ffmpeg multiple inputs, single output

[nkarnold]

Ive been trying to get the following working in ffmpeg, but having no joy.

I want to take say, 3 inputs (3 vobs ) and have a single output.
Ive tried the following

ffmpeg -i VOB1.VOB -i VOB2.VOB -i VOB3.VOB {Params skipped} outputfile.avi

The outputfile contains just the VOB1 output

anyone any ideas if what Im trying to do is possible and if so how ?

Thanks in advance

N