VideoHelp Forum

Try DVDFab and download streaming video, copy, convert or make Blu-rays,DVDs! Download free trial !
+ Reply to Thread
Page 3 of 13
FirstFirst 1 2 3 4 5 ... LastLast
Results 61 to 90 of 390
Thread
  1. Originally Posted by sanlyn View Post
    The banding is more obvious when it's played. Sometimes a still shot doesn't show it so well. I don't know why.
    Because your eyes are more sensitive to motion than detail.
    Quote Quote  
  2. Originally Posted by x264 View Post
    SMdegrain is killing the details in the dark scenes
    http://screenshotcomparison.com/comparison/19807
    When the amplitude of the noise approaches the signal level, or conversely, when the signal level drops to the level of the noise, the filter can't tell the difference between signal and noise.
    Quote Quote  
  3. Very familiar. This video is discussed several times on Doom9. The banding is more obvious when it's played. Sometimes a still shot doesn't show it so well. I don't know why.
    The one which was discussed on Doom9 is the R1 release. The DVD's i'm having is the R2J release which is much better compared to the R1.
    Quote Quote  
  4. Originally Posted by jagabo View Post
    Originally Posted by x264 View Post
    SMdegrain is killing the details in the dark scenes
    http://screenshotcomparison.com/comparison/19807
    When the amplitude of the noise approaches the signal level, or conversely, when the signal level drops to the level of the noise, the filter can't tell the difference between signal and noise.
    I don't understand, can you explain in layman's terms?
    Quote Quote  
  5. The IVTC'd video flickers when in motion, which filter should i use to fix this issue?
    Quote Quote  
  6. Originally Posted by x264 View Post
    The IVTC'd video flickers when in motion, which filter should i use to fix this issue?

    Can you be more specific ?

    What kind of flicker ? Luminance flicker ? aliasing flicker ? noise flicker?

    After IVTC only , or other filters applied ?
    Quote Quote  
  7. should i use psy-trellis for anime?
    Last edited by x264; 21st Apr 2013 at 08:10.
    Quote Quote  
  8. Originally Posted by x264 View Post
    should i use psy-trellis for anime?

    You can do whatever you want . Try encoding a few samples at the same bitrate and vary the settings of psy-trellis

    In general I tend to not use it, or very low amounts - it tends to make edges "noisy". But in a grain or dither retaining situation you usually have to make compromises
    Quote Quote  
  9. Originally Posted by x264 View Post
    Originally Posted by jagabo View Post
    Originally Posted by x264 View Post
    SMdegrain is killing the details in the dark scenes
    http://screenshotcomparison.com/comparison/19807
    When the amplitude of the noise approaches the signal level, or conversely, when the signal level drops to the level of the noise, the filter can't tell the difference between signal and noise.
    I don't understand, can you explain in layman's terms?
    If there's more noise than picture removing the noise will remove the picture.
    Quote Quote  
  10. How do i apply a mask to prevent the dark scene's from being oversmoothed? could any of you post the code for this process?
    Quote Quote  
  11. See my post and poisondeathray's post immediately after:

    https://forum.videohelp.com/threads/355377-Interlacing-problem?p=2235689&viewfull=1#post2235689

    That allows you to filter differently based on brightness.

    Or you can use Trim() or ApplyRange() to apply different filters to different ranges of frames.
    Quote Quote  
  12. In MeGUI there is an option for setting quantizer matrice, what should i use for this option?
    Quote Quote  
  13. Originally Posted by x264 View Post
    In MeGUI there is an option for setting quantizer matrice, what should i use for this option?

    These are for custom quantizer matrices (CQM's) . Use search if you want more info

    People don't use this anymore, except in very specific situations. They've been largely surpassed by using AQ modes
    Quote Quote  
  14. Could you name some of the best postprocessing filters?(to be used with TIVTC(clip2="postprocessingfilter")?, also should i set PP=0 when using an external PP filter?
    Quote Quote  
  15. Originally Posted by x264 View Post
    Could you name some of the best postprocessing filters?(to be used with TIVTC(clip2="postprocessingfilter")?, also should i set PP=0 when using an external PP filter?
    PP=0 turns it off completely = no post processing . It's often used when tweaking the settings with display=true. You need to adjust the combing threshold for clip2

    Have a look at the documentation and instructions for examples on how to tweak the settings

    For clip2 , QTGMC.SelectEven() usually gives good results (at least better than the default, when combing is detected)
    Quote Quote  
  16. I found this in the qtgmc thread

    Although I know a number of people use it with success, QTGMC is not really designed for anime. QTGMC relies on identifying the motion from frame to frame. With a film source the frame rate is fairly high and movements between frames are usually small; the detail of film means good matches can often be found. Anime will run at a lower rate, may contain duplicate frames, have stylized/artificial movement, and be hard to track if there is a lack of fine detail. So motion matches on anime can be poor, which will lead to ghosting on the temporal steps of the algorithm (and possible blurring / halo strengthening). The same problems can apply to game captures to a lesser extent. --Vit
    Quote Quote  
  17. Originally Posted by x264 View Post
    I found this in the qtgmc thread

    Although I know a number of people use it with success, QTGMC is not really designed for anime. QTGMC relies on identifying the motion from frame to frame. With a film source the frame rate is fairly high and movements between frames are usually small; the detail of film means good matches can often be found. Anime will run at a lower rate, may contain duplicate frames, have stylized/artificial movement, and be hard to track if there is a lack of fine detail. So motion matches on anime can be poor, which will lead to ghosting on the temporal steps of the algorithm (and possible blurring / halo strengthening). The same problems can apply to game captures to a lesser extent. --Vit

    This is true, QTGMC isn't recommended for deblending either for the some of the same reasons like temporal ghosting issues - but it's still commonly used .

