[FFmpeg-user] Convert SWF to mp4?

[look at ebookring.net]

I'm trying to convert an SWF file to MP4 to no success.

My machine is running Ubuntu 10.04

Here's the code and error message I'm getting-

DellBox at DellBox-top:~/Desktop$ ffmpeg -i woof.swf -c:v libx264 -c:a 
libvo_aacenc -ac 2 woof.mp4
ffmpeg version git-2012-11-01-bacebe1 Copyright (c) 2000-2012 the 
FFmpeg developers
   built on Nov  1 2012 16:27:51 with gcc 4.4.3 (Ubuntu 
4.4.3-4ubuntu5.1)
   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame 
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora 
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree 
--enable-version3 --enable-x11grab
   libavutil      52.  1.100 / 52.  1.100
   libavcodec     54. 70.100 / 54. 70.100
   libavformat    54. 35.100 / 54. 35.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 21.106 /  3. 21.106
   libswscale      2.  1.102 /  2.  1.102
   libswresample   0. 16.100 /  0. 16.100
   libpostproc    52.  1.100 / 52.  1.100
[swf @ 0xa67c500] SWF compressed file detected
[swf @ 0xa67c500] Estimating duration from bitrate, this may be 
inaccurate
woof.swf: could not find codec parameters



How can it be done?