Frame-by-frame combing detection in AviSynth

[ZetaStax]

I'm trying to find a way to run a combing detection algorithm through AviSynth. I know of two functions that could be used Decomb/IsCombed and TIVTC/IsCombedTIVTC. Has anyone experience with those functions and knows if one is more accurate than the other?

Now I'd like to run this function on every frame and output a log that would say something like "combing from frame X to Y" every time combing is detected. The algorithm would be as follow

bool combingFound := false
for-each frame in clip {
   if isCombed(frame) {
      if !combingFound {
         combingFound := true
         startFrame := frame
      }
   } else {
      if combingFound {
         combingFound := false
         writeLog("Combing from " + startFrame + " to " + frame)
      }
   }
}

I'm not sure how to write that in AviSynth unfortunately. I've also found this script

<input>
global unused_ = blankclip(pixel_type="yv12", length=10).TFM()
file="<temporary-file.log>"
global sep="-"
function IsMoving()
{
  global b = (diff < 1.0) ? false : true
}
c = SelectRangeEvery(every=<every>,length=<length>)
global clip = c
c = WriteFile(c, file, "a", "sep", "b")
c = FrameEvaluate(c, "global a = IsCombedTIVTC(clip, cthresh=9)")
c = FrameEvaluate(c, "IsMoving")
c = FrameEvaluate(c,"global diff = 0.50*YDifferenceFromPrevious(clip) + 0.25*UDifferenceFromPrevious(clip) + 0.25*VDifferenceFromPrevious(clip)")
crop(c,0,0,16,16)

From http://avisynth.nl/index.php/Interlace_detection but I don't understand how to interpret the results. It looks like the log needs to be fed to something else for interpretation. I've tried using the standalone but I'm getting an error trying to run it on a script.

[LigH.de]

What are you trying to achieve what no one else before you ever tried? Don't reinvent the wheel, especially not with only little insight in all the possible reasons why they go more or less round. A really elaborate algorithm to detect interlacing or telecine will not only look at one frame separately, it would compare several fields instead.

[jagabo]

Something as simple as

colon = ": "
WriteFile("CombInfo.txt", "current_frame", "colon", "IsCombedTIVTC(last, cthresh=9)", flush=true)

will give you a file with one line of text for each frame -- with frame number and true/false (true=combed, false=not). For example:

0: false
1: false
2: false
3: true
4: true
5: false
6: false

[ZetaStax]

Thank you jagabo, this will do the trick! I can easily write a script to parse those results.