I tried 4-5 products and found that SWF to Mpeg converter was the best at aligning the audio and timing of my swf file. While there are a few spots that aren't perfect in my converted file, Moyea did much better than all the others - the other products I used cut out chunks of audio or screwed up the timing of certain slides and animations, so the video would end up being crappy.

I can also capture pictures during playing the SWF, so I can make use of the picture.
freeware video. Also, the quality of the conversion comes at a time price, too - it takes along time to convert the file.
All this said, I didn't find a better product.
here you can have a free trial on http://www.swfkits.com/swf_to_mpeg/