Software :: Finding A Tool That Can Directly Convert Mp3 File To A Swf File?

I'm looking for a tool that can directly convert mp3 file to a swf file. Tried ffmprg - 'ffmpeg -i master.mp3 -ar 22050 -ab 32 -f swf -y -vn new.swf', output is as follows:

Output #0, swf, to 'new.swf':
Stream #0.0: Audio: 0x0000, 22050 Hz, stereo, 0 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Unsupported codec for output stream #0.0

I found a way to perform this task using ffmpeg to convert the mp3 file to a wav file, and converting the wav into a swf file using swftools (wav2swf), although this is not a good option because the output swf file size is very big - for a 12mb input 320kbps stereo mp3 file, the swf file is 25mb. Also downloaded a free direct mp3 to swf conversion software, which had an output swf file - with the same 12mb mp3 file - of ~400kb.

The requirements I have from the tool are:

1. Can be ran from the shell.

2. Direct conversion, or an indirect one that will produce a small output swf file.

3. Suport for multiple file conversion is a plus.