Some DVD5 to DVD5 backups don't work

[AgNa]

Ok, Im a newbie to the DVD back up world. I own a DVDRW drive since 1 week ago. I started backing up my DVDs but i foud that some doesnt work. I made them all in the same way, with the same media, burned with the same software, etc.
The 3 DVD that give me problems are music Concerts DVDs. I tried puting them on my HD via DVDecrypter, in ISO mode, in File mode and burning them with diferent software, in diferent media, at diferent speed but they still not work on my stand alone DVDplayer. All other DVD back ups works great.
What could be the problem? I noticed that all 3 DVDs are DVD5 so I dont need to re-encode the video. I even tried to do that with DVDshrink and the result, like in always works on my PC but not on my DVD. I took the 6 coasters I got trying to make a succesfull bak up to a friends DVD and it works there. Any Idea? any other info you need to give me a hint? IFO files text? :confused: :confused: The titles are

Tool - Salival
Cradle of Filth - Pandaemonaeon
typ o negative - After Dark

I also put some Other movies from DVD5 to DVD without a problem. :confused: When I put the DVDs on my stand alone it make some ugly noises like its trying to find something and then it hangs or just spits the DVD

[ammck55]

Originally posted by AgNa
I took the 6 coasters I got trying to make a succesfull bak up to a friends DVD and it works there.
If the discs play on a friend's player, but not yours, this is usually a media problem. Check for compatibility with dvdrhelp.com's (http://www.videohelp.com/dvdplayers) player/media database. If this doesn't help, supply as much info as you can, and check back.

ammck55