ни в коем разе не связано с "захватом с экрана",
связано с обработкой *уже* полученного видео.

для захвата видео с экрана:

UVScreenCamera - Создание демо, презентаций, мануалов в SWF/AVI/EXE/UVF.
российская программа.

I Screen Recorder - full-featured screen record tool that allows you to easily capture and annotate anything on the screen

CamStudio is able to record all screen and audio activity on your computer and create industry-standard AVI video files and using its built-in SWF Producer can turn those AVIs into lean, mean, bandwidth-friendly Streaming Flash videos (SWFs)