[Swftools-common] Avi2SWF not working for me

[stuff]

I run this command:
avi2swf wendy.avi -o wendy.swf

and get the following output. It also gives me a 46 byte file. Any ideas how 
to get this working?

Thanks.

<init> : Avifile CVS-0.7.43-050620-05:05-10.1
<init> : Available CPU flags: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
<init> : 4294.97 MHz Intel(R) Pentium(R) 4 CPU 2.40GHz processor detected
<reader> : Checking: wendy.avi
<AVI reader> : MainHeader: MicroSecPerFrame=33366 MaxBytesPerSec=0
 PaddingGranularity=0 Flags=[ HAS_INDEX IS_INTERLEAVED TRUST_CKTYPE ] 
TotalFrames=589
 InitialFrames=0 Streams=2 SuggestedBufferSize=0 WxH=176x120
 Scale=0 Rate=0 Start=0 Length=0
<AVI reader> : StreamHeader: Type=vids Handler=FMP4 Flags=[ ]
 InitialFrames=0 Scale=100 Rate=2997 Start=0 Length=589
 SuggestedBufferSize=3198 Quality=0 SampleSize=0 Rect l,r,t,b=0,176,0,120
<AVI reader> : StreamHeader: Type=auds Handler=0x55 Flags=[ ]
 InitialFrames=0 Scale=1152 Rate=44100 Start=0 Length=772
 SuggestedBufferSize=313 Quality=0 SampleSize=0 Rect l,r,t,b=0,0,0,0
<AVI reader> : InfoChunk Software:  MEncoder 1.0pre7-3.4.1
<AVI reader> : Reading index from offset: 229830
<AVI reader> : Stream 0 vids : FMP4 (0x34504d46) 589 chunks (2.30KB)
<AVI reader> : Stream 1 auds : MPEG Layer-3 (0x55) 772 chunks (6.03KB)
<reader> : Initialized audio stream (chunk tblsz: 772, fmtsz: 30)
<audio reader> : MPEG1 Layer-3 44100Hz 32kbps JointStereo (1152,40,104)
<reader> : Initialized video stream (chunk tblsz: 589, fmtsz: 40)
<codec keeper> : Found 7 plugins (/usr/lib/avifile-0.7,A:24,V:28)
<codec keeper> : CreateVideoDecoder(): Unknown codec 0x34504d46 = "FMP4"
<codec keeper> : FF MPEG Layer-3 audio decoder created
formatinfo: format 1, 2 channels, 16 bits/sample, rate 44100, blockalign 4

Converting frame 0