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I recommend you moyea swf to video converter pro, which can greatly convert all kinds of swf to video in any popular formats, including avi and avi with alpha channel. it's the best swf convert I have ever used.

you can get the swf converter from http://www.swfkits.com/swf_to_video/

You can try iwisoft swf to avi converter, it supports swf to divx/xvid. The best one.

Magic Swf2Avi can help you convert swf to divx avi, simply, directly, high-quality.

you can download this software FREE:

http://www.google.com/search?hl=en&q=magic+swf2avi

or

http://effectmatrix.com/swf2avi/index.htm

features:

a. Professional, High-Quality, No skip frames and Lossless audio for your Flash conversion

b. One step to convert flash(swf) to your iPod, PSP, Zune, 3GP mobile phone(Nokia, Sony Ericsson, Motorola), Apple TV, iPhone, etc.

c. Convert and Burn flash(swf) file to DVD, SVCD, VCD and Audio CD.

d. Support the output video formats: AVI, MPEG, MPEG2 TS, MP4, WMV, 3GP, GIF, H.264/MPEG-4 AVC, H.264/PSP AVC Video, MOV, FLV, etc..

e. Extract and Convert flash(swf) file audio to other popular audio formats, like MP2, MP3, AC3, WMA, WAV, FLAC, M4A, OGG, AAC, AU, MMF etc..

f. Convert flash(swf) to JPG, BMP image sequences, TAG, TIFF, PNG image sequences with alpha transparent channel.

I often use this software to help me, you also can try it , you can download here:

http://www.flash-to-video.com/products/swf-to-vide...

Here also a guide for you:

http://www.flash-to-video.com/blog/?p=144

This is a powerful Swf to Video Converter software that can perfectly convert Macromedia SWF to AVI, MPEG, MOV, FLV, 3GP video (3GPP/3GPP2), MP4 (iPod video, iPhone video and PSP video), WMV (Zune video and Pocket PC video), etc, with excellent picture quality and sound quality for sharing and private entertainment. And Convert Flash SWF files to image series (Animated GIF, JPEG, GIF, PNG, TIFF, BMP).

certainly, http://answers.yahoo.com/ will offer you more options

I hope this may help you.