Firewire capture file size setting

hi guys. where is the setting for firewire capture so instead of creating a new file after it reaches 1GB, it will record until 3.5GB or whatever I choose? As it stands now when I capture firewire within kdenlive it'll save the file once it reaches 1000MB and then start a new file. I capture xbox 360 gameplay and my game modes last longer then 1000MB worth of data. I'd like to increase the number so I don't have multiple clips when I create my project. Thanks