More FFMPEG error reporting
More FFMPEG error reporting

Should give more information for better debugging

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