insertsign

# fixed ver. to deal with HD video correctly v.1.38 mod by AmjadSONY

function insertsign(clip mainclip, clip overlayclip, int startframe, int "endframe", int "xoffset", int "yoffset", clip "External") {
    # make the endframe parameter optional (defaulting to where the overlay clip ends)
    endframe = default(endframe,startframe+overlayclip.framecount-1)
    endframe = (endframe == 0) ? startframe+overlayclip.framecount()-1 : endframe
    endframe = (endframe >= mainclip.framecount()-1) ? mainclip.framecount()-1 : endframe

    # make sure the special case startframe=1 is dealt with correctly
    # (needed because trim(0,0) returns the entire clip, which is obviously not what we want)
    # note that the first frame of the clip is ZER0, _not_ one!
    begin   = (startframe == 1) ? mainclip.trim(0,-1) : mainclip.trim(0,startframe-1)
    middle  = mainclip.trim(startframe,endframe)
    end = (endframe == mainclip.framecount()-1) ? blankclip(mainclip,length=0) : mainclip.trim(endframe+1,0)

    sisphbd = AvsPlusVersionNumber > 2294
    shasalp = sisphbd ? middle.IsRGB64() || middle.IsRGB32() : middle.IsRGB32()
    middleoverlay = shasalp ? Layer(middle,overlayclip, "add", x=xoffset, y=yoffset) : Overlay(middle, defined(External) ? External : overlayclip.IsRGB() && !(middle.IsRGB()) ? (VersionNumber() < 2.60) ? \
    (mainclip.height() < 600) ?  overlayclip.ConvertToYV12() : overlayclip.ConvertToYV12(matrix="Rec709") : \
    (mainclip.height() < 600) ?  sisphbd ? overlayclip.ConvertToYUV444() : overlayclip.ConvertToYV24() : sisphbd ? overlayclip.ConvertToYUV444(matrix=mainclip.BitsPerComponent() > 8 && mainclip.width() > 1440 ? "rec2020" : "Rec709") : overlayclip.ConvertToYV24(matrix="Rec709") : overlayclip, mask=overlayclip.showalpha(), x=xoffset, y=yoffset)

    # deal with the special case startframe=0 (in which case we don't have anything before the overlay)
    # note that trim(-1,0) does nothing (it returns the same as trim(0,0)...)

    final = (startframe == 0) ? middleoverlay ++ end : begin ++ middleoverlay ++ end
    return final
}