[Help] Correct Bad Frame Rate Conversion

[zoidberg]

60i to 50i seems to be exactly the case here, Its a making of featurette on a PAL DVD I de-interlace the 50i to 25p progressive and I see the frame blending.I figured it was pretty burnt in and would need some wizadry

Is there a chance the featurette was included on an NTSC release? You'd be surprised how cheaply you can get older DVDs on eBay these days (assuming it's not some super rare title).
You will definitely see the blending when deinterlacing to 25p. Try 🔍SeparateFields:

Code:

separatefields()

This will split the frames into fields (and double the frame count/frame rate)