$ gdb mplayer
GNU gdb 6.6-debian
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This GDB was configured as "x86_64-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) run -vf scale=640:-2:::::::1 source.avi
Starting program: /usr/local/bin/mplayer -vf scale=640:-2:::::::1 source.avi
[Thread debugging using libthread_db enabled]
[New Thread 47931528190432 (LWP 8663)]
MPlayer dev-SVN-r24799-4.1.3 (C) 2000-2007 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3700+ (Family: 15, Model: 39, Stepping: 1)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing source.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
AVI: No audio stream found -> no sound.
VIDEO:  [FFVH]  720x416  12bpp  25.000 fps  36448.7 kbps (4449.3 kbyte/s)
Clip info:
 Software: MEncoder dev-SVN-r24436-4.1.3
Opening video filter: [scale w=640 h=-2 arnd=1]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffhuffyuv] vfm: ffmpeg (FFmpeg HuffYUV)
==========================================================================
Audio: no sound
Starting playback...
VDec: vo config request - 720 x 416 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 2)
Movie-Aspect is undefined - no prescaling applied.
SwScaler: reducing / aligning filtersize 6 -> 8
SwScaler: reducing / aligning filtersize 6 -> 8
SwScaler: reducing / aligning filtersize 6 -> 6
SwScaler: reducing / aligning filtersize 6 -> 6
[swscaler @ 0xd77930]SwScaler: BICUBIC scaler, from yuv420p to yuv420p using MMX2
[swscaler @ 0xd77930]SwScaler: using 8-tap MMX scaler for horizontal luminance scaling
[swscaler @ 0xd77930]SwScaler: using 8-tap MMX scaler for horizontal chrominance scaling
[swscaler @ 0xd77930]SwScaler: using n-tap MMX scaler for vertical scaling (YV12 like)
[swscaler @ 0xd77930]SwScaler: 720x416 -> 640x370
VO: [xv] 640x370 => 640x370 Planar YV12 

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47931528190432 (LWP 8663)]
0x00000000005d6590 in swScale_MMX2 (c=0xf95800, src=0x7fffc91a7390, srcStride=0x7fffc91a73b0, srcSliceY=10, srcSliceH=2, 
    dst=0x102edc0, dstStride=0x7fffc91a73c0) at swscale_template.c:937
937                 YSCALEYUV2YV12X_ACCURATE(   0, CHR_MMX_FILTER_OFFSET, uDest, chrDstW)
(gdb) bt
#0  0x00000000005d6590 in swScale_MMX2 (c=0xf95800, src=0x7fffc91a7390, srcStride=0x7fffc91a73b0, srcSliceY=10, 
    srcSliceH=2, dst=0x102edc0, dstStride=0x7fffc91a73c0) at swscale_template.c:937
#1  0x00000000005ceaaf in sws_scale (c=0xf95800, src=<value optimized out>, srcStride=0xf32640, srcSliceY=10, srcSliceH=2, 
    dst=0x102edc0, dstStride=0x102ede0) at swscale.c:2559
#2  0x000000000050435b in scale (sws1=0xf98518, sws2=0x0, src=<value optimized out>, src_stride=0xf32640, y=16969344, h=48, 
    dst=0x6, dst_stride=0x102ede0, interlaced=0) at vf_scale.c:351
#3  0x00000000005044d0 in draw_slice (vf=<value optimized out>, src=0x101c788, stride=0x1, w=<value optimized out>, h=6, 
    x=<value optimized out>, y=16969344) at vf_scale.c:363
#4  0x0000000000519aa5 in draw_slice (s=<value optimized out>, src=<value optimized out>, offset=<value optimized out>, 
    y=16969344, type=<value optimized out>, height=48) at vd_ffmpeg.c:476
#5  0x0000000000755668 in draw_slice (s=0xf2de00, y=<value optimized out>) at huffyuv.c:957
#6  0x00000000007576ef in decode_frame (avctx=<value optimized out>, data=0xf2d8b0, data_size=0x7fffc91a76bc, 
    buf=<value optimized out>, buf_size=<value optimized out>) at huffyuv.c:1050
#7  0x0000000000673b13 in avcodec_decode_video (avctx=0xf2d9d0, picture=0xf2d8b0, got_picture_ptr=0x7fffc91a76bc, 
    buf=0xf408a0 "\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b", buf_size=168556) at utils.c:939
#8  0x0000000000519045 in decode (sh=0xf18be0, data=0xf408a0, len=168556, flags=0) at vd_ffmpeg.c:783
#9  0x00000000004dfb0f in decode_video (sh_video=0xf18be0, 
    start=0xf408a0 "\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b\206E$#\020\b\b\a?\n \t\t@\nK\a\020\b $E\206\b", in_size=168556, drop_frame=0, pts=0.039999999105930328) at dec_video.c:366
#10 0x000000000046a468 in main (argc=4, argv=<value optimized out>) at mplayer.c:2043
