Ac3 help

[towerblocks]

Hi

I need to convert my AC3 23.976fps to 25.000fps,Which i can do with AC3Machine,But im not sure what type it is,In virtualdub it says its 5 (STEREO),Picture here http://img.villagephotos.com/p/2004-9/825146/vdub.JPG,So im not to sure what channels mode to select in AC3Machine,Im thinking it can be only one of 4 options,5.1,stereo,surround,surround2,Any help would be appreciated.


thanks:)

[KpeX]

This appears to be a 5.1 448 kbps stream.