more subtitle fixes
more subtitle fixes

Blacklisting dvdsub for conversion since it is an image-based file.

Collisionc/sickbeard_mp4_automator,Filechaser/sickbeard_mp4_automator,Filechaser/sickbeard_mp4_automator,phtagn/sickbeard_mp4_automator,phtagn/sickbeard_mp4_automator,Collisionc/sickbeard_mp4_automator