(gdb) disass $pc-32 $pc+32
Dump of assembler code from 0x5d6570 to 0x5d65b0:
0x00000000005d6570 <swScale_MMX2+7456>: add    %cl,0xffffffffffffff8d(%rax)
0x00000000005d6573 <swScale_MMX2+7459>: xchg   %eax,%edi
0x00000000005d6574 <swScale_MMX2+7460>: pop    %rax
0x00000000005d6575 <swScale_MMX2+7461>: adc    %al,(%rax)
0x00000000005d6577 <swScale_MMX2+7463>: add    %cl,0x31(%rax)
0x00000000005d657a <swScale_MMX2+7466>: rorb   $0xef,(%rdi)
0x00000000005d657d <swScale_MMX2+7469>: in     $0xf,%al
0x00000000005d657f <swScale_MMX2+7471>: out    %eax,(%dx)
0x00000000005d6580 <swScale_MMX2+7472>: in     (%dx),%eax
0x00000000005d6581 <swScale_MMX2+7473>: pxor   %mm6,%mm6
0x00000000005d6584 <swScale_MMX2+7476>: pxor   %mm7,%mm7
0x00000000005d6587 <swScale_MMX2+7479>: mov    (%rdx),%rsi
0x00000000005d658a <swScale_MMX2+7482>: nopw   0x0(%rax,%rax,1)
0x00000000005d6590 <swScale_MMX2+7488>: movq   (%rsi,%rax,2),%mm0
0x00000000005d6594 <swScale_MMX2+7492>: movq   0x8(%rsi,%rax,2),%mm2
0x00000000005d6599 <swScale_MMX2+7497>: mov    0x4(%rdx),%rsi
0x00000000005d659d <swScale_MMX2+7501>: movq   (%rsi,%rax,2),%mm1
0x00000000005d65a1 <swScale_MMX2+7505>: movq   %mm0,%mm3
0x00000000005d65a4 <swScale_MMX2+7508>: punpcklwd %mm1,%mm0
0x00000000005d65a7 <swScale_MMX2+7511>: punpckhwd %mm1,%mm3
0x00000000005d65aa <swScale_MMX2+7514>: movq   0x8(%rdx),%mm1
0x00000000005d65ae <swScale_MMX2+7518>: pmaddwd %mm1,%mm0
End of assembler dump.
(gdb) info all-registers
rax            0x0      0
rbx            0xf95800 16340992
rcx            0x1      1
rdx            0xf99570 16356720
rsi            0xfaefc000fad070 70632352106860656
rdi            0xf98518 16352536
rbp            0xfa1978 0xfa1978
rsp            0x7fffc91a6c10   0x7fffc91a6c10
r8             0x30     48
r9             0x6      6
r10            0x102ee80        16969344
r11            0x101c788        16893832
r12            0xfa1a28 16390696
r13            0x6      6
r14            0x10772c0        17265344
r15            0x1068b80        17206144
rip            0x5d6590 0x5d6590 <swScale_MMX2+7488>
eflags         0x10246  [ PF ZF IF RF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0
st0            -nan(0x4000400040004000) (raw 0xffff4000400040004000)
st1            -nan(0xfe37354d0fa1fcdb) (raw 0xfffffe37354d0fa1fcdb)
st2            -nan(0x80008000800080)   (raw 0xffff0080008000800080)
st3            -nan(0x20f3ffffff0d)     (raw 0xffff000020f3ffffff0d)
st4            <invalid float value>    (raw 0xffff0000000000000000)
st5            <invalid float value>    (raw 0xffff0000000000000000)
st6            <invalid float value>    (raw 0xffff0000000000000000)
st7            <invalid float value>    (raw 0xffff0000000000000000)
fctrl          0x37f    895
fstat          0x0      0
ftag           0xaaaa   43690
fiseg          0x0      0
fioff          0x0      0
foseg          0x0      0
fooff          0x0      0
fop            0x0      0
xmm0           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {
    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, 
  uint128 = 0x00000000000000000000000000000000}
xmm1           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {
    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, 
  uint128 = 0x00000000000000000000000000000000}
xmm2           {v4_float = {0x400, 0x5, 0x0, 0x0}, v2_double = {0xe71, 0x0}, v16_int8 = {0x0, 0x0, 0x80, 0x44, 0x0, 0xe2, 
    0xac, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x4480, 0xe200, 0x40ac, 0x0, 0x0, 0x0, 0x0}, 
---Type <return> to continue, or q <return> to quit---
  v4_int32 = {0x44800000, 0x40ace200, 0x0, 0x0}, v2_int64 = {0x40ace20044800000, 0x0}, 
  uint128 = 0x000000000000000040ace20044800000}
xmm3           {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x39, 0xb2, 0x95, 0xe1, 0x7a, 
    0xc9, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x3900, 0x95b2, 0x7ae1, 0x3fc9, 0x0, 0x0, 0x0, 0x0}, 
  v4_int32 = {0x95b23900, 0x3fc97ae1, 0x0, 0x0}, v2_int64 = {0x3fc97ae195b23900, 0x0}, 
  uint128 = 0x00000000000000003fc97ae195b23900}
