Those are transcoding programs. That's why they are so fast. I will admit I am a real snob when it comes to video processing. I would have to write a long article about one vs the other. A quick answer would be transcoding a video usually results in a loss of quality for a variety of reasons. Furthermore transcoding can amplify any existing errors already existing.Personally, the 2 video apps of choice for me are VideoProc and HD Video Converter Factory Pro. With these 2 apps, I rip movies to full screen 1080p or higher each movie converts in under 3 minutes. and also convert multiple movies at the same very fast compared to the others.