Multimedia: avi movies i convert to dvd-disks come out blank

avi movies i convert to dvd-disks come out blank

all downloaded avi movies that i convert to dvds come out blank, even though software says completed successfully. i put avi movie in dvd flick to change to dvd files. i tried it 2 ways: changed to video ts files, then put in dvd shrink to make iso file then burned in image burn to verbatim dvd-r disk. blank. then tried having dvd flick change directly to iso file to burn in image burn afterward. blank. the files are on my pc with the right amount of gigabytes, but on the final disk, nothing-0 gb. have done this with different movies. all other movies burn, just can't burn those that are downloaded avi files. i have never been able to burn an avi to a dvd disk. my burner is fine. i can watch the converted movies on my pc, just nothing on the burned disk. must be an issue with the conversion of avi to dvd. help please.