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Take it easy 

I was still using a CRT 2 years ago and using SVP already. But after 10 years of heavy use the screen was no longer bright and color were washed out so after long reading about different models I opted for a dell u2311h, which are not considered to be too bad in motion blur. First day of use I was O_O because of motion blur. I never really worked with a LCD so was a big shock the first days, even looking at the mouse pointer was hard. Almost returned it but kept it after all for other advantages and no real other all around better screen in market, so I think I can tell the difference 

But what u call double image effect are the sample and hold problem on LCD screens, and it gets all blurry when u add motion blur and some overshooting from RTC, and I don't remember ever seen that problem with my old CRT. And CRT do have motion blur, just check a white square, or round, going across the screen on different speeds and u'll tell me. And it gets worse when phosphor coat gets depleted. But since they are very fast compared to LCD, beam just hit the point for a few nanoseconds, and phosphor usually emits lights for a ms or so, we can say it's virtually motion blur free.

But it's strange that u have a problem similar to the s&h problem on LCD, might be some sync problem causing some stuttering otherwise I don't see what can be the cause. For more deep test u might try pixperan, and see if u have any problem. BTW to see if the problem is more motion blur or s&h problem u can wave ur hand in front of ur eyes and spread ur fingers a little bit for adjustments. Manual black frame insertion  . For example in readability test I can get way higher. But I don't think it will do any difference with a CRT 

From experience for interlaced material the best is using only yadif 2x or bob without SVP, unless u have a 120Hz LCD, projector, or CRT capable of 90Hz and above. For the typical 50i source, using yadif 2x u will get 50p so SVP will only calculate 10 additional fps if refresh rate is 60Hz and result can be strange, so advice is not using SVP in that condition 

Also, I tested deinterlace algos for output of only 25p and used SVP to interpolate to 60fps. For movies result was interesting, might be better than yadif 2x but for sports, like football , It created too much artifacts around the ball and small players so I didn't found it worth, despite of a globally better feeling of smoothness.

Regarding deinterlace software u can also try the LAV filters, and quickly activate/deactivate between software (yadif 2x) or hardware  and see the differences. Also watch EVR output to see if u're not getting it deinterlaced twice, this problem can happen sometimes on some settings. If output is 50fps then it's ok.

For testing purposes I use this video that I got from the doom9 motion interpolation (or was it from other page?) some time ago. I uploaded from my hd since I don't remember the original link

But I don't know if there's a setting to get perfect geometry (tested but perfect perfect no way  , but latest SVP seem better    ) and if this video is good for reference as quality you'll get for "real" videos/movies.  I think so but maybe there are other situations not present in this short video.

For owners of HD 4xxx I found that the best alternative is using Potplayer for decoding with DXVA and custom EVR I tried cyberlink HAM with bitstream but I think Potplayer is faster for decoding and very important it is also free

No madvr or Haali renderer but I think you can use custom shaders like in MPC too. Check these ones from these thread to improve quality. Here I have resolution of only 720p with small screen so I don't see much difference in the renderings  but I think it can be good alternative 

I saw the new options for ffdshow raw in the ini file (explanation in russian  ), I tried it and I was able to disable the enabling of raw by SVP, but couldn't find a way that SVP enables it when launched and disabled it when exiting or leave it in the state it was.

I see that there are too options for raw, I tried to mix it but couldn't not do what I wanted. Is it possible?

Option ini better than nothing 

But the ideal i think, if it's possible, is that svp when launched always enables ffdshow raw (if launched it means we want to watch movie with smooth motion ) and when exiting svp it restores previous state of ffdshow raw, that is, if ffdshow was already enabled live it enabled but if it was disabled disable it 

Thank you for help 

So the posterize effect must switch from NV12 to YV too...

But using post-processing don't use some CPU? I'm on the limit of frame drops for some clips  I'll do some tests to see which trick is faster 

Thanks again for support,

Cheers