Frame area

[coolgit]

src=LSMASHVideoSource("filename.mp4", format="YUV420P10", fpsnum=25, fpsden=1).ConvertBits(8, dither=0).KillAudio()

Function FrameAreaS(clip c, int L, int T, int R, int B, String Op) { # https://forum.doom9.org/showthread.php?p=1603343#post1603343

    # Modulo 4 coords
    L = L - (L % 4)
    T = T - (T % 4)
    R = (R + 3) / 4 * 4
    B = (B + 3) / 4 * 4

    Area=c.crop(L,T,R-L,B-T)
    Left = L > 0           ? c.crop(0,T,L,B-T)                 : NOP
    Top = T > 0          ? c.crop(0,0,c.width(),T)              : NOP
    Right = R < c.width()  ? c.crop(R,T,c.width()-R,B-T)      : NOP
    Bottom = B < c.height() ? c.crop(0,B,c.width(),c.height()-B)  : NOP

    Eval("Area." + OP)
    IsClip(Left)  ? StackHorizontal(Left, Last)  : NOP
    IsClip(Right) ? StackHorizontal(Last, Right) : NOP
    IsClip(Top) ? StackVertical(Top, Last)   : NOP
    IsClip(Bottom) ? StackVertical(Last, Bottom)   : NOP
    Return Last
}

#    current_frame=n
#    fc=FrameCount()
#    fa=FrameArea(src,0,100,0,1080)

#SL="""
For (n=0,src.FrameCount-1){
    current_frame=n
#    fc=FrameCount()
#    AL=AverageLuma
    if (current_frame < FrameCount){
        if (Eval(FrameAreaS(src,0,100,0,1080,"AverageLuma"))){
        }    if (AverageLuma < 16){
        SmoothLevels(0, 1.0, 255, 16, 235).Letterbox(0,0,240,240)
        } else {
        SmoothLevels(0, 1.0, 255, 16, 235)
        }
    }
    Return Last
}
#"""
#GScriptClip(SL)

StackHorizontal(src,last)
#Return last

I have many videos with 16/9 and some 4/3 with letterbox mixed in and the levels are off. I am trying to automate the tasks by detecting the letterbox. Using FrameAreaS to 'crop' the left side of the border and get the averageluma inside the 'crop' area. Should averageluma < 16 then apply filter else different filter.

I have been messing around trying various iterations and either get "I don't know what framecount or averageluma or n means." or "invalid arguments to function framecount" or "average plane: this filter can only be used within run-time filter"

Does anyone know how to get it to work?

[johnmeyer]

I thought you got pretty good advice over in the doom9.org forum over the past week to your identical request:

Letterbox detector

Were you not able to get any of the proposed solutions to work?

[coolgit]

Nope. I am not a programmer so I can't understand where I am going wrong. StainlessS is busy.

Just came across this http://avisynth.nl/index.php/The_script_execution_model/Scope_and_lifetime_of_variables and thinking of creating another function similar to bracket_luma.