xmm4           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
    0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x8000, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 
    0x80000000, 0x0, 0x0}, v2_int64 = {0x8000000000000000, 0x0}, uint128 = 0x00000000000000008000000000000000}
xmm5           {v4_float = {0x2b020000, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0xfc, 0xa9, 0xf1, 0xd2, 0x4d, 
    0x62, 0x60, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xa9fc, 0xd2f1, 0x624d, 0x3f60, 0x0, 0x0, 0x0, 
    0x0}, v4_int32 = {0xd2f1a9fc, 0x3f60624d, 0x0, 0x0}, v2_int64 = {0x3f60624dd2f1a9fc, 0x0}, 
  uint128 = 0x00000000000000003f60624dd2f1a9fc}
xmm6           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {
    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, 
  uint128 = 0x00000000000000000000000000000000}
xmm7           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x54, 0xec, 0x35, 0x16, 0xb3, 0xe9, 
    0x8f, 0xbd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xec54, 0x1635, 0xe9b3, 0xbd8f, 0x0, 0x0, 0x0, 0x0}, 
  v4_int32 = {0x1635ec54, 0xbd8fe9b3, 0x0, 0x0}, v2_int64 = {0xbd8fe9b31635ec54, 0x0}, 
  uint128 = 0x0000000000000000bd8fe9b31635ec54}
xmm8           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x29, 0xf2, 0x88, 0x6c, 0xa6, 0x49, 
    0xde, 0x3e, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xf229, 0x6c88, 0x49a6, 0x3ede, 0x0, 0x0, 0x0, 0x0}, 
  v4_int32 = {0x6c88f229, 0x3ede49a6, 0x0, 0x0}, v2_int64 = {0x3ede49a66c88f229, 0x0}, 
  uint128 = 0x00000000000000003ede49a66c88f229}
xmm9           {v4_float = {0x9689a800, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x6a, 0xa2, 0x65, 0x50, 0xf2, 
    0xea, 0x8f, 0xbd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xa26a, 0x5065, 0xeaf2, 0xbd8f, 0x0, 0x0, 0x0, 
    0x0}, v4_int32 = {0x5065a26a, 0xbd8feaf2, 0x0, 0x0}, v2_int64 = {0xbd8feaf25065a26a, 0x0}, 
  uint128 = 0x0000000000000000bd8feaf25065a26a}
xmm10          {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0}, v16_int8 = {0x6d, 0x7d, 0xbf, 0xbb, 0x27, 0xaf, 
    0xf5, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x7d6d, 0xbbbf, 0xaf27, 0x3ff5, 0x0, 0x0, 0x0, 0x0}, 
  v4_int32 = {0xbbbf7d6d, 0x3ff5af27, 0x0, 0x0}, v2_int64 = {0x3ff5af27bbbf7d6d, 0x0}, 
  uint128 = 0x00000000000000003ff5af27bbbf7d6d}
xmm11          {v4_float = {0x0, 0xfffffffd, 0x0, 0x0}, v2_double = {0xffffffffffffffd2, 0x0}, v16_int8 = {0xe0, 0xe6, 
    0x35, 0x67, 0x9e, 0x6, 0x47, 0xc0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xe6e0, 0x6735, 0x69e, 0xc047, 
    0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x6735e6e0, 0xc047069e, 0x0, 0x0}, v2_int64 = {0xc047069e6735e6e0, 0x0}, 
  uint128 = 0x0000000000000000c047069e6735e6e0}
xmm12          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {
    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, 
  uint128 = 0x00000000000000000000000000000000}
xmm13          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x0, 0x46, 0x84, 0x24, 0x59, 
    0xd6, 0x3e, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x8446, 0x5924, 0x3ed6, 0x0, 0x0, 0x0, 0x0}, 
  v4_int32 = {0x84460000, 0x3ed65924, 0x0, 0x0}, v2_int64 = {0x3ed6592484460000, 0x0}, 
  uint128 = 0x00000000000000003ed6592484460000}
xmm14          {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf0, 
    0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x3ff0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 
    0x3ff00000, 0x0, 0x0}, v2_int64 = {0x3ff0000000000000, 0x0}, uint128 = 0x00000000000000003ff0000000000000}
xmm15          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x8e, 0x85, 0x83, 0xe8, 0xf0, 0x24, 
    0x53, 0x3c, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x858e, 0xe883, 0x24f0, 0x3c53, 0x0, 0x0, 0x0, 0x0}, 
---Type <return> to continue, or q <return> to quit---
  v4_int32 = {0xe883858e, 0x3c5324f0, 0x0, 0x0}, v2_int64 = {0x3c5324f0e883858e, 0x0}, 
  uint128 = 0x00000000000000003c5324f0e883858e}
mxcsr          0x1fa0   [ PE IM DM ZM OM UM PM ]