Reel-Deal

function aWarpSharp4xx (clip src, int "thresh", int "blur", int "type", int "depth", int "depthC", int "chroma", bool "lsb", string "cplace")
{
    depth  = default(depth, 16)
    depthC = default(depthC, src.IsYV24 ? depth : depth/2) #depth/3 is claimed to work better
    chroma = default(chroma, 4)
    lsb    = default(lsb, false)
    cplace = default(cplace, "MPEG2")

    assert(src.IsPlanar, "aWarpSharp4xx: input clip must be planar YUV")
    assert(0 <= chroma <= 6, "aWarpSharp4xx: argument chroma must be an integer between 0 and 6.")