An Online SWF Converter That Uses Command Line
If you are proficient in using command line, when you want to online convert SWF (http://www.swfkits.com/swf-to-video-sdk/) to video and audio formats like AVI, FLV, MOV, WMV, MP4, 3GP, MP3, AAC, AC3, M4A, etc. It is more convenient and efficient for you to use a server-based SWF to Video Converter.
As far as I know, MoyeaSWF to Video SDK is such an online SWF Converter(http://www.swfkits.com/swf-to-video-sdk/) that use command line and can convert multiple SWFs simultaneously. It is especially developed to convert local and online SWF to any format video files for developers' development goals.Besides, it supports video resizing and trimming to meet your specific needs.And you can convert SWF to AVI with alpha channel and keep perfectly the original effect.
For more detailed functions, just visit its website and download to try it by yourself.