAP_PRIVATE, 3, 0) = 0x400d5000
close(3)                                = 0
open("/lib/libpthread.so.0", O_RDONLY)  = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000D\0\000"..., 
1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=84512, ...}) = 0
old_mmap(NULL, 85496, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x400dc000
mprotect(0x400e9000, 32248, PROT_NONE)  = 0
old_mmap(0x400ea000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0xd000) = 0x400ea000
close(3)                                = 0
open("/usr/lib/libm.so.6", O_RDONLY)    = -1 ENOENT (No such file or 
directory)
open("/lib/libm.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`7\0\000"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=149532, ...}) = 0
old_mmap(NULL, 136308, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x400f1000
mprotect(0x40112000, 1140, PROT_NONE)   = 0
old_mmap(0x40112000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x20000) = 0x40112000
close(3)                                = 0
open("/usr/lib/libc.so.6", O_RDONLY)    = -1 ENOENT (No such file or 
directory)
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\370\223"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=1267976, ...}) = 0
old_mmap(NULL, 1225540, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40113000
mprotect(0x40234000, 41796, PROT_NONE)  = 0
old_mmap(0x40234000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x120000) = 0x40234000
old_mmap(0x4023b000, 13124, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4023b000
close(3)                                = 0
open("/usr/lib/libasound.so.1", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 M\0\000"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=98920, ...}) = 0
old_mmap(NULL, 99952, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4023f000
mprotect(0x40256000, 5744, PROT_NONE)   = 0
old_mmap(0x40256000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x16000) = 0x40256000
close(3)                                = 0
open("/usr/lib/libesd.so.0", O_RDONLY)  = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@ \0\000"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=30780, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x40258000
old_mmap(NULL, 33664, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40259000
mprotect(0x40260000, 4992, PROT_NONE)   = 0
old_mmap(0x40260000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x6000) = 0x40260000
close(3)                                = 0
open("/usr/lib/libaudiofile.so.0", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\20z\0\000"..., 
1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=136548, ...}) = 0
old_mmap(NULL, 137288, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40262000
mprotect(0x40281000, 10312, PROT_NONE)  = 0
old_mmap(0x40281000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x1e000) = 0x40281000
close(3)                                = 0
open("/usr/lib/libX11.so.6", O_RDONLY)  = -1 ENOENT (No such file or 
directory)
open("/usr/lib/libX11.so.6", O_RDONLY)  = -1 ENOENT (No such file or 
directory)
open("/usr/X11R6/lib/libX11.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\n\1"..., 1024) = 
1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=833588, ...}) = 0
old_mmap(NULL, 815544, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40284000
mprotect(0x40348000, 12728, PROT_NONE)  = 0
old_mmap(0x40348000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0xc3000) = 0x40348000
old_mmap(0x4034b000, 440, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4034b000
close(3)                                = 0
open("/usr/lib/libXext.so.6", O_RDONLY) = -1 ENOENT (No such file or 
directory)
open("/usr/lib/libXext.so.6", O_RDONLY) = -1 ENOENT (No such file or 
directory)
open("/usr/X11R6/lib/libXext.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220(\0"..., 1024) = 
1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=58596, ...}) = 0
old_mmap(NULL, 60668, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4034c000
mprotect(0x4035a000, 3324, PROT_NONE)   = 0
old_mmap(0x4035a000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0xd000) = 0x4035a000
close(3)                                = 0
open("/usr/lib/libdl.so.2", O_RDONLY)   = -1 ENOENT (No such file or 
directory)
open("/usr/lib/libdl.so.2", O_RDONLY)   = -1 ENOENT (No such file or 
directory)
open("/lib/libdl.so.2", O_RDONLY)       = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\34\34\0"..., 1024) 
= 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=10192, ...}) = 0
old_mmap(NULL, 12252, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4035b000
mprotect(0x4035d000, 4060, PROT_NONE)   = 0
old_mmap(0x4035d000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x1000) = 0x4035d000
close(3)                                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x4035e000
mprotect(0x40078000, 335872, PROT_READ|PROT_WRITE) = 0
mprotect(0x40078000, 335872, PROT_READ|PROT_EXEC) = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

Try some of the sample mpegs from http://portablehole.net/~jano/fridge/  These
mpegs worked fine, but if you give glmovie an invalid mpeg it seems to segfault.