    Nevertheless, it still produces better results than other filters with clip2 I would say most of the time, even on anime

    Of course YMMV and it varies by source, so try some others out if it's not giving the results you want
    Quote Quote  
  18. So when i set clip2=QTGMC(), the function will replace the combed frames with the deinterlaced frames from QTGMC. When using the clip2 parameter should i set PP=1(find/hint combed frames but don't deinterlace)?
    Quote Quote  
  19. Originally Posted by x264 View Post
    So when i set clip2=QTGMC(), the function will replace the combed frames with the deinterlaced frames from QTGMC. When using the clip2 parameter should i set PP=1?

    QTGMC will return too many frames, you need selectodd or even

    clip2 only works with higher PP modes, I can't remember which ones, it says in the instructions . But it works with default PP value for sure

    It will replace only those which are detected as combed according to the threshold settings (this is why you need to tweak the settings using display=true)
    Quote Quote  
  20. QTGMC will return too many frames, you need selectodd or even
    The official doc. of qtgmc shows this > QTGMC().selecteven() < for same framerate.

    It will replace only those which are detected as combed according to the threshold settings (this is why you need to tweak the settings using display=true)
    Which all options do i need to tweak?

    5 - motion-adaptive blend deinterlacing
    6 - motion-adaptive cubic interpolation deinterlacing
    7 - motion-adaptive modified-ela deinterlacing
    Which of these modes should i use?
    Quote Quote  
  21. Use the ones that work better on your specific source
    Quote Quote  
  22. Originally Posted by poisondeathray View Post
    Use the ones that work better on your specific source
    I don't know the difference between the 3 PP modes.
    Quote Quote  
  23. Originally Posted by x264 View Post
    Originally Posted by poisondeathray View Post
    Use the ones that work better on your specific source
    I don't know the difference between the 3 PP modes.
    I usually leave it at default (PP=6)

    The modes 5-7 do replacement pixels using the mask where combing is detected, not the entire frame , but if you specify clip2, it doesn't matter because the method e.g. blend vs cubic etc... isn't used , instead clip2 is used

    But when you don't use clip 2,

    PP=5 Blend deinterlaing is bad. It makes everything blurry
    PP=6 Cubic. this is almost the same thing as bob(). Leaves aliasing artifacts on orphaned fields, or combing areas
    PP=7 Don't know never use it





    clip2 -

    When using PP > 1 this parameter may be used to specify a clip to take deinterlaced
    frames from instead of using one of TFM's inbuilt deinterlacing methods. If PP < 5
    then frames will be taken as is from clip2, if PP >= 5 (i.e. using motion adaptation)
    then TFM will build the mask as usual and only pixels in moving areas will be taken
    from the frames in clip2. Don't specify anything for clip2 to use TFM's internal
    deinterlacing. For an example of using clip2 see the clip2_sample_avs.avs file.
    Quote Quote  
  24. TFM(d2v="C:\Users\Abhijith Nair\Desktop\Death Note\OP\MainMovie\Desktop\VTS_01_1.d2v", slow=2, display=true, clip2=QTGMC(preset="placebo").selecteven( ) ).Tdecimate(mode=1)
    this is what i came up with do you think any option needs to be changed?

    You said that i tweak some settings using display=true, name those options?
    Last edited by x264; 22nd Apr 2013 at 11:24.
    Quote Quote  
  25. Originally Posted by x264 View Post
    TFM(d2v="C:\Users\Abhijith Nair\Desktop\Death Note\OP\MainMovie\Desktop\VTS_01_1.d2v", slow=2, display=true, clip2=QTGMC(preset="placebo").selecteven( ) ).Tdecimate(mode=1)
    this is what i came up with do you think any things needs to be changed?
    display=true will hardcode the overlay if you leave it in there, you only use that for debugging and tweaking purposes while adjusting the combing threshold and other settings (remove it before encoding)

    Then you use adjust the settings to deliver the results you want
    Quote Quote  
  26. preset=placebo is probably a waste of time.
    Quote Quote  
  27. Is it safe to use low cthresh values?
    Last edited by x264; 22nd Apr 2013 at 11:29.
    Quote Quote  
  28. It's not detected as combed with the settings you are using. Notice the overlay says "clean frame" . Display will say "combing detected, deinterlaced" or something like that when it applies the PP clip2 . So adjust the comb detection threshold settings until it is detected. Then go back over other sections to make sure there aren't false positives (you don't want to deinterlace "good" sections)
    Quote Quote  
  29. and what if there are false-positives? how do i prevent qtgmc from deinterlacing the good frames?. I had to lower the cthresh value to 2 so that a combed frame would be deinterlaced, but now the previous good frames are also being deinterlaced.
    Quote Quote  
  30. Originally Posted by x264 View Post
    and what if there are false-positives? how do i prevent qtgmc from deinterlacing the good frames?

    You adjust the settings until it says "clean frame" instead of "combing detected"
    Quote Quote  



Similar Threads