[XviD-devel] SIGSEGV in interpolate8x8_halfpel_hv_xmm

[Peter Maersk-Moller]

Hi

Im using XViD through mp4live and I noticed that I sometimes gets a
segmentation fault in interpolate8x8_halfpel_hv_xmm() in
src/image/x86_asm/interpolate8x8_xmm.asm:337. It runs for seconds or
minutes and the falls over.

Here is the output from gdb

-----------------------------------------------------
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16386 (LWP 7351)]
0x409692d9 in interpolate8x8_halfpel_hv_xmm ()
     at ../../src/image/x86_asm/interpolate8x8_xmm.asm:337
337     ../../src/image/x86_asm/interpolate8x8_xmm.asm: No such file or director
y.
         in ../../src/image/x86_asm/interpolate8x8_xmm.asm
Current language:  auto; currently c
(gdb) where
#0  0x409692d9 in interpolate8x8_halfpel_hv_xmm ()
     at ../../src/image/x86_asm/interpolate8x8_xmm.asm:337
#1  0x40950b07 in interpolate8x8_switch2 ()
    from /usr/local/lib/libxvidcore.so.4
#2  0x7d7d7d7d in ?? ()
Cannot access memory at address 0x7d7d7d7c
(gdb)
------------------------------------------------------

I've noticed that the error to to some extend depends on encoder
resolution and source material. For some resolutions it fails more
often than with others. It also seems that an anlogue source (V4L grabbercard)
makes it fail more often than when using a digital more cleaner version.

I noticed the problem in Xvid 1.0.0 and 1.0.1. When possible, I'll test
it with 1.1 beta.

Anybody ever seen that problem ?

Kind regards

--PMM