[Warner306]

 i use madVR with FULL Group Profiles and Profiles within the groups. this gives me pretty much full control within madVR for each video content type.

there are only two types of content that give me headaches, the first being HDR 4K due to the nits values and very old DVD's that are very poor quality dating back to pretty much when DVD first came out.

if i could set different profiles that were dependant on media PQ then it would make life a lot easier and this is what i'm trying to achieve.

a little question that i'm also confused about. with me being in the UK are all my DVD's classed as PAL?   

And, yes, I would assume all of your DVDs are PAL in the UK. They should be 25 fps rather than 23.976 fps.   

 that would be 25hz to 50hz though would it not or am i thinking about TV broadcast interlaced?

just like NTFS is 60hz so their DVD format is 30hz?  

Don't have any more than one DVD to know how they are interpreted by a modern video renderer. Here are the specs from my set up manual:

DVD:

• Resolution: 720 x 480 -> 720 x 576
  
• Frame rate: 24/25 fps -> 29.97 fps
  
• Signal Type: interlaced
  
• Codec: MPEG-2 (H.262), MPEG-1
  
• Color Space: Y'CbCr Limited (16-235)
  
• Chroma Subsampling: 4:2:0
  
• Bit depth: 8-bits (per color)
  
• Primaries: Rec. 601 (EBU/PAL/SMPTE-C)
  
• Peak Luminance: 100 nits
  

I am pretty sure madVR decimates the 29.97 interlaced source and makes it into 23.976 fps. PAL DVDs, on the other hand, they must be converted from 25 fps interlaced to 50 fps progressive. So one does inverse telecine, the other does regular deinterlacing. I could be wrong, though.