output subtitles still out of sync

[ah3243]

I tried running this on dune and i think because of the different (fictional languages) it failed giving an offset close to a minute. Adding in an option to select that language it should use for syncronization could be really useful or adding a value for the detection confidence to use.

[bataroland]

Yeah, my problem too. I tried to run ffsubsync on my video and ass file, then it given almost 1 minute offset, instead of 1 second offset. @smacke? I can provide test data