[mrob]

This guide recommends "yadif" as a deinterlacing filter. I find "w3fdif" looks better. Like yadif, it does not do motion tracking, so it's reasonably fast and avoids the distracting artifacts that motion tracking sometimes causes (I'd rather have consistently mediocre results than sometimes great and sometimes bad), but it considers three fields at a time instead of yadif's two, which lets it hide the interlacing artifacts better.

[brucethemoose2]

There is an extension of that: https://github.com/HomeOfVapourSynthEvolution/VapourSynth-Bw...

Though if you are reencoding, you mind as well go whole hog and use QTGMC.

[Trixter]

As previously suggested, w3fdif has mostly been supplanted by bwdif. w3fdif can produce shimmering, whereas yadif does not, which is why bwdif operates like yadif but uses the better field matching of w3fdif.

[kierank]

"bwdif" is a hybrid of "yadif" and "w3fdif"