this is an example file for https://roundup.mplayerhq.hu/roundup/ffmpeg/issue684

(gdb) bt
#0  vp6_parse_coeff_huffman (s=0x9d16db0) at /srv/scratch/packages/ffmpeg/upstream/trunk/libavcodec/bitstream.h:880
#1  0x083e43b1 in vp56_decode_frame (avctx=0x9cdbf00, data=0x9ce2b80, data_size=0xb5d6d384, buf=0x9d775e0 "", buf_size=18684)
    at /srv/scratch/packages/ffmpeg/upstream/trunk/libavcodec/vp56.c:410
#2  0x08125d4e in avcodec_decode_video (avctx=0x9cdbf00, picture=0x9ce2b80, got_picture_ptr=0xb5d6d384, buf=0x9d775e0 "", 
    buf_size=18684) at /srv/scratch/packages/ffmpeg/upstream/trunk/libavcodec/utils.c:922
#3  0x080653ee in video_thread (arg=0xb6d70020) at /srv/scratch/packages/ffmpeg/upstream/trunk/ffplay.c:1360
#4  0xb7bac2ab in ?? () from /usr/lib/libSDL-1.2.so.0
#5  0xb7bf9bed in ?? () from /usr/lib/libSDL-1.2.so.0
#6  0xb7b8b50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb7b087ee in clone () from /lib/tls/i686/cmov/libc.so.6
(gdb) disass $pc-32 $pc+32
Dump of assembler code from 0x83e4391 to 0x83e43d1:
0x083e4391 <vp56_decode_frame+1121>:  mov    $0xe824,%esp
0x083e4396 <vp56_decode_frame+1126>:  add    %cl,-0x24bf7ad4(%ebx)
0x083e439c <vp56_decode_frame+1132>:  push   %esi
0x083e439d <vp56_decode_frame+1133>:  or     %dh,(%ecx)
0x083e439f <vp56_decode_frame+1135>:  (bad)  
0x083e43a0 <vp56_decode_frame+1136>:  rep stos %eax,%es:(%edi)
0x083e43a2 <vp56_decode_frame+1138>:  xor    %edi,%edi
0x083e43a4 <vp56_decode_frame+1140>:  mov    0x70(%esp),%edx
0x083e43a8 <vp56_decode_frame+1144>:  mov    %edx,(%esp)
0x083e43ab <vp56_decode_frame+1147>:  call   *0x15d0(%edx)
0x083e43b1 <vp56_decode_frame+1153>:  mov    0x70(%esp),%ecx
0x083e43b5 <vp56_decode_frame+1157>:  movzbl 0xca0(%ecx),%eax
0x083e43bc <vp56_decode_frame+1164>:  mov    (%ecx),%ebx
0x083e43be <vp56_decode_frame+1166>:  lea    0x1140(%ecx,%eax,2),%esi
0x083e43c5 <vp56_decode_frame+1173>:  mov    %ebx,0x50(%esp)
0x083e43c9 <vp56_decode_frame+1177>:  jmp    0x83e4444 <vp56_decode_frame+1300>
0x083e43cb <vp56_decode_frame+1179>:  nop    
0x083e43cc <vp56_decode_frame+1180>:  lea    0x0(%esi,%eiz,1),%esi
0x083e43d0 <vp56_decode_frame+1184>:  movzbl 0x856dc80(%edi),%ecx
End of assembler dump.
(gdb) info all-registers
eax            0x0	0
ecx            0x0	0
edx            0x0	0
ebx            0x9d16db0	164720048
esp            0xb5d6d080	0xb5d6d080
ebp            0x0		0x0
esi            0x9d16db0	164720048
edi            0x0		0
eip            0x83e43b1	0x83e43b1 <vp56_decode_frame+1153>
eflags         0x210246		[ PF ZF IF RF ID ]
cs             0x73		115
ss             0x7b		123
ds             0x7b		123
es             0x7b		123
fs             0x0		0
gs             0x33		51
st0            -nan(0x8282828282828282)	(raw 0xffff8282828282828282)
st1            -nan(0x8080808080808080)	(raw 0xffff8080808080808080)
st2            -nan(0x8484848484848484)	(raw 0xffff8484848484848484)
st3            -nan(0x84008400840084)	(raw 0xffff0084008400840084)
st4            -nan(0x84008400840084)	(raw 0xffff0084008400840084)
st5            0.00049999999999999999997924769279226964	(raw 0x3ff483126e978d4fdf3b)
st6            123456					(raw 0x400ff120000000000000)
st7            3.9660000000000001918465386552270502	(raw 0x4000fdd2f1a9fbe77000)
fctrl          0x37f					895
fstat          0x4020					16416
ftag           0xffff					65535
fiseg          0x73					115
fioff          0x8065722				134633250
foseg          0x7b					123
fooff          0xb6e3cc28				-1226585048
fop            0x55d					1373
xmm0           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 
    0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 0x2, 0x0}, v8_int16 = {0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2}, v4_int32 = {0x20002, 0x20002, 
    0x20002, 0x20002}, v2_int64 = {0x2000200020002, 0x2000200020002}, uint128 = 0x00020002000200020002000200020002}
xmm1           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 
    0x2, 0x0, 0x2, 0x0, 0x2, 0x0, 0x2, 0x0}, v8_int16 = {0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2}, v4_int32 = {0x20002, 0x20002, 
    0x20002, 0x20002}, v2_int64 = {0x2000200020002, 0x2000200020002}, uint128 = 0x00020