Hello Ken I cut each show in 2 parts, and so created 4 mpg2 files, I glued the parts back with Nero to have my 2 mpg2 shows, then developped menus with titles&chapters and created the final DVD ... which is close to be full like you said ! My hypothesis is that there is a ressource (memory) optimization problem in videobuilder (v51 and v551b11) proportional to the size of the show and its complexity, and the memory available, preventing the program to create the 25 min mpg2s Claude