Topaz VAI is not doing any de-interlacing, it calls ffmpeg to do the de-interlacing for it using ffmpeg Bwdif. Topaz only enhance the picture/video after de-interlacing completed.
isn’t this post (1 post in this thread)?
Yes it is ffmpeg but it is bwdif which is used. The post where you explain how to deinterlace in doubling the frame rate.
if you mean in topaz, there is nothing to do/configure as this is the out of the box behavior, to double the fps.
if you mean in Hybrid, you mean this post?
I’m stupid, I didn’t see that it’s on this post where we discuss. You explain well how to deinterlace without doubling the fps
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In that case the extra frames shouldn’t make any difference. Though now I’m curious if de-interlacing it myself beforehand would give similar/same results to letting Topaz/ffmpeg do it.
If it’s just running a de-interlace from ffmpeg and then processing, why aren’t all the models available? It seems like it should be able to run them all.
in any case, deinterlacing via qtgmc remains better for me 
if you going to also use bwdif with ffmpeg, you might see the same.
it’s a very good question. the same i asked why Dione AI (e.g. Dione: DV) is not available for progressive scan video
Today I compared the results of running Iris in its various interlaced/progressive modes. The result of Iris in interlaced mode on interlaced footage is nearly identical to what I get if I de-interlace the footage in advance and run Iris in progressive mode.
It’s close enough that if I toggle between the results, I can’t see any difference at all, and if I combine them using difference mode, I get a black screen. There’s probably some micro differences between exact pixel values, but not enough to ever matter.
The only real difference is the frame rate and render time. Running it on interlaced footage gives me double the frame rate and about double the render time.
I do see a difference with “Interlaced Progressive.” The footage gets a little softer with Interlaced Progressive vs the other two. It’s not a massive difference, but I can see it clearly.
That’s Iris. I did try running the other models on the de-interlaced footage. Most of them didn’t look good. Maybe that’s why they aren’t available for interlaced footage. Proteus has some potential since I can fine tune settings. In Auto it gave some unpleasant artifacts and wasn’t usable. Maybe better settings would help. It’s worth some more experimentation.
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