I know TMPGEnc Express can perform interpolation while deinterlacing. What I'm wondering is if I'm converting some 15fps video to 30fps... will TMPGEnc Express just double existing frames? Or will it generate new intermediate ones? Haven't found any answer yet on line. Thanks.
I don't think it creates intermediate frames. Why don't you do a small section and look at it frame by frame. You'll soon see.