Problems with burned DVD5`s

[Fred12]

Hiho , I hope this is the right thread... so I have got some problems...I made several conversions now from DVD9 to DVD5 and I also burned games which where already from DVD5 Image format but it never worked... I wasted now 6 DVDs like that and I dont really know what the problem is...(games are all working properly) I also installed ISOBuster and all files were shown on the DVD but when I insert them into drive it shows me they`re empty and the burning dialogue pops up....
Before all was still working right - the burned DVDs worked but just since a week ago I was having those problems.... no burned dvd could be recognized anymore... so does anybody know these problems and can help me ???

PS: I also converted different movie-formats into DVD and burned them and it also couldnt be played neither on PC nor on DVD-Player... thats really sad (