Why video is choppy after burning with Copytodvd?

vbimport
#1

i copied dark knight with dvdfab (free version) to my harddrive, then used dvd shrink to get it under 4.3gb. then i used copytodvd (latest version, trial) to copy to a dvd with 1x speed. chapter 4-11 were choppy or did not work. what can i do to get better results? i am using a nexxtech dvd+r
looks like all but chapters 4-11 are good.

#2

Just burn the dvd shrink output with Imgburn, no need to run it through copytodvd. Make the shrink output an ISO file. Welcome to the forum.