Why is it so hard to convert a VHS to DVD perfectly?

What would be the best device to convert VHS to File-DVD-cd and why can somebody tell me or give advices,?

• theres a lot devices but i don't know wich one is the best for me, i want conver a vhs to computer file, but not to heavy i mean don't use much space in my hard disk, also if i need, burn it in cd or dvd, connect to tv and from time to time record some programs and keep it as files or put directly to Youtube as well, theres something with this features??, i saw some, like pinnacle or roxio, but im not sure about if they can keep it in computer files and whit what extensions i mean not heavy extensions, and there's another the Easycap but im still not sure can somebody give some advices and help me to make the best choice and why i should take it?, thanks everyone

• Answer:

  I hope English isn't your first language because that whole thing you wrote is a train wreck. I think I know what you're asking. I think the easiest thing to do would be to use a tv capture card and then use software like pinnacle or roxio to burn it to a DVD and/or make a compressed video file.