Benefits of second pass enhancement

I’ve had some time to experiment with 3.4.4.
My workflow has been to use Hybrid with QTGMC to deinterlace, using none of the filters except placebo. Video Enhance uses a different method with bwdif which is inferior, as it has more noise and combing. My problem with using Iris and deinterlacing fields in VE is the facial recognition can be too strong. Now we have the Second Pass Enhancement it’s possible to use Proteus for the first iteration, with Improve Detail that counters the softening, then Iris in the second pass ( keep to 1x scaling to avoid artefacts). With the Recover Original Details setting you can bring back the character of the original with the benefits of Iris which does a great job on edges and skin. So I think this has been a very good update. I’ve found VE is better in 4k mode, seems faster and adds more detail. In general this update seems to be faster for Apple Silicon. Thanks Topaz for great work.If you could only incorporate QTGMC for deinterlace, then it could be even better.

My settings using SD video converted in Hybrid with QTMGC ( each field to frame).
Convert to 4k, 50fps
Revert Compression 28
Improve Detail 25
Sharpen 3
Reduce Noise 27
Dehalo 22
AA/Deblur -34
Recover detail 9
2nd Pass
Scale 1x
Revert Comp 68
Improve Detail 22
Sharpen 15
Reduce noise 3
Dehalo 30
AA Deblur 3
Recover Orig detail 60

QTGMC would be great… but I don’t know how feasible it is to include it, since it is a plugin for Avisynth/Vapoursynth… which are not natively supported by TVAI.

I also agree though, and it would be great if the developers could implement it!

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You can do this now - but it requires rolling your own ffmpeg build with both topaz and avisyth supports. It’s not easy, but it can be done. I don’t see topaz distributing it themselves (or anyone else for that matter) as it requires the use of two incompatible licenses.

I’ve been experimenting a bit with deinterlacing. I wasn’t happy with the results of Iris on upscale and deinterlace, so I tried bwdif + Dione Interlaced TV v4 instead at 1x (576i source) which I then cropped and stretched to 4:3 with a 1:1 pixel ratio, and then upscaled to HD with Iris v2. It turned out pretty well. At least for that specific source.

I’m not sure the second pass can do this as I had to put the crop between the two enhancements, otherwise I got a lot of tearing in scenes with a lot of movement.

Deinterlacing is best done with Hybrid as Dione is very noisy. I haven’t tried NYX and then Deinterlacing with Dione on second pass. Good to convert to square pixels at that stage. Might give it a try with Dione second pass. As you say it depends on source.