how come when i transcode from AVI to DVD(VOB) some 30mins film takes only 15mins to transcode, and how come some 30mins film takes the whole 30mins to transcode.....settings are all the same(bitrate,audiorate,etc..) what makes the difference is that film A comprises of 12 episodes of AVI transcode to DVD and each film is 24-30 takes only 15mins to transcode, while film B has 13 episodes of AVI and each film is 24-30mins takes each film 30mins to transcode...why is this???using and base from experience of Ulead DVD Workshop 2 and Nerovision....