patch to put the video compression in a SDL_Thread, based on kekko's work (VOGONS forums)
Archlinux AUR PKGBUILD : https://aur.archlinux.org/packages/bin32-dosbox-svn-video
VOGONS forums thread : http://www.vogons.org/viewtopic.php?t=38099
Based on : http://www.vogons.org/viewtopic.php?t=21705