This method adds all the videos in the library to be converted with the selected conversion profile.
A conversion job for each video will be created with the same conversion profile each time.
This method is used to detect crop values automatically
To do that the video is analysed, the length of the video is obtained.
Then a crop values detection is executed at 10 different places throughout the video
If manualCropSettings are chosen this method does not detect auto crop values.
The autoCrop values are then stored in the autocropvalues array for use during conversion passes.