Fix/hack for subtitles synchronization problem

Replaced the setting of fps for the video file based on some parameters by reading fps directly from the file with devede_newfiles.file_get_params

It is probably not the best way as the correct number is in videofile['ofps2'] but I am not sure if I can use - because if I could - why haven't you used in the first place?

Checking the fps each time is ugly but I believe it works correctly.