You should know, 4.7gb is data dvd limit, 120mins video dvd limit. If you just want to burn these videos on a DVD disk as a data dvd for backup, you just need to keep the total size of all videos lower than disk capability(4.7gb), don't care about the 120mins time limit, your videos is only 1gb all together, so you can use any data dvd burning software directly burn all videos onto a 4.7gb dvd disk as a data dvd, like, I'm using RZ Free DVD Burner, it's free and easy to use, it can directly burn any files or folders to any DVD disk as data dvd, just run RZ Free DVD Burner, select "Data Burn" mode to burn, and then you can open the burned data dvd on computer, but can't play data DVD on DVD player.
Or if you want to burn these videos on a DVD disk as a video DVD that can be played well on DVD player, you should care about the 4.7gb size limit and 120mins time limit, because usually video DVD limit the total length of all videos lower than 120mins, but now with some better software, you can expand this limit, like I'm using RZ DVD Creator, it can fit/burn long videos into a video DVD, it can auto fit the size, such as convert 800mins videos to a video DVD and burn onto a 4.7gb dvd disk, easy to use, insert a 4.7gb DVD disk into your comptuer dvd burner drive, run RZ DVD Creator, select the dvd burner drive as target folder, directly drag and drop all videos into the software, if you view a message tip "Source DVD size is larger than CD/DVD disc capacity", simply press "Yes", at last press START button, the software will compress and convert all videos to a video DVD and burn into the inserted 4.7gb DVD disk, and you can play the burned video DVD well on your DVD players. But you should note, fit too many videos onto a video DVD will reduce the quality alot, according to my experience, 120-240 mins videos is the good range for a video DVD on a 4.7gb dvd disk.
You can yahoo or google search and download RZ Free DVD Burner or RZ DVD Creator, both easy to use , hope them could help you.