[header] How to use mass free videos [title] Click button " add " on the top left to add swf or flv movies. [step] See the screenshot below : [title] Click " next " on the bottom right to preprocess the added flash movies. [step] The purpose of preprocessing is to convert swf files to flv format. 
I think this is because this app only directly burns flv movies to dvd. So it will convert swf movies to flv movies before burning, and the status of each added flv movie will be considered as (preprocessing) completed.