Raise maximum reference frame limit and comment
NPE
Try to fix headless mode detection on Ubuntu 12.10

#37
Updated comment and log message
Ignore NPE to see if it helps with duplicate files showing up
Fixed filename in log
Formatting
Merge pull request #39 from valib/ffmpeg-subtitles

FFmpeg subtitles - 1st try plus fixed database error
Removed unused import
Formatting
FFmpeg subtitles - continue