function Pad( clip c, int length, int offset){
    b1 = BlankClip( c, offset)
    b2 = BlankClip( c, length - (c.FrameCount + offset))
    return b1 + c + b2
}

function SidebySide( clip left, clip right, int left_offset, int right_offset){
    MINOFFSET = Min( left_offset, right_offset)
    left_offset  = left_offset  - MINOFFSET
    right_offset = right_offset - MINOFFSET
    
    MAXLENGTH = Max ( left.FrameCount, right.FrameCount)
    left  = Pad( left,  MAXLENGTH, left_offset)
    right = Pad( right, MAXLENGTH, right_offset)
    
    vid = StackHorizontal( left, right)
    aud = MergeChannels( left.Normalize().ConvertToMono(), right.Normalize().ConvertToMono())
    return AudioDub( vid, aud)
}