VideoHelp Forum




+ Reply to Thread
Results 1 to 9 of 9
  1. Hello there!

    I am trying to restore a scene that has some kind of aliasing I would describe as 'upscaling with Nearest-neighbor gone bad' type of aliasing.

    Please take a look at this still:

    and the very next frame:


    the little steppy-steps sort of move through the frame.
    It is present within the while video, which has 640x480 to begin with.

    I've tried anti-aliasing with a bunch of tools, also including avisynth santiag() but had no luck.

    Any Idea on how to revert this?

    Thanks!
    Quote Quote  
  2. It looks like the video was poorly deinterlaced. And maybe poorly scaled too. You should upload a short unprocessed, not re-encoded, sample for proper analysis.
    Quote Quote  
  3. Originally Posted by jagabo View Post
    It looks like the video was poorly deinterlaced. And maybe poorly scaled too. You should upload a short unprocessed, not re-encoded, sample for proper analysis.
    Ah, interesting! That never crossed my mind

    I have attached an unprocessed sample for you good Sir/Madam.
    You can notice the aliasing in the hair of the blonde lady as well in this short excerpt

    I've also noticed the file has 29.976 fps while running TFM(), tdecimate() will return it to 23,976 frames.
    Image Attached Files
    Quote Quote  
  4. qtgmc mode=2 or mode=3 and incresing TR0-2 should help
    users currently on my ignore list: deadrats, Stears555, marcorocchini
    Quote Quote  
  5. Originally Posted by Selur View Post
    qtgmc mode=2 or mode=3 and incresing TR0-2 should help
    Thank you! I am currently experimenting with

    Code:
    video=QTGMC(video,Preset="Slow",FPSDivisor=2,ShutterBlur=3, TR2=3, EdiThreads=8)
    this impoves it quite alot but does not completely remove the artifacts.

    Which mode-setting do you mean? I was unable to find a paramater "mode" in the documentation.
    Quote Quote  
  6. Sorry, mode => InputType
    (completely removing the effect might not be possible)
    users currently on my ignore list: deadrats, Stears555, marcorocchini
    Quote Quote  
  7. You won't find any perfect fix. Try something like:

    Code:
    LWLibavVideoSource("aliasing.mkv") 
    TDecimate(Cycle=5, CycleR=1)
    QTGMC(InputType=2)
    Image Attached Files
    Quote Quote  
  8. Adding Santiag(strh=2, strv=2, nns=4) between TDecimate and QTGMC reduces the twitter a bit more but blurs a bit.
    Quote Quote  
  9. Ah, I see! Thanks!

    Vielen Dank, der Herr! Das war sehr hilfreich!

    Code:
    video=QTGMC(video,Preset="placebo",InputType=3, ProgSADMask=0.0,TR2=3
    returns a rather decent result. It's not gone completely but really useable. <3


    THANK YOU ALL for your valuable Input!
    Last edited by DReffects; 28th Oct 2023 at 09:13.
    Quote Quote  



Similar Threads

Visit our sponsor! Try DVDFab and backup Blu-rays!