How to fit 80 minutes of .avi file into 1 DVD?

[varoeun]

Hi,
I have two .avi files, in total it is about 80 minutes. However, 1 dvd only fit about 62 minutes.
I bought a Pinnacle Instant CD?DVD 8 in which it has a Pinnacle Expression. This tool can fit more than 80 minutes happily. However, when I write it to dvd, after about 10 minutes, it has runtime error. Does anyone have the same experience?
Is there any other way to fit 80 minutes into one dvd? If yes, how and please tell the steps and program. For a 60 minutes video, I use Sonic MyDVD, but it only accepts up to about 60 minutes.
Thanks

[Baldrick]

You can fit several hours per dvd if you lower the video bitrate/video quality. Just use better tools like Convertxtodvd or convert/encode with a separate tool where you can set the exact output size like tmpgenc and author with tda.