Sorry.  Still segfaults.  plaympeg (which was my most reliable mpg player on
Slackware) 
segfaults even without any arguments.  It's supposed to display usage info. 
Strace output shows 
that it doesn't even get to the point of opening the .mpg file before it
segfaults...

ok, try an "ltrace" (dev-util/ltrace) and see if that gives us more info.

OK.  This one's just funny:

insyte@petra insyte $ ltrace plaympeg
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++
insyte@petra insyte $ ltrace plaympeg xd.mpg
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

Adding the -S flag to trace system calls returns output pretty much identical 
to strace.

Am I to understand that plaympeg/glmovie are working fine during your tests?  
This is a vanilla install of Gentoo r14...

For what it's worth:

petra root # ldd /usr/bin/plaympeg
        libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0x40017000)
        libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x40078000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x400dc000)
        libm.so.6 => /lib/libm.so.6 (0x400f1000)
        libc.so.6 => /lib/libc.so.6 (0x40113000)
        libasound.so.1 => /usr/lib/libasound.so.1 (0x4023f000)
        libesd.so.0 => /usr/lib/libesd.so.0 (0x40259000)
        libaudiofile.so.0 => /usr/lib/libaudiofile.so.0 (0x40262000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40284000)
        libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x4034c000)
        libdl.so.2 => /lib/libdl.so.2 (0x4035b000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

Are any other SDL-based apps working ok?  What version of libSDL
(media-libs/libsdl) do you have installed?  You might want to try rebuilding
libsdl and smpeg with fewer USE options defined (try turning off esd and alsa in
particular.)  

# ldd /usr/bin/plaympeg 
        libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0x40017000)
        libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x40076000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x400da000)
        libm.so.6 => /lib/libm.so.6 (0x400ef000)
        libc.so.6 => /lib/libc.so.6 (0x40111000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x4023d000)
        libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x40306000)
        libdl.so.2 => /lib/libdl.so.2 (0x40315000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

Latest versions of both libsdl and smpeg:
libsdl-1.2.3
smpeg-0.4.4-r1

I just rebuilt without alsa or esd, and it still segfaults immediately:
insyte@petra insyte $ ldd /usr/bin/plaympeg
        libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0x40017000)
        libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x40078000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x400da000)
        libm.so.6 => /lib/libm.so.6 (0x400ef000)
        libc.so.6 => /lib/libc.so.6 (0x40111000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x4023d000)
        libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x40306000)
        libaa.so.1 => /usr/lib/libaa.so.1 (0x40315000)
        libdl.so.2 => /lib/libdl.so.2 (0x40330000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
        libncurses.so.5 => /lib/libncurses.so.5 (0x40333000)
        libgpm.so.1 => /usr/lib/libgpm.so.1 (0x4037a000)

Tuxracer and gltron both link against libSDL and they're working fine.  I 
couldn't find any other ebuilds to try that list smpeg as a requirement, aside 
from smpeg-xmms, which another person has already reported as segfaulting on 
startup.  Oh, and pygame.  But I don't think that would be exceptionally useful 
as a testcase.

Try recompiling libsdl and smpeg with these USE settings:

USE="gnome gtk slang readline gpm berkdb gdbm tcpd pam libwww ssl X
nls mitshm perl python gif sdl vorbis ogg opengl mozilla"

That did it!  I'll do some experimenting later today and see if I can figure
out exactly which of my 
$USE settings was causing problems.  But on the off chance that you can spot
the culprit, here's 
what I've been using:

USE="readline gpm berkdb gdbm pam libwww ssl nls mitshm python gif sdl 
vorbis ogg gtk X qt opengl mozilla objprelink mmx tex aalib sse"

I had been using esd and alsa 
as well, but I removed those earlier per your recommendation.

It appears that media-libs/smpeg does NOT like --enable-mmx.  I removed 'mmx'
from my $USE and it 
works great!  Thanks for the help.  For what it's worth, I was building this
stuff on a Dell Inspiron 
8100, with a 1GHz PIII, so it certainly *should* support MMX.  Sounds like an
smpeg bug.  I'd be 
curious to see if anyone can reproduce it.

Now I feel like an idiot.  Another bug discussing the xmms-smpeg plugin
mentioned the same thing: 
smpeg crashes when given --enable-xmms.  Perhaps it would be a good idea to
remove it from the 
.ebuild...  ;-)

Hope drobbins dont mind me fixing, but I had the same problem ;)
Should be fixed in smpeg-0.4.4-r2.